Tramadol Hydrochloride Extended-Release

6 ADVERSE REACTIONS The following serious or otherwise important adverse reactions are described in greater detail, in other sections: Addiction, Abuse, and Misuse [ see Warnings and Precautions (5.1) ] Life-Threatening Respiratory Depression [ see Warnings and Precautions (5.3) ] Ultra-Rapid Metabolism of Tramadol and Other Risk Factors for Life-Threatening Respiratory Depression in Children [ see Warnings and Precautions (5.4) ] Neonatal Opioid Withdrawal Syndrome [ see Warnings and Precautions (5.5) ] Interactions with Benzodiazepines and Other CNS Depressants [ see Warnings and Precautions (5.7) ] Serotonin Syndrome [ see Warnings and Precautions (5.8) ] Seizures [ see Warnings and Precautions (5.9) ] Suicide [ see Warnings and Precautions (5.10) ] Adrenal Insufficiency [ see Warnings and Precautions (5.11) ] Severe Hypotension [ see Warnings and Precautions (5.13) ] Gastrointestinal Adverse Reactions [ see Warnings and Precautions (5.15) ] Hypersensitivity Reactions [ see Warnings and Precautions (5.16) ] Withdrawal [ see Warnings and Precautions (5.17) ] Most common adverse reactions (incidence ≥10% and twice placebo) are nausea, constipation, dry mouth, somnolence, dizziness, and vomiting. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Trigen Laboratories, LLC at 1-877-482-3788 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Tramadol Hydrochloride Extended-Release Capsules were administered to a total of 1987 patients in clinical trials. These included four double-blind and one long-term, open-label study in patients with osteoarthritis of the hip and knee. A total of 812 patients were 65 years or older. Adverse reactions with doses from 100 mg to 300 mg in the four pooled, randomized, double-blind, placebo-controlled studies in patients with chronic non-malignant pain are presented in the following table (see Table 1 ). Table 1: Incidence (%) of Patients with Adverse Reaction Rates ≥ 5% from Four Double-Blind, Placebo-Controlled Studies in Patients with Moderate to Moderately Severe Chronic Pain by Dose (N=1917) Tramadol Hydrochloride Extended-Release Capsules Placebo Preferred Term 100 mg (N=429) n (%) 200 mg (N=434) n (%) 300 mg (N=1054) n (%) (N=646) n (%) Headache 99 (23.1) 96 (22.1) 200 (19.0) 128 (19.8) Nausea 69 (16.1) 93 (21.4) 265 (25.1) 37 (5.7) Somnolence 50 (11.7) 60 (13.8) 170 (16.1) 26 (4.0) Dizziness 41 (9.6) 54 (12.4) 143 (13.6) 31 (4.8) Constipation 40 (9.3) 59 (13.6) 225 (21.3) 27 (4.2) Vomiting 28 (6.5) 45 (10.4) 98 (9.3) 12 (1.9) Arthralgia 23 (5.4) 20 (4.6) 53 (5.0) 33 (5.1) Dry Mouth 20 (4.7) 36 (8.3) 138 (13.1) 22 (3.4) Sweating 18 (4.2) 23 (5.3) 71 (6.7) 4 (0.6) Asthenia 15 (3.5) 26 (6.0) 91 (8.6) 17 (2.6) Pruritus 13 (3.0) 25 (5.8) 77 (7.3) 12 (1.9) Anorexia 9 (2.1) 23 (5.3) 60 (5.7) 1 (0.2) Insomnia 9 (2.1) 9 (2.1) 53 (5.0) 11 (1.7) The following adverse reactions were reported from all chronic pain studies (N=1917). The lists below include adverse reactions not otherwise noted in Table 1. Adverse reactions with incidence rates of 1.0% to <5.0% Cardiac disorders: hypertension Gastrointestinal disorders: dyspepsia, flatulence General disorders: abdominal pain, accidental injury, chills, fever, flu syndrome, neck pain, pelvic pain Investigations: hyperglycemia, urine abnormality Metabolism and nutrition disorders: peripheral edema, weight loss Musculoskeletal, connective tissue and bone disorders: myalgia Nervous system disorders: paresthesia, tremor, withdrawal syndrome Psychiatric disorders: agitation, anxiety, apathy, confusion, depersonalization, depression, euphoria, nervousness Respiratory, thoracic and mediastinal disorders: bronchitis, pharyngitis, rhinitis, sinusitis Skin and subcutaneous tissue disorders: rash Urogenital disorders: prostatic disorder, urinary tract infection Vascular disorders: vasodilatation Adverse reactions with incidence rates of 0.5% to <1.0% at any dose and serious adverse reactions reported in at least two patients Cardiac disorders: EKG abnormal, hypotension, tachycardia Gastrointestinal disorders: gastroenteritis General disorders: neck rigidity, viral infection Hematologic/Lymphatic disorders: anemia, ecchymoses Metabolism and nutrition disorders: blood urea nitrogen increased, GGT increased, gout, SGPT increased Musculoskeletal disorders: arthritis, arthrosis, joint disorder, leg cramps Nervous system disorders: emotional lability, hyperkinesia, hypertonia, thinking abnormal, twitching, vertigo Respiratory disorders: pneumonia Skin and subcutaneous tissue disorders: hair disorder, skin disorder, urticaria Special Senses: eye disorder, lacrimation disorder Urogenital disorders: cystitis, dysuria, sexual function abnormality, urinary retention 6.2 Postmarketing Experience The following adverse reactions have been identified during post approval use of tramadol. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Serotonin syndrome : Cases of serotonin syndrome, a potentially life-threatening condition, have been reported during concomitant use of opioids with serotonergic drugs. Adrenal insufficiency : Cases of adrenal insufficiency have been reported with opioid use, more often following greater than one month of use. Anaphylaxis : Anaphylaxis has been reported with ingredients contained in Tramadol Hydrochloride Extended-Release Capsules. Androgen deficiency : Cases of androgen deficiency have occurred with chronic use of opioids [ see Clinical Pharmacology (12.2) ]. QT prolongation/torsade de pointes: Cases of QT prolongation and/or torsade de pointes have been reported with tramadol use. Many of these cases were reported in patients taking another drug labeled for QT prolongation, in patients with a risk factor for QT prolongation (e.g., hypokalemia), or in overdose setting. Metabolism and nutrition disorders Hyponatremia: Cases of severe hyponatremia and/or SIADH have been reported in patients taking tramadol, most often in females over the age of 65, and within the first week of therapy [ see Warnings and Precautions (5.19) ]. Hypoglycemia: Cases of hypoglycemia have been reported in patients taking tramadol. Most reports were in patients with predisposing risk factors, including diabetes or renal insufficiency, or in elderly patients [ see Warnings and Precautions (5.20) ].

4 CONTRAINDICATIONS Tramadol Hydrochloride Extended-Release Capsules are contraindicated for: all children younger than 12 years of age [ see Warnings and Precautions (5.4) ] post-operative management in children younger than 18 years of age following tonsillectomy and/or adenoidectomy [ see Warnings and Precautions (5.4) ] Tramadol Hydrochloride Extended-Release Capsules are also contraindicated in patients with: Significant respiratory depression [ see Warnings and Precautions (5.3) ] Acute or severe bronchial asthma in an unmonitored setting or in the absence of resuscitative equipment [ see Warnings and Precautions (5.12) ] Known or suspected gastrointestinal obstruction, including paralytic ileus [ see Warnings and Precautions (5.15) ] Hypersensitivity to tramadol (e.g., anaphylaxis) [ see Warnings and Precautions (5.16) , Adverse Reactions (6) ] Concurrent use of monoamine oxidase inhibitors (MAOIs) or use within the last 14 days [ see Drug Interactions (7) ] Children younger than 12 years of age. ( 4 ) Postoperative management in children younger than 18 years of age following tonsillectomy and/or adenoidectomy. ( 4 ) Significant respiratory depression. ( 4 ) Acute or severe bronchial asthma in an unmonitored setting or in absence of resuscitative equipment. ( 4 ) Known or suspected gastrointestinal obstruction, including paralytic ileus. ( 4 ) Hypersensitivity to tramadol. ( 4 ) Concurrent use of monoamine oxidase inhibitors (MAOIs) or use within the last 14 days. ( 4 )

11 DESCRIPTION Tramadol Hydrochloride Extended-Release Capsules are an opioid agonist in an extended-release oral formulation. The chemical name for tramadol hydrochloride USP is (±) cis- 2-[(dimethylamino)methyl]-1-(3-methoxyphenyl) cyclohexanol hydrochloride. Its structural formula is: Figure 1 C 16 H 25 NO 2 ∙ HCl The molecular weight of tramadol hydrochloride USP is 299.8. It is a white, bitter, crystalline and odorless powder that is readily soluble in water and ethanol and has a pKa of 9.41. The n-octanol/water log partition coefficient (logP) is 1.35 at pH 7. Tramadol Hydrochloride Extended-Release Capsules contain a total dose of tramadol hydrochloride 100, 200, and 300 mg in a combination of immediate-release and extended-release components. Dosage Immediate-release Extended-release 100 mg 25 mg 75 mg 200 mg 50 mg 150 mg 300 mg 50 mg 250 mg Tramadol Hydrochloride Extended-Release Capsules are white in color. Inactive ingredients include gelatin, titanium dioxide, shellac, FD & C Blue #2 aluminum lake (E132) (100 and 200 mg capsules), D & C Red #7 calcium lake (E180) (200 and 300 mg capsules), D & C Yellow #10 aluminum lake (300 mg capsule), lactose monohydrate 200 mesh, microcrystalline cellulose, povidone K30, corn starch, sodium starch glycolate, magnesium stearate, sucrose stearate, hypromellose, talc, polysorbate 80, Eudragit NE 30D, and simethicone emulsion. Chemical Structure

2 DOSAGE AND ADMINISTRATION To be prescribed only by healthcare providers knowledgeable in use of potent opioids for management of chronic pain. ( 2.1 ) Use the lowest effective dosage for the shortest duration consistent with individual patient treatment goals. ( 2.1 ) Individualize dosing based on the severity of pain, patient response, prior analgesic experience, and risk factors for addiction, abuse, and misuse. ( 2.1 ) Do not exceed a daily dose of 300 mg tramadol. Do not use with other tramadol products. ( 2.1 ) Discuss availability of naloxone with the patient and caregiver and assess each patient's need for access to naloxone, both when initiating and renewing treatment with Tramadol Hydrochloride Extended-Release Capsules. Consider prescribing naloxone based on the patient's risk factors for overdose. ( 2.2 , 5.1 , 5.3 , 5.7 ) For opioid-naïve and opioid non-tolerant patients: Initiate Tramadol Hydrochloride Extended-Release Capsules at a dose of 100 mg once daily, then titrate up by 100 mg increments every 5 days according to need and tolerance. ( 2.3 ) For patients currently on tramadol IR: Calculate total 24-hr IR dose, and initiate Tramadol Hydrochloride Extended-Release Capsules at a dose rounded down to next lower 100 mg increment; then adjust dose according to need and tolerance. See full prescribing information for instructions on conversion, titration, and maintenance of therapy. ( 2.3 , 2.4 ) Do not abruptly discontinue Tramadol Hydrochloride Extended-Release Capsules in a physically-dependent patient because rapid discontinuation of opioid analgesics has resulted in serious withdrawal symptoms, uncontrolled pain, and suicide. ( 2.5 ) 2.1 Important Dosage and Administration Instructions Tramadol Hydrochloride Extended-Release Capsules should be prescribed only by healthcare professionals who are knowledgeable in the use of potent opioids for the management of chronic pain. Do not use Tramadol Hydrochloride Extended-Release Capsules concomitantly with other tramadol products [ see Warnings and Precautions (5.6) , (5.14) ] . Do not administer Tramadol Hydrochloride Extended-Release Capsules at a dose exceeding 300 mg per day. Use the lowest effective dosage for the shortest duration consistent with individual patient treatment goals [ see Warnings and Precautions (5) ]. Initiate the dosing regimen for each patient individually, taking into account the patient's severity of pain, patient response, prior analgesic treatment experience, and risk factors for addiction, abuse, and misuse [ see Warnings and Precautions (5.1) ] . Monitor patients closely for respiratory depression, especially within the first 24-72 hours of initiating therapy and following dosage increases with Tramadol Hydrochloride Extended-Release Capsules and adjust the dosage accordingly [ see Warnings and Precautions (5.3) ]. Instruct patients to swallow Tramadol Hydrochloride Extended-Release Capsules whole [ see Patient Counseling Information (17) ] , and to take it with liquid. Breaking, chewing, splitting, or dissolving Tramadol Hydrochloride Extended-Release Capsules will result in uncontrolled delivery of tramadol and can lead to overdose or death [ see Warnings and Precautions (5.1) ]. Tramadol Hydrochloride Extended-Release Capsules may be taken without regard to food. It is recommended that Tramadol Hydrochloride Extended-Release Capsules be taken in a consistent manner [ see Clinical Pharmacology (12.3) ]. 2.2 Patient Access to Naloxone for the Emergency Treatment of Opioid Overdose Discuss the availability of naloxone for the emergency treatment of opioid overdose with the patient and caregiver and assess the potential need for access to naloxone, both when initiating and renewing treatment with Tramadol Hydrochloride Extended-Release Capsules [ see Warnings and Precautions (5.3) , Patient Counseling Information (17) ]. Inform patients and caregivers about the various ways to obtain naloxone as permitted by individual state naloxone dispensing and prescribing requirements or guidelines (e.g., by prescription, directly from a pharmacist, or as part of community-based program). Consider prescribing naloxone, based on the patient's risk factors for overdose, such as concomitant use of CNS depressants, a history of opioid use disorder, or prior opioid overdose. The presence of risk factors for overdose should not prevent the proper management of pain in any given patient [ see Warnings and Precautions (5.1 , 5.3 , 5.7) ]. Consider prescribing naloxone if the patient has household members (including children) or other close contacts at risk for accidental ingestion or overdose. 2.3 Initial Dosage Patients Not Currently on a Tramadol Product The initial dose of Tramadol Hydrochloride Extended-Release Capsules is 100 mg once daily. Patients Currently on Tramadol Immediate-Release (IR) Products Calculate the 24-hour tramadol IR dose and initiate a total daily dose of Tramadol Hydrochloride Extended-Release Capsules rounded down to the next lowest 100 mg increment. The dose may subsequently be individualized according to patient need. Due to limitations in flexibility of dose selection with Tramadol Hydrochloride Extended-Release Capsules, some patients maintained on tramadol IR products may not be able to convert to Tramadol Hydrochloride Extended-Release Capsules. Conversion from Other Opioids to Tramadol Hydrochloride Extended-Release Capsules Discontinue all other around-the-clock opioid drugs when Tramadol Hydrochloride Extended-Release Capsules therapy is initiated. There are no established conversion ratios for conversion from other opioids to Tramadol Hydrochloride Extended-Release Capsules defined by clinical trials. Initiate dosing using Tramadol Hydrochloride Extended-Release Capsules 100 mg once a day. 2.4 Titration and Maintenance Therapy Individually titrate Tramadol Hydrochloride Extended-Release Capsules by 100 mg every five days to a dose that provides adequate analgesia and minimizes adverse reactions. The maximum daily dose of Tramadol Hydrochloride Extended-Release Capsules is 300 mg per day. Continually reevaluate patients receiving Tramadol Hydrochloride Extended-Release Capsules to assess the maintenance of pain control and the relative incidence of adverse reactions, as well as monitoring for the development of addiction, abuse, or misuse [ see Warnings and Precautions (5.1) ]. Frequent communication is important among the prescriber, other members of the healthcare team, the patient, and the caregiver/family during periods of changing analgesic requirements, including initial titration. During chronic therapy, periodically reassess the continued need for the use of opioid analgesics. Patients who experience breakthrough pain may require a dosage adjustment of Tramadol Hydrochloride Extended-Release Capsules, or may need rescue medication with an appropriate dose of an immediate-release analgesic. If the level of pain increases after dosage stabilization, attempt to identify the source of increased pain before increasing the Tramadol Hydrochloride Extended-Release Capsules dosage. If unacceptable opioid-related adverse reactions are observed, consider reducing the dosage. Adjust the dosage to obtain an appropriate balance between management of pain and opioid-related adverse reactions. 2.5 Safe Reduction or Discontinuation of Tramadol Hydrochloride Extended-Release Capsules Do not abruptly discontinue Tramadol Hydrochloride Extended-Release Capsules in patients who may be physically dependent on opioids. Rapid discontinuation of opioid analgesics in patients who are physically dependent on opioids has resulted in serious withdrawal symptoms, uncontrolled pain, and suicide. Rapid discontinuation has also been associated with attempts to find other sources of opioid analgesics, which may be confused with drug-seeking for abuse. Patients may also attempt to treat their pain or withdrawal symptoms with illicit opioids, such as heroin, and other substances. When a decision has been made to decrease the dose or discontinue therapy in an opioid-dependent patient taking Tramadol Hydrochloride Extended-Release Capsules, there are a variety of factors that should be considered, including the dose of Tramadol Hydrochloride Extended-Release Capsules the patient has been taking, the duration of treatment, the type of pain being treated, and the physical and psychological attributes of the patient. It is important to ensure ongoing care of the patient and to agree on an appropriate tapering schedule and follow-up plan so that patient and provider goals and expectations are clear and realistic. When opioid analgesics are being discontinued due to a suspected substance use disorder, evaluate and treat the patient, or refer for evaluation and treatment of the substance use disorder. Treatment should include evidence-based approaches, such as medication assisted treatment of opioid use disorder. Complex patients with comorbid pain and substance use disorders may benefit from referral to a specialist. There are no standard opioid tapering schedules that are suitable for all patients. Good clinical practice dictates a patient-specific plan to taper the dose of the opioid gradually. For patients on Tramadol Hydrochloride Extended-Release Capsules who are physically opioid-dependent, initiate the taper by a small enough increment (e.g., no greater than 10% to 25% of the total daily dose) to avoid withdrawal symptoms, and proceed with dose-lowering at an interval of every 2 to 4 weeks. Patients who have been taking opioids for briefer periods of time may tolerate a more rapid taper. It may be necessary to provide the patient with lower dosage strengths to accomplish a successful taper. Reassess the patient frequently to manage pain and withdrawal symptoms, should they emerge. Common withdrawal symptoms include restlessness, lacrimation, rhinorrhea, yawning, perspiration, chills, myalgia, and mydriasis. Other signs and symptoms also may develop, including irritability, anxiety, backache, joint pain, weakness, abdominal cramps, insomnia, nausea, anorexia, vomiting, diarrhea, or increased blood pressure, respiratory rate, or heart rate. If withdrawal symptoms arise, it may be necessary to pause the taper for a period of time or raise the dose of the opioid analgesic to the previous dose, and then proceed with a slower taper. In addition, monitor patients for any changes in mood, emergence of suicidal thoughts, or use of other substances. When managing patients taking opioid analgesics, particularly those who have been treated for a long duration and/or with high doses for chronic pain, ensure that a multimodal approach to pain management, including mental health support (if needed), is in place prior to initiating an opioid analgesic taper. A multimodal approach to pain management may optimize the treatment of chronic pain, as well as assist with the successful tapering of the opioid analgesic [ see Warnings and Precautions (5.17) , Drug Abuse and Dependence (9.3) ].

1 INDICATIONS AND USAGE Tramadol Hydrochloride Extended-Release Capsules are indicated for the management of pain severe enough to require daily, around-the-clock, long term opioid treatment and for which alternative treatment options are inadequate. Tramadol Hydrochloride Extended-Release Capsules are an opioid agonist indicated for the management of pain severe enough to require daily, around-the-clock, long-term opioid treatment and for which alternative treatment options are inadequate. ( 1 ) Limitations of Use Because of the risks of addiction, abuse, and misuse with opioids, even at recommended doses, and because of the greater risks of overdose and death with extended-release opioid formulations, reserve Tramadol Hydrochloride Extended-Release Capsules for use in patients for whom alternative treatment options (e.g., non-opioid analgesics or immediate-release opioids) are ineffective, not tolerated, or would be otherwise inadequate to provide sufficient management of pain. ( 1 ) Tramadol Hydrochloride Extended-Release Capsules are not indicated as an as-needed (prn) analgesic. ( 1 ) Limitation of Use Because of the risks of addiction, abuse, and misuse with opioids, even at recommended doses, and because of the greater risks of overdose and death with extended-release/long-acting opioid formulations [ see Warnings and Precautions (5.1) ], reserve Tramadol Hydrochloride Extended-Release Capsules for use in patients for whom alternative treatment options (e.g., non-opioid analgesics or immediate-release opioids) are ineffective, not tolerated, or would be otherwise inadequate to provide sufficient management of pain. Tramadol Hydrochloride Extended-Release Capsules are not indicated as an as-needed (prn) analgesic.

9.2 Abuse Tramadol Hydrochloride Extended-Release Capsules contain tramadol, a substance with a high potential for abuse similar to other opioids, and can be abused and is subject to misuse, addiction, and criminal diversion [ see Warnings and Precautions (5.1) ]. The high drug content in extended-release formulations adds to the risk of adverse outcomes from abuse and misuse. All patients treated with opioids require careful monitoring for signs of abuse and addiction, because use of opioid analgesic products carries the risk of addiction even under appropriate medical use. Prescription drug abuse is the intentional non-therapeutic use of a prescription drug, even once, for its rewarding psychological or physiological effects. Drug addiction is a cluster of behavioral, cognitive, and physiological phenomena that develop after repeated substance use and includes: a strong desire to take the drug, difficulties in controlling its use, persisting in its use despite harmful consequences, a higher priority given to drug use than to other activities and obligations, increased tolerance, and sometimes a physical withdrawal. "Drug-seeking" behavior is very common in persons with substance use disorders. Drug-seeking tactics include emergency calls or visits near the end of office hours, refusal to undergo appropriate examination, testing, or referral, repeated "loss" of prescriptions, tampering with prescriptions, and reluctance to provide prior medical records or contact information for other treating healthcare providers. "Doctor shopping" (visiting multiple prescribers to obtain additional prescriptions) is common among drug abusers and people suffering from untreated addiction. Preoccupation with achieving adequate pain relief can be appropriate behavior in a patient with poor pain control. Abuse and addiction are separate and distinct from physical dependence and tolerance. Healthcare providers should be aware that addiction may not be accompanied by concurrent tolerance and symptoms of physical dependence in all addicts. In addition, abuse of opioids can occur in the absence of true addiction. Tramadol Hydrochloride Extended-Release Capsules, like other opioids, can be diverted for non-medical use into illicit channels of distribution. Careful record-keeping of prescribing information, including quantity, frequency, and renewal requests, as required by state and federal law, is strongly advised. Proper assessment of the patient, proper prescribing practices, periodic re-evaluation of therapy, and proper dispensing and storage are appropriate measures that help to limit abuse of opioid drugs. Risks Specific to Abuse of Tramadol Hydrochloride Extended-Release Capsules Tramadol Hydrochloride Extended-Release Capsules are for oral use only. The abuse of Tramadol Hydrochloride Extended-Release Capsules poses a risk of overdose and death. The risk is increased with concurrent use of Tramadol Hydrochloride Extended-Release Capsules with alcohol and other central nervous system depressants. With intravenous abuse, the inactive ingredients in Tramadol Hydrochloride Extended-Release Capsules can result in local tissue necrosis, infection, pulmonary granulomas, embolism and death, and increased risk of endocarditis and valvular heart injury. Parenteral drug abuse is commonly associated with transmission of infectious diseases such as hepatitis and HIV.

9.1 Controlled Substance Tramadol Hydrochloride Extended-Release Capsules contain tramadol, a Schedule IV controlled substance.

9.3 Dependence Both tolerance and physical dependence can develop during chronic opioid therapy. Tolerance is the need for increasing doses of opioids to maintain a defined effect such as analgesia (in the absence of disease progression or other external factors). Tolerance may occur to both the desired and undesired effects of drugs, and may develop at different rates for different effects. Physical dependence is a physiological state in which the body adapts to the drug after a period of regular exposure, resulting in withdrawal symptoms after abrupt discontinuation or a significant dosage reduction of a drug. Withdrawal also may be precipitated through the administration of drugs with opioid antagonist activity (e.g., naloxone, nalmefene), mixed agonist/antagonist analgesics (e.g., pentazocine, butorphanol, nalbuphine), or partial agonists (e.g., buprenorphine). Physical dependence may not occur to a clinically significant degree until after several days to weeks of continued opioid usage. Do not abruptly discontinue Tramadol Hydrochloride Extended-Release Capsules in a patient physically dependent on opioids. Rapid tapering of Tramadol Hydrochloride Extended-Release Capsules in a patient physically dependent on opioids may lead to serious withdrawal symptoms, uncontrolled pain, and suicide. Rapid discontinuation has also been associated with attempts to find other sources of opioid analgesics, which may be confused with drug-seeking for abuse. When discontinuing Tramadol Hydrochloride Extended-Release Capsules, gradually taper the dosage using a patient-specific plan that considers the following: the dose of Tramadol Hydrochloride Extended-Release Capsules the patient has been taking, the duration of treatment, and the physical and psychological attributes of the patient. To improve the likelihood of a successful taper and minimize withdrawal symptoms, it is important that the opioid tapering schedule is agreed upon by the patient. In patients taking opioids for a long duration at high doses, ensure that a multimodal approach to pain management, including mental health support (if needed), is in place prior to initiating an opioid analgesic taper [ see Dosage and Administration (2.5) , Warnings and Precautions (5.17) ]. Infants born to mothers physically dependent on opioids will also be physically dependent and may exhibit respiratory difficulties and withdrawal signs [ see Use in Specific Populations (8.1) ].

9 DRUG ABUSE AND DEPENDENCE 9.1 Controlled Substance Tramadol Hydrochloride Extended-Release Capsules contain tramadol, a Schedule IV controlled substance. 9.2 Abuse Tramadol Hydrochloride Extended-Release Capsules contain tramadol, a substance with a high potential for abuse similar to other opioids, and can be abused and is subject to misuse, addiction, and criminal diversion [ see Warnings and Precautions (5.1) ]. The high drug content in extended-release formulations adds to the risk of adverse outcomes from abuse and misuse. All patients treated with opioids require careful monitoring for signs of abuse and addiction, because use of opioid analgesic products carries the risk of addiction even under appropriate medical use. Prescription drug abuse is the intentional non-therapeutic use of a prescription drug, even once, for its rewarding psychological or physiological effects. Drug addiction is a cluster of behavioral, cognitive, and physiological phenomena that develop after repeated substance use and includes: a strong desire to take the drug, difficulties in controlling its use, persisting in its use despite harmful consequences, a higher priority given to drug use than to other activities and obligations, increased tolerance, and sometimes a physical withdrawal. "Drug-seeking" behavior is very common in persons with substance use disorders. Drug-seeking tactics include emergency calls or visits near the end of office hours, refusal to undergo appropriate examination, testing, or referral, repeated "loss" of prescriptions, tampering with prescriptions, and reluctance to provide prior medical records or contact information for other treating healthcare providers. "Doctor shopping" (visiting multiple prescribers to obtain additional prescriptions) is common among drug abusers and people suffering from untreated addiction. Preoccupation with achieving adequate pain relief can be appropriate behavior in a patient with poor pain control. Abuse and addiction are separate and distinct from physical dependence and tolerance. Healthcare providers should be aware that addiction may not be accompanied by concurrent tolerance and symptoms of physical dependence in all addicts. In addition, abuse of opioids can occur in the absence of true addiction. Tramadol Hydrochloride Extended-Release Capsules, like other opioids, can be diverted for non-medical use into illicit channels of distribution. Careful record-keeping of prescribing information, including quantity, frequency, and renewal requests, as required by state and federal law, is strongly advised. Proper assessment of the patient, proper prescribing practices, periodic re-evaluation of therapy, and proper dispensing and storage are appropriate measures that help to limit abuse of opioid drugs. Risks Specific to Abuse of Tramadol Hydrochloride Extended-Release Capsules Tramadol Hydrochloride Extended-Release Capsules are for oral use only. The abuse of Tramadol Hydrochloride Extended-Release Capsules poses a risk of overdose and death. The risk is increased with concurrent use of Tramadol Hydrochloride Extended-Release Capsules with alcohol and other central nervous system depressants. With intravenous abuse, the inactive ingredients in Tramadol Hydrochloride Extended-Release Capsules can result in local tissue necrosis, infection, pulmonary granulomas, embolism and death, and increased risk of endocarditis and valvular heart injury. Parenteral drug abuse is commonly associated with transmission of infectious diseases such as hepatitis and HIV. 9.3 Dependence Both tolerance and physical dependence can develop during chronic opioid therapy. Tolerance is the need for increasing doses of opioids to maintain a defined effect such as analgesia (in the absence of disease progression or other external factors). Tolerance may occur to both the desired and undesired effects of drugs, and may develop at different rates for different effects. Physical dependence is a physiological state in which the body adapts to the drug after a period of regular exposure, resulting in withdrawal symptoms after abrupt discontinuation or a significant dosage reduction of a drug. Withdrawal also may be precipitated through the administration of drugs with opioid antagonist activity (e.g., naloxone, nalmefene), mixed agonist/antagonist analgesics (e.g., pentazocine, butorphanol, nalbuphine), or partial agonists (e.g., buprenorphine). Physical dependence may not occur to a clinically significant degree until after several days to weeks of continued opioid usage. Do not abruptly discontinue Tramadol Hydrochloride Extended-Release Capsules in a patient physically dependent on opioids. Rapid tapering of Tramadol Hydrochloride Extended-Release Capsules in a patient physically dependent on opioids may lead to serious withdrawal symptoms, uncontrolled pain, and suicide. Rapid discontinuation has also been associated with attempts to find other sources of opioid analgesics, which may be confused with drug-seeking for abuse. When discontinuing Tramadol Hydrochloride Extended-Release Capsules, gradually taper the dosage using a patient-specific plan that considers the following: the dose of Tramadol Hydrochloride Extended-Release Capsules the patient has been taking, the duration of treatment, and the physical and psychological attributes of the patient. To improve the likelihood of a successful taper and minimize withdrawal symptoms, it is important that the opioid tapering schedule is agreed upon by the patient. In patients taking opioids for a long duration at high doses, ensure that a multimodal approach to pain management, including mental health support (if needed), is in place prior to initiating an opioid analgesic taper [ see Dosage and Administration (2.5) , Warnings and Precautions (5.17) ]. Infants born to mothers physically dependent on opioids will also be physically dependent and may exhibit respiratory difficulties and withdrawal signs [ see Use in Specific Populations (8.1) ].

10 OVERDOSAGE Clinical Presentation Acute overdosage with Tramadol Hydrochloride Extended-Release Capsules can be manifested by respiratory depression, somnolence progressing to stupor or coma, skeletal muscle flaccidity, cold and clammy skin, constricted pupils, and, in some cases, pulmonary edema, bradycardia, QT prolongation, hypotension, partial or complete airway obstruction, atypical snoring, and death. Marked mydriasis rather than miosis may be seen with hypoxia in overdose situations [ see Clinical Pharmacology (12.2) ]. Treatment of Overdose In case of overdosage, priorities are the reestablishment of a patent and protected airway and institution of assisted or controlled ventilation, if needed. Employ other supportive measures (including oxygen and vasopressors) in the management of circulatory shock and pulmonary edema as indicated. Cardiac arrest or arrhythmias will require advanced life-support techniques. Opioid antagonists, such as naloxone, are specific antidotes to respiratory depression resulting from opioid overdose. For clinically significant respiratory or circulatory depression secondary to opioid overdose, administer an opioid antagonist. While naloxone will reverse some, but not all, symptoms caused by overdosage with tramadol, the risk of seizures is also increased with naloxone administration. In animals, convulsions following the administration of toxic doses of Tramadol Hydrochloride Extended-Release Capsules could be suppressed with barbiturates or benzodiazepines but were increased with naloxone. Naloxone administration did not change the lethality of an overdose in mice. Hemodialysis is not expected to be helpful in an overdose because it removes less than 7% of the administered dose in a 4-hour dialysis period. Because the duration of opioid reversal is expected to be less than the duration of action of tramadol in Tramadol Hydrochloride Extended-Release Capsules, carefully monitor the patient until spontaneous respiration is reliably reestablished. Tramadol Hydrochloride Extended-Release Capsules will continue to release tramadol and add to the tramadol load for 24 to 48 hours or longer following ingestion, necessitating prolonged monitoring. If the response to an opioid antagonist is suboptimal or only brief in nature, administer additional antagonist as directed by the product's prescribing information. In an individual physically dependent on opioids, administration of the recommended usual dosage of the antagonist will precipitate an acute withdrawal syndrome. The severity of the withdrawal symptoms experienced will depend on the degree of physical dependence and the dose of the antagonist administered. If a decision is made to treat serious respiratory depression in the physically dependent patient, administration of the antagonist should be begun with care and by titration with smaller than usual doses of the antagonist.

7 DRUG INTERACTIONS Table 2 includes clinically significant drug interactions with Tramadol Hydrochloride Extended-Release Capsules. Table 2: Clinically Significant Drug Interactions with Tramadol Hydrochloride Extended-Release Capsules Inhibitors of CYP2D6 Clinical Impact: The concomitant use of Tramadol Hydrochloride Extended-Release Capsules and CYP2D6 inhibitors may result in an increase in the plasma concentration of tramadol and a decrease in the plasma concentration of M1, particularly when an inhibitor is added after a stable dose of Tramadol Hydrochloride Extended-Release Capsules is achieved. Since M1 is a more potent mu-opioid agonist, decreased M1 exposure could result in decreased therapeutic effects, and may result in signs and symptoms of opioid withdrawal in patients who had developed physical dependence to tramadol. Increased tramadol exposure can result in increased or prolonged therapeutic effects and increased risk for serious adverse events including seizures and serotonin syndrome. After stopping a CYP2D6 inhibitor, as the effects of the inhibitor decline, the tramadol plasma concentration will decrease and the M1 plasma concentration will increase which could increase or prolong therapeutic effects but also increase adverse reactions related to opioid toxicity, and may cause potentially fatal respiratory depression [ see Clinical Pharmacology (12.3) ]. Intervention: If concomitant use of a CYP2D6 inhibitor is necessary, follow patients closely for adverse reactions including opioid withdrawal, seizures, and serotonin syndrome. If a CYP2D6 inhibitor is discontinued, consider lowering Tramadol Hydrochloride Extended-Release Capsules dosage until stable drug effects are achieved. Follow patients closely for adverse events including respiratory depression and sedation. Examples: Quinidine, fluoxetine, paroxetine and bupropion Inhibitors of CYP3A4 Clinical Impact: The concomitant use of Tramadol Hydrochloride Extended-Release Capsules and CYP3A4 inhibitors can increase the plasma concentration of tramadol and may result in a greater amount of metabolism via CYP2D6 and greater levels of M1. Follow patients closely for increased risk of serious adverse events including seizures and serotonin syndrome, and adverse reactions related to opioid toxicity including potentially fatal respiratory depression, particularly when an inhibitor is added after a stable dose of Tramadol Hydrochloride Extended-Release Capsules is achieved. After stopping a CYP3A4 inhibitor, as the effects of the inhibitor decline, the tramadol plasma concentration will decrease [ see Clinical Pharmacology (12.3) ], resulting in decreased opioid efficacy and possibly signs and symptoms of opioid withdrawal in patients who had developed physical dependence to tramadol. Intervention: If concomitant use is necessary, consider dosage reduction of Tramadol Hydrochloride Extended-Release Capsules until stable drug effects are achieved. Follow patients closely for seizures and serotonin syndrome, and signs of respiratory depression and sedation at frequent intervals. If a CYP3A4 inhibitor is discontinued, consider increasing the Tramadol Hydrochloride Extended-Release Capsules dosage until stable drug effects are achieved and follow patients for signs and symptoms of opioid withdrawal. Examples: Macrolide antibiotics (e.g., erythromycin), azole-antifungal agents (e.g., ketoconazole), protease inhibitors (e.g., ritonavir) CYP3A4 Inducers Clinical Impact: The concomitant use of Tramadol Hydrochloride Extended-Release Capsules and CYP3A4 inducers can decrease the plasma concentration of tramadol, [ see Clinical Pharmacology (12.3) ], resulting in decreased efficacy or onset of a withdrawal syndrome in patients who have developed physical dependence to tramadol, [ see Warnings and Precautions (5.6) ]. After stopping a CYP3A4 inducer, as the effects of the inducer decline, the tramadol plasma concentration will increase [ see Clinical Pharmacology (12.3) ], which could increase or prolong both the therapeutic effects and adverse reactions, and may cause seizures and serotonin syndrome, and potentially fatal respiratory depression. Intervention: If concomitant use is necessary, consider increasing the Tramadol Hydrochloride Extended-Release Capsules dosage until stable drug effects are achieved. Follow patients for signs of opioid withdrawal. If a CYP3A4 inducer is discontinued, consider Tramadol Hydrochloride Extended-Release Capsules dosage reduction and monitor for seizures and serotonin syndrome, and signs of sedation and respiratory depression. Patients taking carbamazepine, a CYP3A4 inducer, may have a significantly reduced analgesic effect of tramadol. Because carbamazepine increases tramadol metabolism and because of the seizure risk associated with tramadol, concomitant administration of Tramadol Hydrochloride Extended-Release Capsules and carbamazepine is not recommended. Examples: Rifampin, carbamazepine, phenytoin Benzodiazepines and Other Central Nervous System (CNS) Depressants Clinical Impact: Due to additive pharmacologic effect, the concomitant use of benzodiazepines or other CNS depressants, including alcohol, can increase the risk of hypotension, respiratory depression, profound sedation, coma, and death. Intervention: Reserve concomitant prescribing of these drugs for use in patients for whom alternative treatment options are inadequate. Limit dosages and durations to the minimum required. Follow patients closely for signs of respiratory depression and sedation. If concomitant use is warranted, consider prescribing naloxone for the emergency treatment of opioid overdose [ see Dosage and Administration (2.2) , Warnings and Precautions (5.1 , 5.3 , 5.7) ]. Examples: Benzodiazepines and other sedatives/hypnotics, anxiolytics, tranquilizers, muscle relaxants, general anesthetics, antipsychotics, other opioids, alcohol Serotonergic Drugs Clinical Impact: The concomitant use of opioids with other drugs that affect the serotonergic neurotransmitter system has resulted in serotonin syndrome . Intervention: If concomitant use is warranted, carefully observe the patient, particularly during treatment initiation and dose adjustment. Discontinue Tramadol Hydrochloride Extended-Release Capsules if serotonin syndrome is suspected. Examples: Selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), triptans, 5-HT3 receptor antagonists, drugs that affect the serotonin neurotransmitter system (e.g., mirtazapine, trazodone, tramadol), certain muscle relaxants (i.e., cyclobenzaprine, metaxalone), monoamine oxidase (MAO) inhibitors (those intended to treat psychiatric disorders and also others, such as linezolid and intravenous methylene blue) Monoamine Oxidase Inhibitors (MAOIs) Clinical Impact: MAOI interactions with opioids may manifest as serotonin syndrome [ see Warnings and Precautions (5.9) ] or opioid toxicity (e.g., respiratory depression, coma) [ see Warnings and Precautions (5.3) ]. Intervention: Do not use Tramadol Hydrochloride Extended-Release Capsules in patients taking MAOIs or within 14 days of stopping such treatment. Examples: Phenelzine, tranylcypromine, linezolid Mixed Agonist/Antagonist and Partial Agonist Opioid Analgesics Clinical Impact: May reduce the analgesic effect of Tramadol Hydrochloride Extended-Release Capsules and/or precipitate withdrawal symptoms. Intervention: Avoid concomitant use. Examples: Butorphanol, nalbuphine, pentazocine, buprenorphine Muscle Relaxants Clinical Impact: Tramadol may enhance the neuromuscular blocking action of skeletal muscle relaxants and produce an increased degree of respiratory depression. Intervention: Monitor patients for signs of respiratory depression that may be greater than otherwise expected and decrease the dosage of Tramadol Hydrochloride Extended-Release Capsules and/or the muscle relaxant as necessary. Due to the risk of respiratory depression with concomitant use of skeletal muscle relaxants and opioids, consider prescribing naloxone for the emergency treatment of opioid overdose [ see Dosage and Administration (2.2) , Warnings and Precautions (5.3 , 5.7) ]. Diuretics Clinical Impact: Opioids can reduce the efficacy of diuretics by inducing the release of antidiuretic hormone. Intervention: Monitor patients for signs of diminished diuresis and/or effects on blood pressure and increase the dosage of the diuretic as needed. Anticholinergic Drugs Clinical Impact: The concomitant use of anticholinergic drugs may increase risk of urinary retention and/or severe constipation, which may lead to paralytic ileus. Intervention: Monitor patients for signs of urinary retention or reduced gastric motility when Tramadol Hydrochloride Extended-Release Capsules are used concomitantly with anticholinergic drugs. Digoxin Clinical Impact: Post-marketing surveillance of tramadol has revealed rare reports of digoxin toxicity. Intervention: Follow patients for signs of digoxin toxicity and adjust dosage of digoxin as needed. Warfarin Clinical Impact: Post-marketing surveillance of tramadol has revealed rare reports of alteration of warfarin effect, including elevation of prothrombin times. Intervention: Monitor the prothrombin time of patients on warfarin for signs of an interaction and adjust the dosage of warfarin as needed. Mixed Agonist/Antagonist and Partial Agonist Opioid Analgesics : Avoid use with Tramadol Hydrochloride Extended-Release Capsules because they may reduce analgesic effect of Tramadol Hydrochloride Extended-Release Capsules or precipitate withdrawal symptoms. ( 5.17 , 7 )

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Tramadol Hydrochloride Extended-Release Capsules contain tramadol, an opioid agonist, and an inhibitor of reuptake of norepinephrine and serotonin. Although its mode of action is not completely understood, from animal tests, at least two complementary mechanisms appear applicable: binding of parent and M1 metabolite to mu-opioid receptors and weak inhibition of reuptake of norepinephrine and serotonin. Opioid activity of tramadol is due to both low affinity binding of the parent compound and higher affinity binding of the O-demethylated metabolite M1 to mu-opioid receptors. In animal models, M1 is up to 6 times more potent than tramadol in producing analgesia and 200 times more potent in mu-opioid binding. Tramadol-induced analgesia is only partially antagonized by the opioid antagonist naloxone in several animal tests. The relative contribution of both tramadol and M1 to human analgesia is dependent upon the plasma concentrations of each compound. Tramadol has been shown to inhibit reuptake of norepinephrine and serotonin in vitro, as have some other opioid analgesics. These mechanisms may contribute independently to the overall analgesic profile of tramadol. The relationship between exposure of tramadol and M1 and efficacy has not been evaluated in clinical studies. Apart from analgesia, tramadol administration may produce a constellation of symptoms (including dizziness, somnolence, nausea, constipation, sweating and pruritus) similar to that of other opioids. In contrast to morphine, tramadol has not been shown to cause histamine release. At therapeutic doses, tramadol has no effect on heart rate, left ventricular function or cardiac index. Orthostatic hypotension has been observed. 12.2 Pharmacodynamics Effects on the Central Nervous System Tramadol produces respiratory depression by direct action on brain stem respiratory centers. The respiratory depression involves a reduction in the responsiveness of the brain stem respiratory centers to both increases in carbon dioxide tension and electrical stimulation. Tramadol causes miosis, even in total darkness. Pinpoint pupils are a sign of opioid overdose but are not pathognomonic (e.g., pontine lesions of hemorrhagic or ischemic origins may produce similar findings). Marked mydriasis rather than miosis may be seen due to hypoxia in overdose situations. Effects on the Gastrointestinal Tract and Other Smooth Muscle Tramadol causes a reduction in motility associated with an increase in smooth muscle tone in the antrum of the stomach and duodenum. Digestion of food in the small intestine is delayed and propulsive contractions are decreased. Propulsive peristaltic waves in the colon are decreased, while tone is increased to the point of spasm, resulting in constipation. Other opioid-induced effects may include a reduction in biliary and pancreatic secretions, spasm of sphincter of Oddi, and transient elevations in serum amylase. Effects on the Cardiovascular System Tramadol produces peripheral vasodilation, which may result in orthostatic hypotension or syncope. Manifestations of histamine release and/or peripheral vasodilation may include pruritus, flushing, red eyes, sweating, and/or orthostatic hypotension. The effect of oral tramadol on the QTcF interval was evaluated in a double-blind, randomized, four-way crossover, placebo- and positive- (moxifloxacin) controlled study in 68 adult male and female healthy subjects. At a 600 mg/day dose (1.5-fold the maximum immediate-release daily dose), the study demonstrated no significant effect on the QTcF interval. Effects on the Endocrine System Opioids inhibit the secretion of adrenocorticotropic hormone (ACTH), cortisol, and luteinizing hormone (LH) in humans [ see Adverse Reactions (6.2) ]. They also stimulate prolactin, growth hormone (GH) secretion, and pancreatic secretion of insulin and glucagon. Chronic use of opioids may influence the hypothalamic-pituitary-gonadal axis, leading to androgen deficiency that may manifest as low libido, impotence, erectile dysfunction, amenorrhea, or infertility. The causal role of opioids in the clinical syndrome of hypogonadism is unknown because the various medical, physical, lifestyle, and psychological stressors that may influence gonadal hormone levels have not been adequately controlled for in studies conducted to date [ see Adverse Reactions (6.2) ]. Effects on the Immune System Opioids have been shown to have a variety of effects on components of the immune system in in vitro and animal models. The clinical significance of these findings is unknown. Overall, the effects of opioids appear to be modestly immunosuppressive. Concentration–Efficacy Relationships The minimum effective analgesic concentration will vary widely among patients, especially among patients who have been previously treated with potent agonist opioids. The minimum effective analgesic concentration of tramadol for any individual patient may increase over time due to an increase in pain, the development of a new pain syndrome, and/or the development of analgesic tolerance [ see Dosage and Administration (2.1 , 2.4) ]. Concentration–Adverse Reaction Relationships There is a relationship between increasing tramadol plasma concentration and increasing frequency of dose-related opioid adverse reactions such as nausea, vomiting, CNS effects, and respiratory depression. In opioid-tolerant patients, the situation may be altered by the development of tolerance to opioid-related adverse reactions [ see Dosage and Administration (2.1 , 2.3 , 2.4) ]. 12.3 Pharmacokinetics The analgesic activity of tramadol is due to both parent drug and the M1 metabolite. Tramadol Hydrochloride Extended-Release Capsules are administered as a racemate and both tramadol and M1 are detected in the circulation. The C max and AUC of Tramadol Hydrochloride Extended-Release Capsules have been observed to be dose-proportional over an oral dose range of 100 to 300 mg in healthy subjects. Absorption After a single dose administration of Tramadol Hydrochloride Extended-Release Capsules, T max occurs around 10-12 hours. The mean C max and AUC of Tramadol Hydrochloride Extended-Release Capsules after a 300 mg single dose was 308 ng/mL and 6777 ng.hr/mL, respectively under fasting conditions. Tramadol Hydrochloride Extended-Release Capsules are bioequivalent to a reference extended-release tramadol product following a single 300 mg dose under fasting conditions. At steady-state, Tramadol Hydrochloride Extended-Release Capsules at 200 mg have been observed to be bioequivalent to a reference extended-release tramadol product at 200 mg under fasting conditions (Table 3). Following administration of Tramadol Hydrochloride Extended-Release Capsules 200 mg, steady-state plasma concentrations of both tramadol and M1 are achieved within four days of once daily dosing. Table 3 Mean (%CV) Steady-State Pharmacokinetic Parameter Values (N= 38) Tramadol O-Desmethyltramadol (M1 Metabolite) Parameter Tramadol hydrochloride Extended- Release Capsules 200 mg A Reference Extended-Release Tramadol Product 200 mg Tramadol hydrochloride Extended-Release Capsules 200 mg A Reference Extended-Release Tramadol Product 200 mg AUC 0-24 : Area Under the Curve in a 24-hour dosing interval C max : Peak Concentration in a 24-hour dosing interval C min : Trough Concentration in a 24-hour dosing interval T max : Time to Peak Concentration AUC 0-24 (ng.hr/mL) 5678 (27%) 5563 (32%) 1319 (34%) 1302 (40%) C max (ng/mL) 332 (25%) 350 (31%) 70 (34%) 74 (41%) C min (ng/mL) 128 (39%) 125 (45%) 35 (34%) 33 (42%) T max 5.9 (66%) 10 (30%) 11 (37%) 13 (29%) % Fluctuation 88 (19%) 101 (30%) 64 (22%) 76 (30%) Food Effect The rate and extent of absorption of Tramadol Hydrochloride Extended-Release Capsules (300 mg) are similar following oral administration with or without food. Therefore, Tramadol Hydrochloride Extended-Release Capsules can be administered without regard to meals. Distribution The volume of distribution of tramadol was 2.6 and 2.9 liters/kg in male and female subjects, respectively, following a 100 mg intravenous tramadol dose. The binding of tramadol to human plasma proteins is approximately 20% and binding also appears to be independent of concentration up to 10 mcg/mL. Saturation of plasma protein binding occurs only at concentrations outside the clinically relevant range. Elimination Tramadol is eliminated primarily through metabolism by the liver and the metabolites are eliminated primarily by the kidneys. The mean plasma elimination half-lives of racemic tramadol and racemic M1 after administration of Tramadol Hydrochloride Extended-Release Capsules are approximately 10 and 11 hours, respectively. Metabolism Tramadol is extensively metabolized after oral administration. The major metabolic pathways appear to be N- (mediated by CYP3A4 and CYP2B6) and O- (mediated by CYP2D6) demethylation and glucuronidation or sulfation in the liver. One metabolite (O-desmethyltramadol, denoted M1) is pharmacologically active in animal models. Formation of M1 is dependent on CYP2D6 and as such is subject to inhibition and polymorphism, which may affect the therapeutic response [ see Drug Interactions (7) ]. Excretion Approximately 30% of the dose is excreted in the urine as unchanged drug, whereas 60% of the dose is excreted as metabolites. The remainder is excreted either as unidentified or as unextractable metabolites. Special Populations Hepatic Impairment Pharmacokinetics of tramadol was studied in patients with mild or moderate hepatic impairment after receiving multiple doses of an extended-release tramadol product at 100 mg. The exposure of (+)- and (-)-tramadol was similar in mild and moderate hepatic impairment patients in comparison to patients with normal hepatic function. However, exposure of (+)- and (-)-M1 decreased ~50% with increased severity of the hepatic impairment (from normal to mild and moderate). The pharmacokinetics of tramadol has not been studied in patients with severe hepatic impairment. After the administration of tramadol immediate-release tablets to patients with advanced cirrhosis of the liver, tramadol area under the plasma concentration time curve was larger and the tramadol and M1 half-lives were longer than subjects with normal hepatic function. The limited availability of dose strengths of Tramadol Hydrochloride Extended-Release Capsules does not permit the dosing flexibility required for safe use in patients with severe hepatic impairment. Therefore, Tramadol Hydrochloride Extended-Release Capsules should not be used in patients with severe hepatic impairment [ see Use in Specific Populations (8.6) ]. Renal Impairment Impaired renal function results in a decreased rate and extent of excretion of tramadol and its active metabolite, M1. The pharmacokinetics of tramadol was studied in patients with mild or moderate renal impairment after receiving multiple doses of an extended-release tramadol product at 100 mg. There is no consistent trend observed for tramadol exposure related to renal function in patients with mild (CL cr : 50-80 mL/min) or moderate (CL cr : 30-50 mL/min) renal impairment in comparison to patients with normal renal function (CL cr > 80 mL/min). However, exposure of M1 increased 20-40% with increased severity of the renal impairment (from normal to mild and moderate). The pharmacokinetics of tramadol has not been studied in patients with severe renal impairment (CL cr < 30 mL/min). The limited availability of dose strengths of Tramadol Hydrochloride Extended-Release Capsules does not permit the dosing flexibility required for safe use in patients with severe renal impairment. Therefore, Tramadol Hydrochloride Extended-Release Capsules should not be used in patients with severe renal impairment. The total amount of tramadol and M1 removed during a 4-hour dialysis period is less than 7% of the administered dose [ see Use in Specific Populations (8.6) ]. Sex Based on pooled multiple-dose pharmacokinetics studies for an extended-release tramadol product in 166 healthy subjects (111 males and 55 females), the dose-normalized AUC values for tramadol were somewhat higher in females than in males. There was a considerable degree of overlap in values between male and female groups. Dosage adjustment based on sex is not recommended. Age: Geriatric Population The effect of age on pharmacokinetics of Tramadol Hydrochloride Extended-Release Capsules has not been studied. Healthy elderly subjects aged 65 to 75 years administered an immediate-release formulation of tramadol, have plasma concentrations and elimination half-lives comparable to those observed in healthy subjects younger than 65 years of age. In subjects over 75 years, mean maximum plasma concentrations are elevated (208 vs. 162 ng/mL) and the mean elimination half-life is prolonged (7 vs. 6 hours) compared to subjects 65 to 75 years of age. Adjustment of the daily dose is recommended for patients older than 75 years [ see Dosage and Administration (2.3) ]. Drug Interaction Studies Potential for Tramadol to Affect Other Drugs In vitro studies indicate that tramadol is unlikely to inhibit the CYP3A4-mediated metabolism of other drugs when tramadol is administered concomitantly at therapeutic doses. Tramadol does not appear to induce its own metabolism in humans, since observed maximal plasma concentrations after multiple oral doses are higher than expected based on single-dose data. Poor / Extensive Metabolizers, CYP2D6 The formation of the active metabolite, M1, is mediated by CYP2D6, a polymorphic enzyme. Approximately 7% of the population has reduced activity of the CYP2D6 isoenzyme of cytochrome P-450 metabolizing enzyme system. These individuals are "poor metabolizers" of debrisoquine, dextromethorphan and tricyclic antidepressants, among other drugs. Based on a population PK analysis of Phase 1 studies with IR tablets in healthy subjects, concentrations of tramadol were approximately 20% higher in "poor metabolizers" versus "extensive metabolizers," while M1 concentrations were 40% lower. CYP2D6 Inhibitors In vitro drug interaction studies in human liver microsomes indicate that concomitant administration with inhibitors of CYP2D6 such as fluoxetine, paroxetine, and amitriptyline could result in some inhibition of the metabolism of tramadol. Quinidine Tramadol is metabolized to active metabolite M1 by CYP2D6. Coadministration of quinidine, a selective inhibitor of CYP2D6, with tramadol ER resulted in a 50-60% increase in tramadol exposure and a 50-60% decrease in M1 exposure. The clinical consequences of these findings are unknown. To evaluate the effect of tramadol, a CYP2D6 substrate on quinidine, an in vitro drug interaction study in human liver microsomes was conducted. The results from this study indicate that tramadol has no effect on quinidine metabolism [ see Warnings and Precautions (5.1 , 5.6) , Drug Interactions (7) ]. CYP3A4 Inhibitors and Inducers Since tramadol is also metabolized by CYP3A4, administration of CYP3A4 inhibitors, such as ketoconazole and erythromycin, or CYP3A4 inducers, such as rifampin and St. John's Wort, with Tramadol Hydrochloride Extended-Release Capsules may affect the metabolism of tramadol leading to altered tramadol exposure [ see Warnings and Precautions (5.1 , 5.6) , Drug Interactions (7) ]. Cimetidine Concomitant administration of tramadol immediate-release tablets with cimetidine, a weak CPY3A4 inhibitor, does not result in clinically significant changes in tramadol pharmacokinetics. No alteration of the Tramadol Hydrochloride Extended-Release Capsules dosage regimen with cimetidine is recommended. Carbamazepine Carbamazepine, a CYP3A4 inducer, increases tramadol metabolism. Patients taking carbamazepine may have a significantly reduced analgesic effect of tramadol. Concomitant administration of Tramadol Hydrochloride Extended-Release Capsules and carbamazepine is not recommended .

12.1 Mechanism of Action Tramadol Hydrochloride Extended-Release Capsules contain tramadol, an opioid agonist, and an inhibitor of reuptake of norepinephrine and serotonin. Although its mode of action is not completely understood, from animal tests, at least two complementary mechanisms appear applicable: binding of parent and M1 metabolite to mu-opioid receptors and weak inhibition of reuptake of norepinephrine and serotonin. Opioid activity of tramadol is due to both low affinity binding of the parent compound and higher affinity binding of the O-demethylated metabolite M1 to mu-opioid receptors. In animal models, M1 is up to 6 times more potent than tramadol in producing analgesia and 200 times more potent in mu-opioid binding. Tramadol-induced analgesia is only partially antagonized by the opioid antagonist naloxone in several animal tests. The relative contribution of both tramadol and M1 to human analgesia is dependent upon the plasma concentrations of each compound. Tramadol has been shown to inhibit reuptake of norepinephrine and serotonin in vitro, as have some other opioid analgesics. These mechanisms may contribute independently to the overall analgesic profile of tramadol. The relationship between exposure of tramadol and M1 and efficacy has not been evaluated in clinical studies. Apart from analgesia, tramadol administration may produce a constellation of symptoms (including dizziness, somnolence, nausea, constipation, sweating and pruritus) similar to that of other opioids. In contrast to morphine, tramadol has not been shown to cause histamine release. At therapeutic doses, tramadol has no effect on heart rate, left ventricular function or cardiac index. Orthostatic hypotension has been observed.

12.2 Pharmacodynamics Effects on the Central Nervous System Tramadol produces respiratory depression by direct action on brain stem respiratory centers. The respiratory depression involves a reduction in the responsiveness of the brain stem respiratory centers to both increases in carbon dioxide tension and electrical stimulation. Tramadol causes miosis, even in total darkness. Pinpoint pupils are a sign of opioid overdose but are not pathognomonic (e.g., pontine lesions of hemorrhagic or ischemic origins may produce similar findings). Marked mydriasis rather than miosis may be seen due to hypoxia in overdose situations. Effects on the Gastrointestinal Tract and Other Smooth Muscle Tramadol causes a reduction in motility associated with an increase in smooth muscle tone in the antrum of the stomach and duodenum. Digestion of food in the small intestine is delayed and propulsive contractions are decreased. Propulsive peristaltic waves in the colon are decreased, while tone is increased to the point of spasm, resulting in constipation. Other opioid-induced effects may include a reduction in biliary and pancreatic secretions, spasm of sphincter of Oddi, and transient elevations in serum amylase. Effects on the Cardiovascular System Tramadol produces peripheral vasodilation, which may result in orthostatic hypotension or syncope. Manifestations of histamine release and/or peripheral vasodilation may include pruritus, flushing, red eyes, sweating, and/or orthostatic hypotension. The effect of oral tramadol on the QTcF interval was evaluated in a double-blind, randomized, four-way crossover, placebo- and positive- (moxifloxacin) controlled study in 68 adult male and female healthy subjects. At a 600 mg/day dose (1.5-fold the maximum immediate-release daily dose), the study demonstrated no significant effect on the QTcF interval. Effects on the Endocrine System Opioids inhibit the secretion of adrenocorticotropic hormone (ACTH), cortisol, and luteinizing hormone (LH) in humans [ see Adverse Reactions (6.2) ]. They also stimulate prolactin, growth hormone (GH) secretion, and pancreatic secretion of insulin and glucagon. Chronic use of opioids may influence the hypothalamic-pituitary-gonadal axis, leading to androgen deficiency that may manifest as low libido, impotence, erectile dysfunction, amenorrhea, or infertility. The causal role of opioids in the clinical syndrome of hypogonadism is unknown because the various medical, physical, lifestyle, and psychological stressors that may influence gonadal hormone levels have not been adequately controlled for in studies conducted to date [ see Adverse Reactions (6.2) ]. Effects on the Immune System Opioids have been shown to have a variety of effects on components of the immune system in in vitro and animal models. The clinical significance of these findings is unknown. Overall, the effects of opioids appear to be modestly immunosuppressive. Concentration–Efficacy Relationships The minimum effective analgesic concentration will vary widely among patients, especially among patients who have been previously treated with potent agonist opioids. The minimum effective analgesic concentration of tramadol for any individual patient may increase over time due to an increase in pain, the development of a new pain syndrome, and/or the development of analgesic tolerance [ see Dosage and Administration (2.1 , 2.4) ]. Concentration–Adverse Reaction Relationships There is a relationship between increasing tramadol plasma concentration and increasing frequency of dose-related opioid adverse reactions such as nausea, vomiting, CNS effects, and respiratory depression. In opioid-tolerant patients, the situation may be altered by the development of tolerance to opioid-related adverse reactions [ see Dosage and Administration (2.1 , 2.3 , 2.4) ].

12.3 Pharmacokinetics The analgesic activity of tramadol is due to both parent drug and the M1 metabolite. Tramadol Hydrochloride Extended-Release Capsules are administered as a racemate and both tramadol and M1 are detected in the circulation. The C max and AUC of Tramadol Hydrochloride Extended-Release Capsules have been observed to be dose-proportional over an oral dose range of 100 to 300 mg in healthy subjects. Absorption After a single dose administration of Tramadol Hydrochloride Extended-Release Capsules, T max occurs around 10-12 hours. The mean C max and AUC of Tramadol Hydrochloride Extended-Release Capsules after a 300 mg single dose was 308 ng/mL and 6777 ng.hr/mL, respectively under fasting conditions. Tramadol Hydrochloride Extended-Release Capsules are bioequivalent to a reference extended-release tramadol product following a single 300 mg dose under fasting conditions. At steady-state, Tramadol Hydrochloride Extended-Release Capsules at 200 mg have been observed to be bioequivalent to a reference extended-release tramadol product at 200 mg under fasting conditions (Table 3). Following administration of Tramadol Hydrochloride Extended-Release Capsules 200 mg, steady-state plasma concentrations of both tramadol and M1 are achieved within four days of once daily dosing. Table 3 Mean (%CV) Steady-State Pharmacokinetic Parameter Values (N= 38) Tramadol O-Desmethyltramadol (M1 Metabolite) Parameter Tramadol hydrochloride Extended- Release Capsules 200 mg A Reference Extended-Release Tramadol Product 200 mg Tramadol hydrochloride Extended-Release Capsules 200 mg A Reference Extended-Release Tramadol Product 200 mg AUC 0-24 : Area Under the Curve in a 24-hour dosing interval C max : Peak Concentration in a 24-hour dosing interval C min : Trough Concentration in a 24-hour dosing interval T max : Time to Peak Concentration AUC 0-24 (ng.hr/mL) 5678 (27%) 5563 (32%) 1319 (34%) 1302 (40%) C max (ng/mL) 332 (25%) 350 (31%) 70 (34%) 74 (41%) C min (ng/mL) 128 (39%) 125 (45%) 35 (34%) 33 (42%) T max 5.9 (66%) 10 (30%) 11 (37%) 13 (29%) % Fluctuation 88 (19%) 101 (30%) 64 (22%) 76 (30%) Food Effect The rate and extent of absorption of Tramadol Hydrochloride Extended-Release Capsules (300 mg) are similar following oral administration with or without food. Therefore, Tramadol Hydrochloride Extended-Release Capsules can be administered without regard to meals. Distribution The volume of distribution of tramadol was 2.6 and 2.9 liters/kg in male and female subjects, respectively, following a 100 mg intravenous tramadol dose. The binding of tramadol to human plasma proteins is approximately 20% and binding also appears to be independent of concentration up to 10 mcg/mL. Saturation of plasma protein binding occurs only at concentrations outside the clinically relevant range. Elimination Tramadol is eliminated primarily through metabolism by the liver and the metabolites are eliminated primarily by the kidneys. The mean plasma elimination half-lives of racemic tramadol and racemic M1 after administration of Tramadol Hydrochloride Extended-Release Capsules are approximately 10 and 11 hours, respectively. Metabolism Tramadol is extensively metabolized after oral administration. The major metabolic pathways appear to be N- (mediated by CYP3A4 and CYP2B6) and O- (mediated by CYP2D6) demethylation and glucuronidation or sulfation in the liver. One metabolite (O-desmethyltramadol, denoted M1) is pharmacologically active in animal models. Formation of M1 is dependent on CYP2D6 and as such is subject to inhibition and polymorphism, which may affect the therapeutic response [ see Drug Interactions (7) ]. Excretion Approximately 30% of the dose is excreted in the urine as unchanged drug, whereas 60% of the dose is excreted as metabolites. The remainder is excreted either as unidentified or as unextractable metabolites. Special Populations Hepatic Impairment Pharmacokinetics of tramadol was studied in patients with mild or moderate hepatic impairment after receiving multiple doses of an extended-release tramadol product at 100 mg. The exposure of (+)- and (-)-tramadol was similar in mild and moderate hepatic impairment patients in comparison to patients with normal hepatic function. However, exposure of (+)- and (-)-M1 decreased ~50% with increased severity of the hepatic impairment (from normal to mild and moderate). The pharmacokinetics of tramadol has not been studied in patients with severe hepatic impairment. After the administration of tramadol immediate-release tablets to patients with advanced cirrhosis of the liver, tramadol area under the plasma concentration time curve was larger and the tramadol and M1 half-lives were longer than subjects with normal hepatic function. The limited availability of dose strengths of Tramadol Hydrochloride Extended-Release Capsules does not permit the dosing flexibility required for safe use in patients with severe hepatic impairment. Therefore, Tramadol Hydrochloride Extended-Release Capsules should not be used in patients with severe hepatic impairment [ see Use in Specific Populations (8.6) ]. Renal Impairment Impaired renal function results in a decreased rate and extent of excretion of tramadol and its active metabolite, M1. The pharmacokinetics of tramadol was studied in patients with mild or moderate renal impairment after receiving multiple doses of an extended-release tramadol product at 100 mg. There is no consistent trend observed for tramadol exposure related to renal function in patients with mild (CL cr : 50-80 mL/min) or moderate (CL cr : 30-50 mL/min) renal impairment in comparison to patients with normal renal function (CL cr > 80 mL/min). However, exposure of M1 increased 20-40% with increased severity of the renal impairment (from normal to mild and moderate). The pharmacokinetics of tramadol has not been studied in patients with severe renal impairment (CL cr < 30 mL/min). The limited availability of dose strengths of Tramadol Hydrochloride Extended-Release Capsules does not permit the dosing flexibility required for safe use in patients with severe renal impairment. Therefore, Tramadol Hydrochloride Extended-Release Capsules should not be used in patients with severe renal impairment. The total amount of tramadol and M1 removed during a 4-hour dialysis period is less than 7% of the administered dose [ see Use in Specific Populations (8.6) ]. Sex Based on pooled multiple-dose pharmacokinetics studies for an extended-release tramadol product in 166 healthy subjects (111 males and 55 females), the dose-normalized AUC values for tramadol were somewhat higher in females than in males. There was a considerable degree of overlap in values between male and female groups. Dosage adjustment based on sex is not recommended. Age: Geriatric Population The effect of age on pharmacokinetics of Tramadol Hydrochloride Extended-Release Capsules has not been studied. Healthy elderly subjects aged 65 to 75 years administered an immediate-release formulation of tramadol, have plasma concentrations and elimination half-lives comparable to those observed in healthy subjects younger than 65 years of age. In subjects over 75 years, mean maximum plasma concentrations are elevated (208 vs. 162 ng/mL) and the mean elimination half-life is prolonged (7 vs. 6 hours) compared to subjects 65 to 75 years of age. Adjustment of the daily dose is recommended for patients older than 75 years [ see Dosage and Administration (2.3) ]. Drug Interaction Studies Potential for Tramadol to Affect Other Drugs In vitro studies indicate that tramadol is unlikely to inhibit the CYP3A4-mediated metabolism of other drugs when tramadol is administered concomitantly at therapeutic doses. Tramadol does not appear to induce its own metabolism in humans, since observed maximal plasma concentrations after multiple oral doses are higher than expected based on single-dose data. Poor / Extensive Metabolizers, CYP2D6 The formation of the active metabolite, M1, is mediated by CYP2D6, a polymorphic enzyme. Approximately 7% of the population has reduced activity of the CYP2D6 isoenzyme of cytochrome P-450 metabolizing enzyme system. These individuals are "poor metabolizers" of debrisoquine, dextromethorphan and tricyclic antidepressants, among other drugs. Based on a population PK analysis of Phase 1 studies with IR tablets in healthy subjects, concentrations of tramadol were approximately 20% higher in "poor metabolizers" versus "extensive metabolizers," while M1 concentrations were 40% lower. CYP2D6 Inhibitors In vitro drug interaction studies in human liver microsomes indicate that concomitant administration with inhibitors of CYP2D6 such as fluoxetine, paroxetine, and amitriptyline could result in some inhibition of the metabolism of tramadol. Quinidine Tramadol is metabolized to active metabolite M1 by CYP2D6. Coadministration of quinidine, a selective inhibitor of CYP2D6, with tramadol ER resulted in a 50-60% increase in tramadol exposure and a 50-60% decrease in M1 exposure. The clinical consequences of these findings are unknown. To evaluate the effect of tramadol, a CYP2D6 substrate on quinidine, an in vitro drug interaction study in human liver microsomes was conducted. The results from this study indicate that tramadol has no effect on quinidine metabolism [ see Warnings and Precautions (5.1 , 5.6) , Drug Interactions (7) ]. CYP3A4 Inhibitors and Inducers Since tramadol is also metabolized by CYP3A4, administration of CYP3A4 inhibitors, such as ketoconazole and erythromycin, or CYP3A4 inducers, such as rifampin and St. John's Wort, with Tramadol Hydrochloride Extended-Release Capsules may affect the metabolism of tramadol leading to altered tramadol exposure [ see Warnings and Precautions (5.1 , 5.6) , Drug Interactions (7) ]. Cimetidine Concomitant administration of tramadol immediate-release tablets with cimetidine, a weak CPY3A4 inhibitor, does not result in clinically significant changes in tramadol pharmacokinetics. No alteration of the Tramadol Hydrochloride Extended-Release Capsules dosage regimen with cimetidine is recommended. Carbamazepine Carbamazepine, a CYP3A4 inducer, increases tramadol metabolism. Patients taking carbamazepine may have a significantly reduced analgesic effect of tramadol. Concomitant administration of Tramadol Hydrochloride Extended-Release Capsules and carbamazepine is not recommended .

20221216

14

3 DOSAGE FORMS AND STRENGTHS Tramadol Hydrochloride Extended-Release Capsules are available as: 100 mg Capsules: White capsule imprinted with blue ink "G 252" on cap and "100" between lines on the body 200 mg Capsules: White capsule imprinted with violet ink "G 253" on cap and "200" between lines on the body 300 mg Capsules: White capsule imprinted with red ink "G 254" on cap and "300" between lines on the body Extended-release capsules: 100 mg, 200 mg and 300 mg ( 3 )

Tramadol Hydrochloride Extended-Release tramadol hydrochloride TRAMADOL HYDROCHLORIDE TRAMADOL SODIUM STARCH GLYCOLATE TYPE A GELATIN, UNSPECIFIED TITANIUM DIOXIDE SHELLAC FD&C BLUE NO. 2 LACTOSE MONOHYDRATE MICROCRYSTALLINE CELLULOSE SUCROSE STEARATE POVIDONE K30 STARCH, CORN MAGNESIUM STEARATE HYPROMELLOSE 2910 (6 MPA.S) TALC POLYSORBATE 80 ETHYL ACRYLATE AND METHYL METHACRYLATE COPOLYMER (2:1; 750000 MW) white G;252;100 CAPSULE Tramadol Hydrochloride Extended-Release tramadol hydrochloride TRAMADOL HYDROCHLORIDE TRAMADOL SODIUM STARCH GLYCOLATE TYPE A GELATIN, UNSPECIFIED TITANIUM DIOXIDE SHELLAC D&C RED NO. 7 LACTOSE MONOHYDRATE MICROCRYSTALLINE CELLULOSE SUCROSE STEARATE POVIDONE K30 STARCH, CORN MAGNESIUM STEARATE HYPROMELLOSE 2910 (6 MPA.S) TALC POLYSORBATE 80 ETHYL ACRYLATE AND METHYL METHACRYLATE COPOLYMER (2:1; 750000 MW) white G;253;200 CAPSULE Tramadol Hydrochloride Extended-Release tramadol hydrochloride TRAMADOL HYDROCHLORIDE TRAMADOL SODIUM STARCH GLYCOLATE TYPE A GELATIN, UNSPECIFIED TITANIUM DIOXIDE SHELLAC D&C RED NO. 7 D&C YELLOW NO. 10 LACTOSE MONOHYDRATE MICROCRYSTALLINE CELLULOSE SUCROSE STEARATE POVIDONE K30 STARCH, CORN MAGNESIUM STEARATE HYPROMELLOSE 2910 (6 MPA.S) TALC POLYSORBATE 80 ETHYL ACRYLATE AND METHYL METHACRYLATE COPOLYMER (2:1; 750000 MW) white G;254;300 CAPSULE

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis Carcinogenicity assessment has been conducted in mice, rats and p53(+/-) heterozygous mice. A slight but statistically significant increase in two common murine tumors, pulmonary and hepatic, was observed in an NMRI mouse carcinogenicity study, particularly in aged mice. Mice were dosed orally up to 30 mg/kg in the drinking water (0.5 times the maximum recommended daily human dosage or MRHD) for approximately two years, although the study was not done with the Maximum Tolerated Dose. This finding is not believed to suggest risk in humans. No evidence of carcinogenicity was noted in a rat 2-year carcinogenicity study testing oral doses of up to 30 mg/kg in the drinking water (1 times the MRHD). In a second rat study, no evidence of carcinogenicity was noted in rats at oral doses up to 75 mg/kg/day for males and 100 mg/kg/day for females (approximately 2 fold the maximum recommended human daily dose MRHD) for two years. However, the excessive decrease in body weight gain observed in the rat study might have reduced their sensitivity to any potential carcinogenic effect of the drug. No carcinogenic effect of tramadol was observed in p53(+/–)-heterozygous mice at oral doses up to 150 mg/kg/day for 26 weeks. Mutagenesis Tramadol was mutagenic in the presence of metabolic activation in the mouse lymphoma assay. Tramadol was not mutagenic in the in vitro bacterial reverse mutation assay using Salmonella and E. coli (Ames), the mouse lymphoma assay in the absence of metabolic activation, the in vitro chromosomal aberration assay, or the in vivo micronucleus assay in bone marrow. Impairment of Fertility No effects on fertility were observed for tramadol at oral dose levels up to 50 mg/kg in male rats and 75 mg/kg in female rats. These dosages are 1.2 and 1.8 times the maximum recommended human daily dose based on body surface area, respectively.

13 NON-CLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis Carcinogenicity assessment has been conducted in mice, rats and p53(+/-) heterozygous mice. A slight but statistically significant increase in two common murine tumors, pulmonary and hepatic, was observed in an NMRI mouse carcinogenicity study, particularly in aged mice. Mice were dosed orally up to 30 mg/kg in the drinking water (0.5 times the maximum recommended daily human dosage or MRHD) for approximately two years, although the study was not done with the Maximum Tolerated Dose. This finding is not believed to suggest risk in humans. No evidence of carcinogenicity was noted in a rat 2-year carcinogenicity study testing oral doses of up to 30 mg/kg in the drinking water (1 times the MRHD). In a second rat study, no evidence of carcinogenicity was noted in rats at oral doses up to 75 mg/kg/day for males and 100 mg/kg/day for females (approximately 2 fold the maximum recommended human daily dose MRHD) for two years. However, the excessive decrease in body weight gain observed in the rat study might have reduced their sensitivity to any potential carcinogenic effect of the drug. No carcinogenic effect of tramadol was observed in p53(+/–)-heterozygous mice at oral doses up to 150 mg/kg/day for 26 weeks. Mutagenesis Tramadol was mutagenic in the presence of metabolic activation in the mouse lymphoma assay. Tramadol was not mutagenic in the in vitro bacterial reverse mutation assay using Salmonella and E. coli (Ames), the mouse lymphoma assay in the absence of metabolic activation, the in vitro chromosomal aberration assay, or the in vivo micronucleus assay in bone marrow. Impairment of Fertility No effects on fertility were observed for tramadol at oral dose levels up to 50 mg/kg in male rats and 75 mg/kg in female rats. These dosages are 1.2 and 1.8 times the maximum recommended human daily dose based on body surface area, respectively.

NDA022370

Tramadol Hydrochloride Extended-Release

tramadol hydrochloride

13811-689

HUMAN PRESCRIPTION DRUG

ORAL

Principal Display Panel - 100 mg Capsule Bottle Label NDC 13811-689-30 Tramadol Hydrochloride CIV Extended-Release Capsules 100 mg per capsule Once Daily R x ONLY TRIGEN LABORATORIES 30 Capsules Principal Display Panel - 100 mg Capsule Bottle Label

Dosage and Administration ( 2.2 ) 3/2021 Warnings and Precautions ( 5.1 , 5.3 , 5.7 ) 3/2021 Warnings and Precautions ( 5.19 , 5.20 ) 9/2021

Manufactured by: Galephar P.R., Inc. Juncos, Puerto Rico 00777 Distributed by: Trigen Laboratories, LLC Alpharetta, GA 30005, USA Rev. 1/2022

17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Medication Guide) Storage and Disposal Because of the risks associated with accidental ingestion, misuse, and abuse, advise patients to store Tramadol Hydrochloride Extended-Release Capsules securely, out of sight and reach of children, and in a location not accessible by others, including visitors to the home [ see Warnings and Precautions (5.1) , Drug Abuse and Dependence (9.2) ]. Inform patients that leaving Tramadol Hydrochloride Extended-Release Capsules unsecured can pose a deadly risk to others in the home. Advise patients and caregivers that when medicines are no longer needed, they should be disposed of promptly. Inform patients that medicine take-back options are the preferred way to safely dispose of most types of unneeded medicines. If no take back programs or DEA-registered collectors are available, instruct patients to dispose of Tramadol Hydrochloride Extended-Release Capsules by following these four steps: Mix Tramadol Hydrochloride Extended-Release Capsules (do not crush) with an unpalatable substance such as dirt, cat litter, or used coffee grounds; Place the mixture in a container such as a sealed plastic bag; Throw the container in the household trash; Delete all personal information on the prescription label of the empty bottle Inform patients that they can visit www.fda.gov/drugdisposal for additional information on disposal of unused medicines. Addiction, Abuse, and Misuse Inform patients that the use of Tramadol Hydrochloride Extended-Release Capsules even when taken as recommended, can result in addiction, abuse, and misuse, which can lead to overdose and death [ see Warnings and Precautions (5.1) ]. Instruct patients not to share Tramadol Hydrochloride Extended-Release Capsules with others and to take steps to protect Tramadol Hydrochloride Extended-Release Capsules from theft or misuse. Life-Threatening Respiratory Depression Inform patients of the risk of life-threatening respiratory depression, including information that the risk is greatest when starting Tramadol Hydrochloride Extended-Release Capsules or when the dosage is increased, and that it can occur even at recommended dosages. Educate patients and caregivers on how to recognize respiratory depression and emphasize the importance of calling 911 or getting emergency medical help right away in the event of a known or suspected overdose [ see Warnings and Precautions (5.3) ]. Patient Access to Naloxone for the Emergency Treatment of Opioid Overdose Discuss with the patient and caregiver the availability of naloxone for the emergency treatment of opioid overdose, both when initiating and renewing treatment with Tramadol Hydrochloride Extended-Release Capsules. Inform patients and caregivers about the various ways to obtain naloxone as permitted by individual state naloxone dispensing and prescribing requirements or guidelines (e.g., by prescription, directly from a pharmacist, or as part of a community-based program) [ see Dosage and Administration (2.2) , Warnings and Precautions (5.3) ]. Educate patients and caregivers on how to recognize the signs and symptoms of an overdose. Explain to patients and caregivers that naloxone's effects are temporary, and that they must call 911 or get emergency medical help right away in all cases of known or suspected opioid overdose, even if naloxone is administered [ see Overdosage (10) ]. If naloxone is prescribed, also advise patients and caregivers: How to treat with naloxone in the event of an opioid overdose To tell family and friends about their naloxone and to keep it in a place where family and friends can access it in an emergency To read the Patient Information (or other educational material) that will come with their naloxone. Emphasize the importance of doing this before an opioid emergency happens, so the patient and caregiver will know what to do Accidental Ingestion Inform patients that accidental ingestion, especially by children, may result in respiratory depression or death [ see Warnings and Precautions (5.3) ]. Instruct patients to take steps to store Tramadol Hydrochloride Extended-Release Capsules securely and to dispose of unused Tramadol Hydrochloride Extended-Release Capsules in accordance with the local state guidelines and/or regulations. Ultra-Rapid Metabolism of Tramadol and Other Risk Factors for Life-Threatening Respiratory Depression in Children Advise caregivers that Tramadol Hydrochloride Extended-Release Capsules are contraindicated in all children younger than 12 years of age and in children younger than 18 years of age following tonsillectomy and/or adenoidectomy. Advise caregivers of children ages 12 to18 years of age receiving Tramadol Hydrochloride Extended-Release Capsules to monitor for signs of respiratory depression [ see Warnings and Precautions (5.4) ]. Interactions with Benzodiazepines and Other CNS Depressants Inform patients and caregivers that potentially fatal additive effects may occur if Tramadol Hydrochloride Extended-Release Capsules are used with benzodiazepines or other CNS depressants, including alcohol, and not to use these concomitantly unless supervised by a healthcare provider [ see Warnings and Precautions (5.7) , Drug Interactions (7) ]. Serotonin Syndrome Inform patients that tramadol could cause a rare but potentially life-threatening condition, particularly during concomitant use with serotonergic drugs. Warn patients of the symptoms of serotonin syndrome and to seek medical attention right away if symptoms develop. Instruct patients to inform their healthcare provider if they are taking, or plan to take serotonergic medications [ see Warnings and Precautions (5.8) , Drug Interactions (7) ]. Seizures Inform patients that Tramadol Hydrochloride Extended-Release Capsules may cause seizures with concomitant use of serotonergic agents (including SSRIs, SNRIs, and triptans) or drugs that significantly reduce the metabolic clearance of tramadol [ see Warnings and Precautions (5.9) ]. MAOI Interaction Inform patients not to take Tramadol Hydrochloride Extended-Release Capsules while using any drugs that inhibit monoamine oxidase. Patients should not start MAOIs while taking Tramadol Hydrochloride Extended-Release Capsules [ see Drug Interactions (7) ]. Adrenal Insufficiency Inform patients that opioids could cause adrenal insufficiency, a potentially life-threatening condition. Adrenal insufficiency may present with non-specific symptoms and signs such as nausea, vomiting, anorexia, fatigue, weakness, dizziness, and low blood pressure. Advise patients to seek medical attention if they experience a constellation of these symptoms [ see Warnings and Precautions (5.11) ]. Important Administration Instructions Instruct patients how to properly take Tramadol Hydrochloride Extended-Release Capsules, including the following: Tramadol Hydrochloride Extended-Release Capsules are designed to work properly only if swallowed intact. Taking cut, broken, chewed, crushed, or dissolved Tramadol Hydrochloride Extended-Release Capsules can result in a fatal overdose [ see Dosage and Administration (2.1) ]. Advise patients not to exceed the single-dose and 24-hour dose limit and the time interval between doses, since exceeding these recommendations can result in respiratory depression, seizures, hepatic toxicity, and death. Tramadol Hydrochloride Extended-Release Capsules should not be taken with alcohol containing beverages. Important Discontinuation Instructions In order to avoid developing withdrawal symptoms, instruct patients not to discontinue Tramadol Hydrochloride Extended-Release Capsules without first discussing a tapering plan with the prescriber [ see Dosage and Administration (2.5) ]. Hypotension Inform patients that Tramadol Hydrochloride Extended-Release Capsules may cause orthostatic hypotension and syncope. Instruct patients how to recognize symptoms of low blood pressure and how to reduce the risk of serious consequences should hypotension occur (e.g., sit or lie down, carefully rise from a sitting or lying position) [ see Warnings and Precautions (5.13) ]. Anaphylaxis Inform patients that anaphylaxis has been reported with ingredients contained in Tramadol Hydrochloride Extended-Release Capsules. Advise patients how to recognize such a reaction and when to seek medical attention [ see Contraindications (4) , Adverse Reactions (6) ]. Pregnancy Neonatal Opioid Withdrawal Syndrome Inform female patients of reproductive potential that prolonged use of Tramadol Hydrochloride Extended-Release Capsules during pregnancy can result in neonatal opioid withdrawal syndrome, which may be life-threatening if not recognized and treated [ see Warnings and Precautions (5.5) , Use in Specific Populations (8.1) ]. Embryo-Fetal Toxicity Inform female patients of reproductive potential that Tramadol Hydrochloride Extended-Release Capsules can cause fetal harm and to inform their healthcare provider of a known or suspected pregnancy [ see Use in Specific Populations (8.1) ]. Lactation Advise women that breastfeeding is not recommended during treatment with Tramadol Hydrochloride Extended-Release Capsules [ see Use in Specific Populations (8.2) ]. Infertility Inform patients that chronic use of opioids may cause reduced fertility. It is not known whether these effects on fertility are reversible [ see Adverse Reactions (6.2) , Use in Specific Populations (8.3) ]. Driving or Operating Heavy Machinery Inform patients that Tramadol Hydrochloride Extended-Release Capsules may impair the ability to perform potentially hazardous activities such as driving a car or operating heavy machinery. Advise patients not to perform such tasks until they know how they will react to the medication [ see Warnings and Precautions (5.18) ]. Constipation Advise patients of the potential for severe constipation, including management instructions and when to seek medical attention [ see Adverse Reactions (6) , Clinical Pharmacology (12.1) ].

This Medication Guide has been approved by the U.S. Food and Drug Administration. Issued: 1/2022 Medication Guide Tramadol Hydrochloride Extended-Release Capsules , CIV Tramadol Hydrochloride Extended-Release Capsules are: A strong prescription pain medicine that contains an opioid (narcotic) that is used to manage pain severe enough to require daily around-the-clock, long-term treatment with an opioid, when other pain treatments such as non-opioid pain medicines or immediate-release opioid medicines do not treat your pain well enough or you cannot tolerate them. A long-acting (extended-release) opioid pain medicine that can put you at risk for overdose and death. Even if you take your dose correctly as prescribed you are at risk for opioid addiction, abuse, and misuse that can lead to death. Not for use to treat pain that is not around-the-clock. Important information about Tramadol Hydrochloride Extended-Release Capsules: Get emergency help right away or call 911 right away if you take too much Tramadol Hydrochloride Extended-Release Capsules (overdose) . When you first start taking Tramadol Hydrochloride Extended-Release Capsules, when your dose is changed, or if you take too much (overdose), serious or life-threatening breathing problems that can lead to death may occur. Talk to your healthcare provider about naloxone, a medicine for the emergency treatment of an opioid overdose. Taking Tramadol Hydrochloride Extended-Release Capsules with other opioid medicines, benzodiazepines, alcohol, or other central nervous system depressants (including street drugs) can cause severe drowsiness, decreased awareness, breathing problems, coma, and death. Never give anyone else your Tramadol Hydrochloride Extended-Release Capsules. They could die from taking it. Selling or giving away Tramadol Hydrochloride Extended-Release Capsules is against the law. Store Tramadol Hydrochloride Extended-Release Capsules securely, out of sight and reach of children, and in a location not accessible by others, including visitors to the home. Important Information Guiding Use in Pediatric Patients: Do not give Tramadol Hydrochloride Extended-Release Capsules to a child younger than 12 years of age. Do not give Tramadol Hydrochloride Extended-Release Capsules to a child younger than 18 years of age after surgery to remove the tonsils and/or adenoids. Avoid giving Tramadol Hydrochloride Extended-Release Capsules to children between 12 to 18 years of age who have risk factors for breathing problems such as obstructive sleep apnea, obesity, or underlying lung problems. Do not take Tramadol Hydrochloride Extended-Release Capsules if you have: severe asthma, trouble breathing, or other lung problems. a bowel blockage or have narrowing of the stomach or intestines. Before taking Tramadol Hydrochloride Extended-Release Capsules, tell your healthcare provider if you have a history of: head injury, seizures problems urinating liver, kidney, thyroid problems pancreas or gallbladder problems abuse of street or prescription drugs, alcohol addiction, opioid overdose, or mental health problems. Tell your healthcare provider if you are: pregnant or planning to become pregnant. Prolonged use of Tramadol Hydrochloride Extended-Release Capsules during pregnancy can cause withdrawal symptoms in your newborn baby that could be life-threatening if not recognized and treated. breastfeeding. Not recommended; it may harm your baby. living in a household where there are small children or someone who has abused street or prescription drugs. taking prescription or over-the-counter medicines, vitamins, or herbal supplements. Taking Tramadol Hydrochloride Extended-Release Capsules with certain other medicines can cause serious side effects that could lead to death. When taking Tramadol Hydrochloride Extended-Release Capsules: Do not change your dose. Take Tramadol Hydrochloride Extended-Release Capsules exactly as prescribed by your healthcare provider. Use the lowest dose possible for the shortest time needed. Take your prescribed dose once a day at the same time every day. Do not take more than your prescribed dose. If you miss a dose, take your next dose at your usual time. Swallow Tramadol Hydrochloride Extended-Release Capsules whole. Do not split, break, chew, crush, dissolve, snort, or inject Tramadol Hydrochloride Extended-Release Capsules because this may cause you to overdose and die. Call your healthcare provider if the dose you are taking does not control your pain. Do not stop taking Tramadol Hydrochloride Extended-Release Capsules without talking to your healthcare provider. Dispose of expired, unwanted, or unused Tramadol Hydrochloride Extended-Release Capsules by taking your drug to an authorized DEA-registered collector or drug take-back program. If one is not available, you can dispose of Tramadol Hydrochloride Extended-Release Capsules by mixing the product with dirt, cat litter, or coffee grounds; placing the mixture in a sealed plastic bag and throwing the bag in your trash. While taking Tramadol Hydrochloride Extended-Release Capsules DO NOT: Drive or operate heavy machinery, until you know how Tramadol Hydrochloride Extended-Release Capsules affect you. Tramadol Hydrochloride Extended-Release Capsules can make you sleepy, dizzy, or lightheaded. Drink alcohol or use prescription or over-the-counter medicines that contain alcohol. Using products containing alcohol during treatment with Tramadol Hydrochloride Extended-Release Capsules may cause you to overdose and die. The possible side effects of Tramadol Hydrochloride Extended-Release Capsules: constipation, nausea, sleepiness, vomiting, tiredness, headache, dizziness, abdominal pain, seizure. Call your healthcare provider if you have any of these symptoms and they are severe. Get emergency medical help or call 911 right away if you have: trouble breathing, shortness of breath, fast heartbeat, chest pain, swelling of your face, tongue, or throat, extreme drowsiness, light-headedness when changing positions, feeling faint, agitation, high body temperature, trouble walking, stiff muscles, or mental changes such as confusion. These are not all the possible side effects of Tramadol Hydrochloride Extended-Release Capsules. Call your doctor for medical advice about side effects. You may report side effects to Trigen Laboratories, LLC at 1-877-482-3788 or FDA at 1-800-FDA-1088. For more information go to dailymed.nlm.nih.gov Distributed by: Trigen Laboratories, LLC, Alpharetta, GA 30005, USA, call 1-877-482-3788

14 CLINICAL STUDIES Tramadol Hydrochloride Extended-Release Capsules are bioequivalent under fasting conditions to another extended-release tramadol product [ see Clinical Pharmacology (12.3) ] which demonstrated efficacy in two of four clinical trials of patients with chronic pain. To qualify for inclusion into these studies, patients were required to have moderate to moderately severe pain as defined by a pain intensity score of ≥40 mm, off previous medications, on a 0 - 100 mm visual analog scale (VAS). In one 12-week randomized, double-blind, placebo-controlled study, patients with moderate to moderately severe pain due to osteoarthritis of the knee and/or hip were administered doses from 100 mg to 400 mg daily. Treatment with the extended-release tramadol product was initiated at 100 mg once daily for four days then increased by 100 mg per day increments every five days to the randomized fixed dose. Between 51% and 59% of patients in active treatment groups completed the study and 56% of patients in the placebo group completed the study. Discontinuations due to adverse events were more common in the extended-release tramadol product 200 mg, 300 mg and 400 mg treatment groups (20%, 27%, and 30% of discontinuations, respectively) compared to 14% of the patients treated with the extended-release tramadol product 100 mg and 10% of patients treated with placebo. Pain, as assessed by the WOMAC Pain subscale, was measured at 1, 2, 3, 6, 9, and 12 weeks and change from baseline assessed. A responder analysis based on the percent change in WOMAC Pain subscale demonstrated a statistically significant improvement in pain for the 100 mg and 200 mg treatment groups compared to placebo (see Figure 2 ). Figure 2 In one 12-week randomized, double-blind, placebo-controlled flexible-dosing trial of the extended-release tramadol product in patients with osteoarthritis of the knee, patients titrated to an average daily dose of approximately 270 mg/day. Forty-nine percent of patients randomized to the active treatment group completed the study, while 52% of patients randomized to placebo completed the study. Most of the early discontinuations in the active treatment group were due to adverse events, accounting for 27% of the early discontinuations in contrast to 7% of the discontinuations from the placebo group. Thirty-seven percent of the placebo-treated patients discontinued the study due to lack of efficacy compared to 15% of active-treated patients. The active treatment group demonstrated a statistically significant decrease in the mean Visual Analog Scale (VAS) score, and a statistically significant difference in the responder rate, based on the percent change from baseline in the VAS score, measured at 1, 2, 4, 8, and 12 weeks, between patients receiving the extended-release tramadol product and placebo (see Figure 3 ). Figure 3 Four randomized, placebo-controlled clinical trials of Tramadol Hydrochloride Extended-Release Capsules were conducted, none of which demonstrated efficacy but which differed in design from the preceding clinical studies described. Two trials were 12-week randomized placebo-controlled trials of Tramadol Hydrochloride Extended-Release Capsules 100 mg/day, 200 mg/day, and 300 mg/day versus placebo in patients with moderate to moderately severe osteoarthritis pain of the hip and knee. The other two 12 week trials were similar in design, but only studied Tramadol Hydrochloride Extended-Release Capsules 300 mg/day. In this fixed-dose design, subjects were required to titrate to a fixed dose, even if their pain responded to a lower titration dose. Figure 2 Figure 3

8.5 Geriatric Use Eight hundred and twelve elderly (65 years of age or older) subjects were exposed to Tramadol Hydrochloride Extended-Release Capsules in clinical trials. Of those subjects, two hundred and forty were 75 years of age and older. In general, higher incidence rates of adverse events were observed for patients older than 65 years of age compared with patients 65 years and younger, particularly for the following adverse events: nausea, constipation, somnolence, dizziness, dry mouth, vomiting, asthenia, pruritus, anorexia, sweating, fatigue, weakness, postural hypotension and dyspepsia. For this reason, Tramadol Hydrochloride Extended-Release Capsules should be used with great caution in patients older than 75 years of age [ see Dosage and Administration (2.3) ]. Respiratory depression is the chief risk for elderly patients treated with opioids, and has occurred after large initial doses were administered to patients who were not opioid-tolerant or when opioids were co-administered with other agents that depress respiration. Titrate the dosage of Tramadol Hydrochloride Extended-Release Capsules slowly in geriatric patients and monitor closely for signs of central nervous system and respiratory depression [ see Warnings and Precautions (5.3) ]. Tramadol is known to be substantially excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.

8.4 Pediatric Use The safety and effectiveness of Tramadol Hydrochloride Extended-Release Capsules in pediatric patients have not been established. Life-threatening respiratory depression and death have occurred in children who received tramadol [ see Warnings and Precautions (5.4) ]. In some of the reported cases, these events followed tonsillectomy and/or adenoidectomy, and one of the children had evidence of being an ultra-rapid metabolizer of tramadol (i.e., multiple copies of the gene for cytochrome P450 isoenzyme 2D6). Children with sleep apnea may be particularly sensitive to the respiratory depressant effects of tramadol. Because of the risk of life-threatening respiratory depression and death: Tramadol Hydrochloride Extended-Release Capsules are contraindicated for all children younger than 12 years of age [ see Contraindications (4) ]. Tramadol Hydrochloride Extended-Release Capsules are contraindicated for post-operative management in pediatric patients younger than 18 years of age following tonsillectomy and/or adenoidectomy [ see Contraindications (4) ]. Avoid the use of Tramadol Hydrochloride Extended-Release Capsules in adolescents 12 to 18 years of age who have other risk factors that may increase their sensitivity to the respiratory depressant effects of tramadol unless the benefits outweigh the risks. Risk factors include conditions associated with hypoventilation, such as postoperative status, obstructive sleep apnea, obesity, severe pulmonary disease, neuromuscular disease, and concomitant use of other medications that cause respiratory depression [ see Warnings and Precautions (5.4) ].

8.1 Pregnancy Risk Summary Prolonged use of opioid analgesics during pregnancy may cause neonatal opioid withdrawal syndrome [ see Warnings and Precautions (5.5) ]. Available data with Tramadol Hydrochloride Extended-Release Capsules in pregnant women are insufficient to inform a drug-associated risk for major birth defects and miscarriage. In animal reproduction studies, tramadol administration during organogenesis decreased fetal weights and reduced ossification in mice, rats, and rabbits at 1.4, 0.6, and 3.6 times the maximum recommended human daily dosage (MRHD). Tramadol decreased pup body weight and increased pup mortality at 1.2 and 1.9 times the MRHD [see Data ] . Based on animal data, advise pregnant women of the potential risk to a fetus. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively. Clinical Considerations Fetal/Neonatal Adverse Reactions Prolonged use of opioid analgesics during pregnancy for medical or nonmedical purposes can result in physical dependence in the neonate and neonatal opioid withdrawal syndrome shortly after birth. Neonatal opioid withdrawal syndrome presents as irritability, hyperactivity and abnormal sleep pattern, high pitched cry, tremor, vomiting, diarrhea, and failure to gain weight. The onset, duration, and severity of neonatal opioid withdrawal syndrome vary based on the specific opioid used, duration of use, timing and amount of last maternal use, and rate of elimination of the drug by the newborn. Observe newborns for symptoms of neonatal opioid withdrawal syndrome and manage accordingly [ see Warnings and Precautions (5.5) ]. Neonatal seizures, neonatal withdrawal syndrome, fetal death and still birth have been reported with tramadol during post-approval use of tramadol immediate-release products. Labor or Delivery Opioids cross the placenta and may produce respiratory depression and psycho-physiologic effects in neonates. An opioid antagonist, such as naloxone, must be available for reversal of opioid-induced respiratory depression in the neonate. Tramadol Hydrochloride Extended-Release Capsules are not recommended for use in pregnant women during or immediately prior to labor, when use of shorter-acting analgesics or other analgesic techniques are more appropriate. Opioid analgesics, including Tramadol Hydrochloride Extended-Release Capsules can prolong labor through actions which temporarily reduce the strength, duration, and frequency of uterine contractions. However, this effect is not consistent and may be offset by an increased rate of cervical dilation, which tends to shorten labor. Monitor neonates exposed to opioid analgesics during labor for signs of excess sedation and respiratory depression. Tramadol has been shown to cross the placenta. The mean ratio of serum tramadol in the umbilical veins compared to maternal veins was 0.83 for 40 women given tramadol during labor. The effect of Tramadol Hydrochloride Extended-Release Capsules, if any, on the later growth, development, and functional maturation of the child is unknown. Data Animal Data Tramadol has been shown to be embryotoxic and fetotoxic in mice, (120 mg/kg), rats (25 mg/kg) and rabbits (75 mg/kg) at maternally toxic dosages, but was not teratogenic at these dose levels. These doses on a mg/m 2 basis are 1.9, 0.8, and 4.9 times the maximum recommended human daily dosage (MRHD) for mouse, rat and rabbit, respectively. No drug-related teratogenic effects were observed in progeny of mice (up to 140 mg/kg), rats (up to 80 mg/kg) or rabbits (up to 300 mg/kg) treated with tramadol by various routes. Embryo and fetal toxicity consisted primarily of decreased fetal weights, decreased skeletal ossification, and increased supernumerary ribs at maternally toxic dose levels. Transient delays in developmental or behavioral parameters were also seen in pups from rat dams allowed to deliver. Embryo and fetal lethality were reported only in one rabbit study at 300 mg/kg, a dose that would cause extreme maternal toxicity in the rabbit. The dosages listed for mouse, rat, and rabbit are 2.3, 2.6, and 19 times the MRHD, respectively. Tramadol was evaluated in pre- and post-natal studies in rats. Progeny of dams receiving oral (gavage) dose levels of 50 mg/kg (1.6 times the MRHD) or greater had decreased weights, and pup survival was decreased early in lactation at 80 mg/kg (2.6 times the MRHD).

8 USE IN SPECIFIC POPULATIONS Pregnancy : May cause fetal harm. ( 8.1 ) Lactation : Breastfeeding not recommended. ( 8.2 ) Severe Hepatic or Renal Impairment : Use not recommended. ( 8.6 , 8.7 ) 8.1 Pregnancy Risk Summary Prolonged use of opioid analgesics during pregnancy may cause neonatal opioid withdrawal syndrome [ see Warnings and Precautions (5.5) ]. Available data with Tramadol Hydrochloride Extended-Release Capsules in pregnant women are insufficient to inform a drug-associated risk for major birth defects and miscarriage. In animal reproduction studies, tramadol administration during organogenesis decreased fetal weights and reduced ossification in mice, rats, and rabbits at 1.4, 0.6, and 3.6 times the maximum recommended human daily dosage (MRHD). Tramadol decreased pup body weight and increased pup mortality at 1.2 and 1.9 times the MRHD [see Data ] . Based on animal data, advise pregnant women of the potential risk to a fetus. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively. Clinical Considerations Fetal/Neonatal Adverse Reactions Prolonged use of opioid analgesics during pregnancy for medical or nonmedical purposes can result in physical dependence in the neonate and neonatal opioid withdrawal syndrome shortly after birth. Neonatal opioid withdrawal syndrome presents as irritability, hyperactivity and abnormal sleep pattern, high pitched cry, tremor, vomiting, diarrhea, and failure to gain weight. The onset, duration, and severity of neonatal opioid withdrawal syndrome vary based on the specific opioid used, duration of use, timing and amount of last maternal use, and rate of elimination of the drug by the newborn. Observe newborns for symptoms of neonatal opioid withdrawal syndrome and manage accordingly [ see Warnings and Precautions (5.5) ]. Neonatal seizures, neonatal withdrawal syndrome, fetal death and still birth have been reported with tramadol during post-approval use of tramadol immediate-release products. Labor or Delivery Opioids cross the placenta and may produce respiratory depression and psycho-physiologic effects in neonates. An opioid antagonist, such as naloxone, must be available for reversal of opioid-induced respiratory depression in the neonate. Tramadol Hydrochloride Extended-Release Capsules are not recommended for use in pregnant women during or immediately prior to labor, when use of shorter-acting analgesics or other analgesic techniques are more appropriate. Opioid analgesics, including Tramadol Hydrochloride Extended-Release Capsules can prolong labor through actions which temporarily reduce the strength, duration, and frequency of uterine contractions. However, this effect is not consistent and may be offset by an increased rate of cervical dilation, which tends to shorten labor. Monitor neonates exposed to opioid analgesics during labor for signs of excess sedation and respiratory depression. Tramadol has been shown to cross the placenta. The mean ratio of serum tramadol in the umbilical veins compared to maternal veins was 0.83 for 40 women given tramadol during labor. The effect of Tramadol Hydrochloride Extended-Release Capsules, if any, on the later growth, development, and functional maturation of the child is unknown. Data Animal Data Tramadol has been shown to be embryotoxic and fetotoxic in mice, (120 mg/kg), rats (25 mg/kg) and rabbits (75 mg/kg) at maternally toxic dosages, but was not teratogenic at these dose levels. These doses on a mg/m 2 basis are 1.9, 0.8, and 4.9 times the maximum recommended human daily dosage (MRHD) for mouse, rat and rabbit, respectively. No drug-related teratogenic effects were observed in progeny of mice (up to 140 mg/kg), rats (up to 80 mg/kg) or rabbits (up to 300 mg/kg) treated with tramadol by various routes. Embryo and fetal toxicity consisted primarily of decreased fetal weights, decreased skeletal ossification, and increased supernumerary ribs at maternally toxic dose levels. Transient delays in developmental or behavioral parameters were also seen in pups from rat dams allowed to deliver. Embryo and fetal lethality were reported only in one rabbit study at 300 mg/kg, a dose that would cause extreme maternal toxicity in the rabbit. The dosages listed for mouse, rat, and rabbit are 2.3, 2.6, and 19 times the MRHD, respectively. Tramadol was evaluated in pre- and post-natal studies in rats. Progeny of dams receiving oral (gavage) dose levels of 50 mg/kg (1.6 times the MRHD) or greater had decreased weights, and pup survival was decreased early in lactation at 80 mg/kg (2.6 times the MRHD). 8.2 Lactation Risk Summary Tramadol Hydrochloride Extended-Release Capsules are not recommended for obstetrical preoperative medication or for post-delivery analgesia in nursing mothers because its safety in infants and newborns has not been studied. Tramadol and its metabolite, O-desmethyltramadol (M1), are present in human milk. There is no information on the effects of the drug on the breastfed infant or the effects of the drug on milk production. The M1 metabolite is more potent than tramadol in mu-opioid receptor binding [ see Clinical Pharmacology (12.1) ]. Published studies have reported tramadol and M1 in colostrum with administration of tramadol to nursing mothers in the early post-partum period . Women who are ultra-rapid metabolizers of tramadol may have higher than expected serum levels of M1, potentially leading to higher levels of M1 in breast milk that can be dangerous in their breastfed infants. In women with normal tramadol metabolism, the amount of tramadol secreted into human milk is low and dose-dependent. Because of the potential for serious adverse reactions, including excess sedation and respiratory depression in a breastfed infant, advise patients that breastfeeding is not recommended during treatment with Tramadol Hydrochloride Extended-Release Capsules. Clinical Considerations If infants are exposed to Tramadol Hydrochloride Extended-Release Capsules through breast milk, they should be monitored for excess sedation and respiratory depression. Withdrawal symptoms can occur in breastfed infants when maternal administration of an opioid analgesic is stopped, or when breast-feeding is stopped. Data Following a single IV 100 mg dose of tramadol, the cumulative excretion in breast milk within 16 hours post dose was 100 mcg of tramadol (0.1% of the maternal dose) and 27 mcg of M1. 8.3 Females and Males of Reproductive Potential Infertility Chronic use of opioids may cause reduced fertility in females and males of reproductive potential. It is not known whether these effects on fertility are reversible [ see Adverse Reactions (6.2) , Clinical Pharmacology (12.2) , Nonclinical Toxicology (13.1) ]. 8.4 Pediatric Use The safety and effectiveness of Tramadol Hydrochloride Extended-Release Capsules in pediatric patients have not been established. Life-threatening respiratory depression and death have occurred in children who received tramadol [ see Warnings and Precautions (5.4) ]. In some of the reported cases, these events followed tonsillectomy and/or adenoidectomy, and one of the children had evidence of being an ultra-rapid metabolizer of tramadol (i.e., multiple copies of the gene for cytochrome P450 isoenzyme 2D6). Children with sleep apnea may be particularly sensitive to the respiratory depressant effects of tramadol. Because of the risk of life-threatening respiratory depression and death: Tramadol Hydrochloride Extended-Release Capsules are contraindicated for all children younger than 12 years of age [ see Contraindications (4) ]. Tramadol Hydrochloride Extended-Release Capsules are contraindicated for post-operative management in pediatric patients younger than 18 years of age following tonsillectomy and/or adenoidectomy [ see Contraindications (4) ]. Avoid the use of Tramadol Hydrochloride Extended-Release Capsules in adolescents 12 to 18 years of age who have other risk factors that may increase their sensitivity to the respiratory depressant effects of tramadol unless the benefits outweigh the risks. Risk factors include conditions associated with hypoventilation, such as postoperative status, obstructive sleep apnea, obesity, severe pulmonary disease, neuromuscular disease, and concomitant use of other medications that cause respiratory depression [ see Warnings and Precautions (5.4) ]. 8.5 Geriatric Use Eight hundred and twelve elderly (65 years of age or older) subjects were exposed to Tramadol Hydrochloride Extended-Release Capsules in clinical trials. Of those subjects, two hundred and forty were 75 years of age and older. In general, higher incidence rates of adverse events were observed for patients older than 65 years of age compared with patients 65 years and younger, particularly for the following adverse events: nausea, constipation, somnolence, dizziness, dry mouth, vomiting, asthenia, pruritus, anorexia, sweating, fatigue, weakness, postural hypotension and dyspepsia. For this reason, Tramadol Hydrochloride Extended-Release Capsules should be used with great caution in patients older than 75 years of age [ see Dosage and Administration (2.3) ]. Respiratory depression is the chief risk for elderly patients treated with opioids, and has occurred after large initial doses were administered to patients who were not opioid-tolerant or when opioids were co-administered with other agents that depress respiration. Titrate the dosage of Tramadol Hydrochloride Extended-Release Capsules slowly in geriatric patients and monitor closely for signs of central nervous system and respiratory depression [ see Warnings and Precautions (5.3) ]. Tramadol is known to be substantially excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function. 8.6 Hepatic Impairment Metabolism of tramadol and M1 is reduced in patients with advanced cirrhosis of the liver. Tramadol Hydrochloride Extended-Release Capsules have not been studied in patients with hepatic impairment. The limited availability of dose strengths of Tramadol Hydrochloride Extended-Release Capsules does not permit the dosing flexibility required for safe use in patients with severe hepatic impairment (Child-Pugh Class C). Therefore, Tramadol Hydrochloride Extended-Release Capsules should not be used in patients with severe hepatic impairment [ see Clinical Pharmacology (12.3) ]. 8.7 Renal Impairment Tramadol Hydrochloride Extended-Release Capsules have not been studied in patients with renal impairment. Impaired renal function results in a decreased rate and extent of excretion of tramadol and its active metabolite, M1. The limited availability of dose strengths of Tramadol Hydrochloride Extended-Release Capsules does not permit the dosing flexibility required for safe use in patients with severe renal impairment (Child-Pugh Class C). Therefore, Tramadol Hydrochloride Extended-Release Capsules should not be used in patients with severe renal impairment [ see Clinical Pharmacology (12.3) ].

16 HOW SUPPLIED/STORAGE AND HANDLING Tramadol Hydrochloride Extended-Release Capsules are supplied as opaque white hard gelatin capsules, imprinted as follows. 100 mg Capsules: White capsule imprinted with blue ink "G 252" on cap and "100" between lines on the body Bottle of 30 capsules: NDC 13811-689-30 200 mg Capsules: White capsule imprinted with violet ink "G 253" on cap and "200" between lines on the body Bottle of 30 capsules: NDC 13811-690-30 300 mg Capsules: White capsule imprinted with red ink "G 254" on cap and "300" between lines on the body Bottle of 30 capsules: NDC 13811-691-30 Dispense in a tight container. Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [ see USP Controlled Room Temperature ]. Keep out of reach of children. Store Tramadol Hydrochloride Extended-Release Capsules securely and dispose of properly [ see Patient Counseling Information (17) ].

Dispense in a tight container. Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [ see USP Controlled Room Temperature ]. Keep out of reach of children. Store Tramadol Hydrochloride Extended-Release Capsules securely and dispose of properly [ see Patient Counseling Information (17) ].

WARNING: ADDICTION, ABUSE, AND MISUSE; RISK EVALUATION AND MITIGATION STRATEGY (REMS); LIFE-THREATENING RESPIRATORY DEPRESSION; ACCIDENTAL INGESTION; ULTRA-RAPID METABOLISM OF TRAMADOL AND OTHER RISK FACTORS FOR LIFE-THREATENING RESPIRATORY DEPRESSION IN CHILDREN; NEONATAL OPIOID WITHDRAWAL SYNDROME; INTERACTIONS WITH DRUGS AFFECTING CYTOCHROME P450 ISOENZYMES; and RISKS FROM CONCOMITANT USE WITH BENZODIAZEPINES OR OTHER CNS DEPRESSANTS WARNING: ADDICTION, ABUSE, AND MISUSE; RISK EVALUATION AND MITIGATION STRATEGY (REMS); LIFE-THREATENING RESPIRATORY DEPRESSION; ACCIDENTAL INGESTION; ULTRA-RAPID METABOLISM OF TRAMADOL AND OTHER RISK FACTORS FOR LIFE-THREATENING RESPIRATORY DEPRESSION IN CHILDREN; NEONATAL OPIOID WITHDRAWAL SYNDROME; INTERACTIONS WITH DRUGS AFFECTING CYTOCHROME P450 ISOENZYMES; and RISKS FROM CONCOMITANT USE WITH BENZODIAZEPINES OR OTHER CNS DEPRESSANTS See full prescribing information for complete boxed warning. Tramadol Hydrochloride Extended-Release Capsules expose users to risks of addiction, abuse, and misuse, which can lead to overdose and death. Assess patient's risk before prescribing and monitor regularly for these behaviors and conditions. ( 5.1 ) To ensure that the benefits of opioid analgesics outweigh the risks of addiction, abuse, and misuse, the Food and Drug Administration (FDA) has required a Risk Evaluation and Mitigation Strategy (REMS) for these products. ( 5.2 ) Serious, life-threatening, or fatal respiratory depression may occur. Monitor closely, especially upon initiation or following a dose increase. Instruct patients to swallow Tramadol Hydrochloride Extended-Release Capsules intact, and not to split, chew, crush, or dissolve content of the capsules to avoid exposure to a potentially fatal dose of tramadol. ( 5.3 ) Accidental ingestion of Tramadol Hydrochloride Extended-Release Capsules, especially by children, can result in a fatal overdose of tramadol. ( 5.3 ) Life-threatening respiratory depression and death have occurred in children who received tramadol. Some of the reported cases followed tonsillectomy and/or adenoidectomy; in at least one case, the child had evidence of being an ultra-rapid metabolizer of tramadol due to a CYP2D6 polymorphism. ( 5.4 ) Tramadol Hydrochloride Extended-Release Capsules are contraindicated in children younger than 12 years of age and in children younger than 18 years of age following tonsillectomy and/or adenoidectomy. ( 4 ) Avoid the use of Tramadol Hydrochloride Extended-Release Capsules in adolescents 12 to 18 years of age who have other risk factors that may increase their sensitivity to the respiratory depressant effects of tramadol. ( 5.4 ) Prolonged use of Tramadol Hydrochloride Extended-Release Capsules during pregnancy can result in neonatal opioid withdrawal syndrome, which may be life-threatening if not recognized and treated. If prolonged opioid use is required in a pregnant woman, advise the patient of the risk of neonatal opioid withdrawal syndrome and ensure that appropriate treatment will be available. ( 5.5 ) The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with tramadol are complex. Use of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with Tramadol Hydrochloride Extended-Release Capsules requires careful consideration of the effects on the parent drug, tramadol, and the active metabolite, M1. ( 5.6 , 7 ) Concomitant use of opioids with benzodiazepines or other central nervous system (CNS) depressants, including alcohol, may result in profound sedation, respiratory depression, coma, and death. Reserve concomitant prescribing for use in patients for whom alternative treatment options are inadequate; limit dosages and durations to the minimum required; and follow patients for signs and symptoms of respiratory depression and sedation. ( 5.7 , 7 ) Addiction, Abuse, and Misuse Tramadol Hydrochloride Extended-Release Capsules expose patients and other users to the risks of opioid addiction, abuse, and misuse, which can lead to overdose and death. Assess each patient's risk prior to prescribing Tramadol Hydrochloride Extended-Release Capsules and monitor all patients regularly for the development of these behaviors and conditions [ see Warnings and Precautions (5.1) ]. Opioid Analgesic Risk Evaluation and Mitigation Strategy (REMS): To ensure that the benefits of opioid analgesics outweigh the risks of addiction, abuse, and misuse, the Food and Drug Administration (FDA) has required a REMS for these products [ see Warnings and Precautions (5.2) ]. Under the requirements of the REMS, drug companies with approved opioid analgesic products must make REMS-compliant education programs available to healthcare providers. Healthcare providers are strongly encouraged to: complete a REMS-compliant education program, counsel patients and/or their caregivers, with every prescription, on safe use, serious risks, storage, and disposal of these products, emphasize to patients and their caregivers the importance of reading the Medication Guide every time it is provided by their pharmacist, and consider other tools to improve patient, household, and community safety. Life-Threatening Respiratory Depression Serious, life-threatening, or fatal respiratory depression may occur with use of Tramadol Hydrochloride Extended-Release Capsules. Monitor for respiratory depression, especially during initiation of Tramadol Hydrochloride Extended-Release Capsules or following a dose increase. Instruct patients to swallow Tramadol Hydrochloride Extended-Release Capsules intact, and not to split, break, chew, crush, or dissolve the contents of the capsules to avoid exposure to a potentially fatal dose of tramadol [ see Warnings and Precautions (5.3) ]. Accidental Ingestion Accidental ingestion of/exposure to even one dose of Tramadol Hydrochloride Extended-Release Capsules especially by children, can result in a fatal overdose of tramadol [ see Warnings and Precautions (5.3) ]. Ultra-Rapid Metabolism Of Tramadol And Other Risk Factors For Life-Threatening Respiratory Depression In Children Life-threatening respiratory depression and death have occurred in children who received tramadol. Some of the reported cases occurred following tonsillectomy and/or adenoidectomy, and in at least one case, the child had evidence of being an ultra-rapid metabolizer of tramadol due to a CYP2D6 polymorphism [ see Warnings and Precautions (5.4) ]. Tramadol Hydrochloride Extended-Release Capsules are contraindicated in children younger than 12 years of age and in children younger than 18 years of age following tonsillectomy and/or adenoidectomy [ see Contraindications (4) ]. Avoid the use of Tramadol Hydrochloride Extended-Release Capsules in adolescents 12 to 18 years of age who have other risk factors that may increase their sensitivity to the respiratory depressant effects of tramadol [ see Warnings and Precautions (5.4) ]. Neonatal Opioid Withdrawal Syndrome Prolonged use of Tramadol Hydrochloride Extended-Release Capsules during pregnancy can result in neonatal opioid withdrawal syndrome, which may be life-threatening if not recognized and treated, and requires management according to protocols developed by neonatology experts. If opioid use is required for a prolonged period in a pregnant woman, advise the patient of the risk of neonatal opioid withdrawal syndrome and ensure that appropriate treatment will be available [ see Warnings and Precautions (5.5) ]. Interactions with Drugs Affecting Cytochrome P450 Isoenzymes The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with tramadol are complex. Use of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with Tramadol Hydrochloride Extended-Release Capsules requires careful consideration of the effects on the parent drug, tramadol, and the active metabolite, M1 [ see Warnings and Precautions (5.6) , Drug Interactions (7) ]. Risks From Concomitant Use With Benzodiazepines Or Other CNS Depressants Concomitant use of opioids with benzodiazepines or other central nervous system (CNS) depressants, including alcohol, may result in profound sedation, respiratory depression, coma, and death [ see Warnings and Precautions (5.7) , Drug Interactions (7) ]. Reserve concomitant prescribing of Tramadol Hydrochloride Extended-Release Capsules and benzodiazepines or other CNS depressants for use in patients for whom alternative treatment options are inadequate. Limit dosages and durations to the minimum required. Follow patients for signs and symptoms of respiratory depression and sedation.