Methylin

6 ADVERSE REACTIONS The following adverse reactions are discussed in more detail in other sections of the labeling: Abuse, misuse, and addiction [see Warnings and Precautions ( 5.1 ), Drug Abuse and Dependence ( 9.2 , 9.3 )] Known hypersensitivity to methylphenidate or other components of Methylin [see Contraindications ( 4 )] Hypertensive crisis when used concomitantly with monoamine oxidase inhibitors [see Contraindications ( 4 ), Drug Interactions ( 7 )] Risks to patients with serious cardiac disease [see Warnings and Precautions ( 5.2 )] Increased blood pressure and heart rate [see Warnings and Precautions ( 5.3 )] Psychiatric adverse reactions [see Warnings and Precautions ( 5.4 )] Priapism [see Warnings and Precautions ( 5.5 )] Peripheral vasculopathy, including Raynaud’s phenomenon [see Warnings and Precautions ( 5.6 )] Long-term suppression of growth in pediatric patients [see Warnings and Precautions ( 5.7 )] Acute angle closure glaucoma [see Warnings and Precautions ( 5.8 )] Increased intraocular pressure and glaucoma [see Warnings and Precautions ( 5.9 )] Motor and verbal tics, and worsening of Tourette’s syndrome [see Warnings and Precautions ( 5.10 )] The following adverse reactions associated with the use of methylphenidate containing products were identified in clinical studies, postmarketing reports, or literature. Because some of these reactions were 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. Infections and infestations: nasopharyngitis Blood and the lymphatic system disorders: leukopenia, thrombocytopenia, anemia, pancytopenia Immune system disorders: hypersensitivity reactions, including angioedema and anaphylaxis, auricular swelling, bullous conditions, eruptions, exanthemas Metabolism and nutrition disorders: decreased appetite, reduced weight gain and suppression of growth during prolonged use in pediatric patients Psychiatric disorders: insomnia, anxiety, restlessness, agitation, psychosis (sometimes with visual and tactile hallucinations), depressed mood, affect lability, mania, disorientation, libido changes Nervous system disorders: headache, dizziness, tremor, dyskinesia including choreoatheetoid movements, drowsiness, convulsions, cerebral arteritis and/or occlusion, serotonin syndrome in combination with serotonergic drugs, migraine, motor and verbal tics Eye disorders: blurred vision, difficulties in visual accommodation, diplopia, mydriasis, increased intraocular pressure Cardiac disorders: tachycardia, palpitations, increased blood pressure, arrhythmias, angina pectoris, sudden cardiac death, myocardial infarction, bradycardia, extrasystole Respiratory, thoracic and mediastinal disorders: cough, pharyngolaryngeal pain, dyspnea Gastrointestinal disorders: dry mouth, nausea, vomiting, abdominal pain, dyspepsia, diarrhea General disorders: fatigue, hyperpyrexia Hepatobiliary disorders: abnormal liver function, ranging from transaminase elevation to severe hepatic injury Skin and subcutaneous tissue disorders: hyperhidrosis, pruritus, urticaria, exfoliative dermatitis, scalp hair loss, erythema multiforme rash, thrombocytopenic purpura angioneurotic edema, erythema, fixed drug eruption Musculoskeletal and connective tissue disorders: arthralgia, muscle cramps, rhabdomyolysis, myalgia, muscle twitching Renal and urinary disorders: hematuria Reproductive system and breast disorders: gynecomastia Urogenital disorders: priapism Vascular disorders: peripheral coldness, Raynaud’s phenomenon Investigations: weight loss Common adverse reactions: tachycardia, palpitations, headache, insomnia, anxiety, hyperhidrosis, weight loss, decreased appetite, dry mouth, nausea, and abdominal pain. ( 6 ) To report SUSPECTED ADVERSE REACTIONS contact Shionogi Inc. at 1-800-849-9707 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

4 CONTRAINDICATIONS Methylin is contraindicated in patients: with known hypersensitivity to methylphenidate or other components of Methylin. Hypersensitivity reactions such as angioedema and anaphylactic reactions have been reported in patients treated with methylphenidate [see Adverse Reactions ( 6 )] . receiving concomitant treatment with monoamine oxidase inhibitors (MAOIs), or within 14 days following discontinuation of treatment with an MAOI, because of the risk of hypertensive crises [see Drug Interactions ( 7 )] . Known hypersensitivity to methylphenidate or other components of Methylin ( 4 ) Concurrent treatment with a monoamine oxidase inhibitor (MAOI), or use of an MAOI within the preceding 14 days ( 4)

11 DESCRIPTION Methylin contains methylphenidate hydrochloride a CNS stimulant. It is available as an oral solution in 5 mg/5 mL and 10 mg/5 mL strengths for oral administration. Chemically, methylphenidate hydrochloride is ( d,l (racemic) methyl α-phenyl-2-piperidineacetate hydrochloride and its structural formula is: Methylphenidate hydrochloride is a white, odorless, fine crystalline powder. Its solutions are acid to litmus. It is freely soluble in water and in methanol, soluble in alcohol, and slightly soluble in chloroform and in acetone. Each mL of Methylin 5 mg/5 mL contains 1 mg of methylphenidate hydrochloride USP. Each mL of Methylin 10 mg/5 mL contains 2 mg of methylphenidate hydrochloride USP. Methylin also contains the following inactive ingredients: citric acid anhydrous, glycerin, N&A grape flavor, PEG 1450, and purified water. Chemical Structure

2 DOSAGE AND ADMINISTRATION Pediatric patients 6 years and older: Starting dose is 5 mg twice daily (before breakfast and lunch); increase the dose 5 mg to 10 mg weekly; daily dosage above 60 mg is not recommended. ( 2.2 ) Adults: Administer in divided doses 2 or 3 times daily, preferably 30 to 45 minutes before meals. Average dosage is 20 to 30 mg daily. Maximum recommended daily dosage is 60 mg. ( 2 ) 2.1 Pretreatment Screening Prior to treating patients with Methylin, assess: for the presence of cardiac disease (i.e., perform a careful history, family history of sudden death or ventricular arrhythmia, and physical exam) [see Warnings and Precautions ( 5.2 )] . the family history and clinically evaluate patients for motor or verbal tics or Tourette’s syndrome [see Warnings and Precautions ( 5.10 )] . 2.2 General Dosing Information Pediatric Patients 6 years of Age and Older The recommended starting dosage is 5 mg orally twice daily before breakfast and lunch (preferably 30 to 45 minutes before meals). Increase the dosage gradually, in increments of 5 mg to 10 mg weekly. Daily dosage above 60 mg is not recommended. Adults Administer orally in divided doses 2 or 3 times daily, preferably 30 to 45 minutes before meals. The maximum recommended daily dose is 60 mg. The average dosage is 20 to 30 mg daily. For adult patients who are unable to sleep if medication is taken late in the day, administer the last dose before 6 p.m. 2.3 Dosage Reduction and Discontinuation If paradoxical aggravation of symptoms or other adverse reactions occur, reduce dosage, or, if necessary, discontinue Methylin. If improvement is not observed after appropriate dosage adjustment over a one-month period, discontinue Methylin.

1 INDICATIONS AND USAGE Methylin is indicated for the treatment of: Attention Deficit Hyperactivity Disorder (ADHD) in adults and pediatric patients 6 years of age and older Narcolepsy Methylin is a central nervous system (CNS) stimulant indicated for the treatment of: Attention Deficit Hyperactivity Disorder (ADHD) in adults and pediatric patients 6 years of age and older ( 1 ) Narcolepsy ( 1 )

9.2 Abuse Methylin has a high potential for abuse and misuse which can lead to the development of a substance use disorder, including addiction [see Warnings and Precautions (5.1)] . Methylin can be diverted for non medical use into illicit channels or distribution. Abuse is the intentional non-therapeutic use of a drug, even once, to achieve a desired psychological or physiological effect. Misuse is the intentional use, for therapeutic purposes, of a drug by an individual in a way other than prescribed by a healthcare provider or for whom it was not prescribed. Drug addiction is a cluster of behavioral, cognitive, and physiological phenomena that may include a strong desire to take the drug, difficulties in controlling drug use (e.g., continuing drug use despite harmful consequences, giving a higher priority to drug use than other activities and obligations), and possible tolerance or physical dependence. Misuse and abuse of methylphenidate may cause increased heart rate, respiratory rate, or blood pressure; sweating; dilated pupils; hyperactivity; restlessness; insomnia; decreased appetite; loss of coordination; tremors; flushed skin; vomiting; and/or abdominal pain. Anxiety, psychosis, hostility, aggression, and suicidal or homicidal ideation have also been observed with CNS stimulants abuse and/or misuse. Misuse and abuse of CNS stimulants, including Methylin, can result in overdose and death [see Overdosage ( 10 )] , and this risk is increased with higher doses and or unapproved methods of administration, such as snorting or injection

9.1 Controlled Substance Methylin contains methylphenidate hydrochloride, a Schedule II controlled substance.

9.3 Dependence Physical Dependence Methylin may produce physical dependence. Physical dependence is a state that develops as a result of physiological adaptation in response to repeated drug use, manifested by withdrawal signs and symptoms after abrupt discontinuation or a significant dose reduction of a drug. Withdrawal signs and symptoms after abrupt discontinuation or dose reduction following prolonged use of CNS stimulants including Methylin include dysphoric mood; depression; fatigue; vivid, unpleasant dreams; insomnia or hypersomnia; increased appetite; and psychomotor retardation or agitation. Tolerance Methylin may produce tolerance. Tolerance is a physiological state characterized by a reduced response to a drug after repeated administration (i.e., a higher dose of a drug is required to produce the same effect that was once obtained at a lower dose).

9 DRUG ABUSE AND DEPENDENCE 9.1 Controlled Substance Methylin contains methylphenidate hydrochloride, a Schedule II controlled substance. 9.2 Abuse Methylin has a high potential for abuse and misuse which can lead to the development of a substance use disorder, including addiction [see Warnings and Precautions (5.1)] . Methylin can be diverted for non medical use into illicit channels or distribution. Abuse is the intentional non-therapeutic use of a drug, even once, to achieve a desired psychological or physiological effect. Misuse is the intentional use, for therapeutic purposes, of a drug by an individual in a way other than prescribed by a healthcare provider or for whom it was not prescribed. Drug addiction is a cluster of behavioral, cognitive, and physiological phenomena that may include a strong desire to take the drug, difficulties in controlling drug use (e.g., continuing drug use despite harmful consequences, giving a higher priority to drug use than other activities and obligations), and possible tolerance or physical dependence. Misuse and abuse of methylphenidate may cause increased heart rate, respiratory rate, or blood pressure; sweating; dilated pupils; hyperactivity; restlessness; insomnia; decreased appetite; loss of coordination; tremors; flushed skin; vomiting; and/or abdominal pain. Anxiety, psychosis, hostility, aggression, and suicidal or homicidal ideation have also been observed with CNS stimulants abuse and/or misuse. Misuse and abuse of CNS stimulants, including Methylin, can result in overdose and death [see Overdosage ( 10 )] , and this risk is increased with higher doses and or unapproved methods of administration, such as snorting or injection 9.3 Dependence Physical Dependence Methylin may produce physical dependence. Physical dependence is a state that develops as a result of physiological adaptation in response to repeated drug use, manifested by withdrawal signs and symptoms after abrupt discontinuation or a significant dose reduction of a drug. Withdrawal signs and symptoms after abrupt discontinuation or dose reduction following prolonged use of CNS stimulants including Methylin include dysphoric mood; depression; fatigue; vivid, unpleasant dreams; insomnia or hypersomnia; increased appetite; and psychomotor retardation or agitation. Tolerance Methylin may produce tolerance. Tolerance is a physiological state characterized by a reduced response to a drug after repeated administration (i.e., a higher dose of a drug is required to produce the same effect that was once obtained at a lower dose).

10 OVERDOSAGE Clinical Effects of Overdose Overdose of CNS stimulants is characterized by the following sympathomimetic effects: Cardiovascular effects including tachyarrhythmias, and hypertension or hypotension. Vasospasm, myocardial infarction, or aortic dissection may precipitate sudden cardiac death. Takotsubo cardiomyopathy may develop. CNS effects including psychomotor agitation, confusion, and hallucinations. Serotonin syndrome, seizures, cerebral vascular accidents, and coma may occur. Life-threatening hyperthermia (temperatures greater than 104°F) and rhabdomyolysis may develop. Overdose Management Consider the possibility of multiple drug ingestion. Because methylphenidate has a large volume of distribution and is rapidly metabolized, dialysis is not useful. Consider contacting the Poison Help line (1-800-222-1222) or a medical toxicologist for additional overdose management recommendations.

7 DRUG INTERACTIONS Antihypertensive Drugs: Monitor blood pressure. Adjust dosage of antihypertensive drug as needed. ( 7.1 ) 7.1 Clinically Important Drug Interactions with Methylin Table 1 presents clinically important drug interactions with Methylin. Table 1: Clinically Important Drug Interactions with Methylin Monoamine Oxidase Inhibitors (MAOI) Clinical Impact: Concomitant use of MAOIs and CNS stimulants, including Methylin, can cause hypertensive crisis. Potential outcomes include death, stroke, myocardial infarction, aortic dissection, ophthalmological complications, eclampsia, pulmonary edema, and renal failure [see Contraindications ( 4 )] . Intervention: Concomitant use of Methylin with monoamine oxidase inhibitors (MAOIs) or within 14 days after discontinuing MAOI treatment is contraindicated. Antihypertensive Drugs Clinical Impact: Methylin may decrease the effectiveness of drugs used to treat hypertension [see Warnings and Precautions ( 5.3 )] . Intervention: Monitor blood pressure and adjust the dosage of the antihypertensive drug as needed. Halogenated Anesthetics Clinical Impact: Concomitant use of halogenated anesthetics and Methylin may increase the risk of sudden blood pressure and heart rate increase during surgery. Intervention: Avoid use of Methylin in patients being treated with anesthetics on the day of surgery. Risperidone Clinical Impact: Combined use of methylphenidate with risperidone when there is a change, whether an increase or decrease, in dosage of either or both medications, may increase the risk of extrapyramidal symptoms (EPS). Intervention: Monitor for signs of EPS.

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Methylphenidate hydrochloride is a central nervous system (CNS) stimulant. The mode of therapeutic action in ADHD is not known. 12.2 Pharmacodynamics Methylphenidate is a racemic mixture comprised of the d- and l-threo enantiomers. The d-threo enantiomer is more pharmacologically active than the l-threo enantiomer. Methylphenidate blocks the reuptake of norepinephrine and dopamine into the presynaptic neuron and increases the release of these monoamines into the extraneuronal space. Cardiac Electrophysiology A formal QT study has not been conducted in subjects taking Methylin. The effect of dexmethylphenidate, the pharmacologically active d-enantiomer of Methylin, on the QT interval was evaluated in a double-blind, placebo- and open-label active (moxifloxacin)-controlled study following single doses of 40 mg dexmethylphenidate hydrochloride extended-release capsule in 75 healthy volunteers. Electrocardiograms were collected up to 12 hours postdose. Frederica’s method for heart rate correction was employed to derive the corrected QT interval (QTcF). The maximum mean prolongation of QTcF intervals was less than 5 ms, and the upper limit of the 90% confidence interval was below 10 ms for all time-matched comparisons versus placebo. This was below the threshold of clinical concern and there was no evident exposure response relationship. 12.3 Pharmacokinetics Absorption Following a single dose administration of 20 mg Methylin and 20 mg tablet of methylphenidate hydrochloride in healthy volunteers under fasted conditions, time to peak plasma concentration (T max ) of methylphenidate was at 1 to 2 hours after dosing, and: The mean peak plasma concentration (C max ) of methylphenidate was 9.1 ng/mL and 9.8 ng/mL, respectively. The mean area under concentration curve (AUC) of methylphenidate was 46.7 hour*ng/mL and 50.0 hour*ng/mL, respectively. Effect of Food Ingestion of a high-fat meal with Methylin increased methylphenidate mean C max and AUC by about 13% and 25%, respectively. Time to C max (T max ) was delayed by approximately 1 hour. Distribution Plasma protein binding is 10% to 33%. The volume of distribution was 2.65 ± 1.11 L/kg for d-methylphenidate and 1.80 ± 0.91 L/kg for l-methylphenidate. Elimination The mean terminal half-life (t ½ ) of methylphenidate was 2.7 hours following administration of 20 mg Methylin Oral Solution. The systemic clearance is 0.40 ± 0.12 L/h/kg for d-methylphenidate and 0.73 ± 0.28 L/h/kg for l-methylphenidate. Metabolism Methylphenidate is metabolized primarily by deesterification to alpha-phenyl-piperidine acetic acid (ritalinic acid), which has little or no pharmacologic activity. Excretion After oral dosing of radiolabeled methylphenidate in humans, about 90% of the radioactivity was recovered in urine. The main urinary metabolite was ritalinic acid, accounting for approximately 80% of the dose. Specific Populations Male and Female Patients, Racial Groups, and Age The effect of gender, race, and age on the pharmacokinetics of methylphenidate after Methylin administration have not been studied. Patients with Renal Impairment Methylin has not been studied in in patients with renal impairment. Since renal clearance is not an important route of methylphenidate clearance, renal impairment is expected to have little effect on the pharmacokinetics of Methylin. Patients with Hepatic Impairment Methylin has not been studied in patients with hepatic impairment. Since methylphenidate is metabolized primarily to ritalinic acid by nonmicrosomal hydrolytic esterases that are widely distributed throughout the body, hepatic impairment is expected to have minimal effect on the pharmacokinetics of Methylin.

12.1 Mechanism of Action Methylphenidate hydrochloride is a central nervous system (CNS) stimulant. The mode of therapeutic action in ADHD is not known.

12.2 Pharmacodynamics Methylphenidate is a racemic mixture comprised of the d- and l-threo enantiomers. The d-threo enantiomer is more pharmacologically active than the l-threo enantiomer. Methylphenidate blocks the reuptake of norepinephrine and dopamine into the presynaptic neuron and increases the release of these monoamines into the extraneuronal space. Cardiac Electrophysiology A formal QT study has not been conducted in subjects taking Methylin. The effect of dexmethylphenidate, the pharmacologically active d-enantiomer of Methylin, on the QT interval was evaluated in a double-blind, placebo- and open-label active (moxifloxacin)-controlled study following single doses of 40 mg dexmethylphenidate hydrochloride extended-release capsule in 75 healthy volunteers. Electrocardiograms were collected up to 12 hours postdose. Frederica’s method for heart rate correction was employed to derive the corrected QT interval (QTcF). The maximum mean prolongation of QTcF intervals was less than 5 ms, and the upper limit of the 90% confidence interval was below 10 ms for all time-matched comparisons versus placebo. This was below the threshold of clinical concern and there was no evident exposure response relationship.

12.3 Pharmacokinetics Absorption Following a single dose administration of 20 mg Methylin and 20 mg tablet of methylphenidate hydrochloride in healthy volunteers under fasted conditions, time to peak plasma concentration (T max ) of methylphenidate was at 1 to 2 hours after dosing, and: The mean peak plasma concentration (C max ) of methylphenidate was 9.1 ng/mL and 9.8 ng/mL, respectively. The mean area under concentration curve (AUC) of methylphenidate was 46.7 hour*ng/mL and 50.0 hour*ng/mL, respectively. Effect of Food Ingestion of a high-fat meal with Methylin increased methylphenidate mean C max and AUC by about 13% and 25%, respectively. Time to C max (T max ) was delayed by approximately 1 hour. Distribution Plasma protein binding is 10% to 33%. The volume of distribution was 2.65 ± 1.11 L/kg for d-methylphenidate and 1.80 ± 0.91 L/kg for l-methylphenidate. Elimination The mean terminal half-life (t ½ ) of methylphenidate was 2.7 hours following administration of 20 mg Methylin Oral Solution. The systemic clearance is 0.40 ± 0.12 L/h/kg for d-methylphenidate and 0.73 ± 0.28 L/h/kg for l-methylphenidate. Metabolism Methylphenidate is metabolized primarily by deesterification to alpha-phenyl-piperidine acetic acid (ritalinic acid), which has little or no pharmacologic activity. Excretion After oral dosing of radiolabeled methylphenidate in humans, about 90% of the radioactivity was recovered in urine. The main urinary metabolite was ritalinic acid, accounting for approximately 80% of the dose. Specific Populations Male and Female Patients, Racial Groups, and Age The effect of gender, race, and age on the pharmacokinetics of methylphenidate after Methylin administration have not been studied. Patients with Renal Impairment Methylin has not been studied in in patients with renal impairment. Since renal clearance is not an important route of methylphenidate clearance, renal impairment is expected to have little effect on the pharmacokinetics of Methylin. Patients with Hepatic Impairment Methylin has not been studied in patients with hepatic impairment. Since methylphenidate is metabolized primarily to ritalinic acid by nonmicrosomal hydrolytic esterases that are widely distributed throughout the body, hepatic impairment is expected to have minimal effect on the pharmacokinetics of Methylin.

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30

3 DOSAGE FORMS AND STRENGTHS Methylin oral solution is a colorless, grape flavored liquid available in a 500 mL bottle in the following strengths: 5 mg per 5 mL 10 mg per 5 mL Oral solution: 5 mg per 5 mL and 10 mg per 5 mL. ( 3 )

Methylin Methylphenidate Hydrochloride METHYLPHENIDATE HYDROCHLORIDE METHYLPHENIDATE ANHYDROUS CITRIC ACID GLYCERIN POLYETHYLENE GLYCOL 1450 WATER Methylin Methylphenidate Hydrochloride METHYLPHENIDATE HYDROCHLORIDE METHYLPHENIDATE ANHYDROUS CITRIC ACID GLYCERIN POLYETHYLENE GLYCOL 1450 WATER

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis In a lifetime carcinogenicity study carried out in B6C3F1 mice, methylphenidate caused an increase in hepatocellular adenomas and, in males only, an increase in hepatoblastomas, at a daily dose of approximately 60 mg/kg/day. This dose is approximately 5 times the maximum recommended human dose (MRHD) of 60 mg/kg given to adults on a mg/m 2 basis. Hepatoblastoma is a relatively rare rodent malignant tumor type. There was no increase in total malignant hepatic tumors. The mouse strain used is sensitive to the development of hepatic tumors, and the significance of these results to humans is unknown. Methylphenidate did not cause any increase in tumors in a lifetime carcinogenicity study carried out in F344 rats; the highest dose used was approximately 45 mg/kg/day, which is approximately 7 times the MRHD (adults) on a mg/m 2 basis. In a 24-week carcinogenicity study in the transgenic mouse strain p53+/-, which is sensitive to genotoxic carcinogens, there was no evidence of carcinogenicity. Male and female mice were fed diets containing the same concentration of methylphenidate as in the lifetime carcinogenicity study; the high-dose groups were exposed to 60 to 74 mg/kg/day of methylphenidate. Mutagenesis Methylphenidate was not mutagenic in the in vitro Ames reverse mutation assay, in the in vitro mouse lymphoma cell forward mutation assay, or in the in vitro chromosomal aberration assay using human lymphocytes. Sister chromatid exchanges and chromosome aberrations were increased, indicative of a weak clastogenic response, in an in vitro assay in cultured Chinese Hamster Ovary (CHO) cells. Methylphenidate was negative in vivo in males and females in the mouse bone marrow micronucleus assay. Impairment of Fertility No human data on the effect of methylphenidate on fertility are available. Methylphenidate did not impair fertility in male or female mice that were fed diets containing the drug in an 18-week continuous breeding study. The study was conducted at doses up to 160 mg/kg/day, approximately 13 times the maximum recommended human dose of 60 mg/day given to adults on a mg/m 2 basis.

13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis In a lifetime carcinogenicity study carried out in B6C3F1 mice, methylphenidate caused an increase in hepatocellular adenomas and, in males only, an increase in hepatoblastomas, at a daily dose of approximately 60 mg/kg/day. This dose is approximately 5 times the maximum recommended human dose (MRHD) of 60 mg/kg given to adults on a mg/m 2 basis. Hepatoblastoma is a relatively rare rodent malignant tumor type. There was no increase in total malignant hepatic tumors. The mouse strain used is sensitive to the development of hepatic tumors, and the significance of these results to humans is unknown. Methylphenidate did not cause any increase in tumors in a lifetime carcinogenicity study carried out in F344 rats; the highest dose used was approximately 45 mg/kg/day, which is approximately 7 times the MRHD (adults) on a mg/m 2 basis. In a 24-week carcinogenicity study in the transgenic mouse strain p53+/-, which is sensitive to genotoxic carcinogens, there was no evidence of carcinogenicity. Male and female mice were fed diets containing the same concentration of methylphenidate as in the lifetime carcinogenicity study; the high-dose groups were exposed to 60 to 74 mg/kg/day of methylphenidate. Mutagenesis Methylphenidate was not mutagenic in the in vitro Ames reverse mutation assay, in the in vitro mouse lymphoma cell forward mutation assay, or in the in vitro chromosomal aberration assay using human lymphocytes. Sister chromatid exchanges and chromosome aberrations were increased, indicative of a weak clastogenic response, in an in vitro assay in cultured Chinese Hamster Ovary (CHO) cells. Methylphenidate was negative in vivo in males and females in the mouse bone marrow micronucleus assay. Impairment of Fertility No human data on the effect of methylphenidate on fertility are available. Methylphenidate did not impair fertility in male or female mice that were fed diets containing the drug in an 18-week continuous breeding study. The study was conducted at doses up to 160 mg/kg/day, approximately 13 times the maximum recommended human dose of 60 mg/day given to adults on a mg/m 2 basis.

NDA021419

Methylin

Methylphenidate Hydrochloride

59630-750

HUMAN PRESCRIPTION DRUG

ORAL

PRINCIPAL DISPLAY PANEL - 5 mg per 5 mL NDC 59630-750-50 500 mL CII Methylin ® Oral Solution methylphenidate HCl oral solution 5 mg per 5 mL Rx only PHARMACIST: Dispense the Medication Guide provided separately to each patient. SHIONOGI INC. L00M63 Rev 10/2018 PRINCIPAL DISPLAY PANEL - 5 mg per 5 mL

Boxed Warning 05/2023 Dosage and Administration (2.1, 2.2, 2.3) 05/2023 Warnings and Precautions (5.1, 5.2, 5.8, 5.9, 5.10) 05/2023 Boxed Warning 10/2023 Dosage and Administration ( 2.1 , 2.2 , 2.3 ) 10/2023 Warnings and Precautions ( 5.1 , 5.2 , 5.8 , 5.9 , 5.10 ) 10/2023

17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling ( Medication Guide ). Abuse, Misuse, and Addiction Educate patients and their families about the risks of abuse, misuse, and addiction of Methylin, which can lead to overdose and death, and proper disposal of any unused drug [see Warnings and Precautions ( 5.1 ), Drug Abuse and Dependence ( 9.2 ), Overdosage ( 10 )] . Advise patients to store Methylin in a safe place, preferably locked, and instruct patients to not give Methylin to anyone else. Risks to Patients with Serious Cardiac Disease Advise patients that there are potential risks to patients with serious cardiac disease, including sudden death, with Methylin use. Instruct patients to contact a healthcare provider immediately if they develop symptoms such as exertional chest pain, unexplained syncope, or other symptoms suggestive of cardiac disease [see Warnings and Precautions ( 5.2 )] . Increased Blood Pressure and Heart Rate Instruct patients that Methylin can elevate blood pressure and heart rate [see Warnings and Precautions ( 5.3 )] . Psychiatric Adverse Reactions Advise patients that Methylin, at recommended doses, can cause psychotic or manic symptoms, even in patients without prior history of psychotic symptoms or mania [see Warnings and Precautions ( 5.4 )] . Priapism Advise patients of the possibility of painful or prolonged penile erections (priapism). Instruct the patient to seek immediate medical attention in the event of priapism [see Warnings and Precautions ( 5.5 )] . Circulation Problems in Fingers and Toes (Peripheral Vasculopathy, Including Raynaud’s Phenomenon) Instruct patients about the risk of peripheral vasculopathy, including Raynaud’s phenomenon, and associated signs and symptoms: fingers or toes may feel numb, cool, painful, and/or may change color from pale, to blue, to red. Instruct patients to report to their physician any new numbness, pain, skin color change, or sensitivity to temperature in fingers or toes. Instruct patients to call their physician immediately with any signs of unexplained wounds appearing on fingers or toes while taking Methylin. Further clinical evaluation (e.g., rheumatology referral) may be appropriate for certain patients [see Warnings and Precautions ( 5.6 )] . Long-Term Suppression of Growth in Pediatric Patients Advise patients that Methylin may cause slowing of growth and weight loss in pediatric patients [see Warnings and Precautions ( 5.7 )] . Increased Intraocular Pressure (IOP) and Glaucoma Advise patients that IOP and glaucoma may occur during treatment with Methylin [see Warnings and Precautions ( 5.9 )] . Motor and Verbal Tics, and Worsening of Tourette’s Syndrome Advise patients that motor and verbal tics and worsening of Tourette’s syndrome may occur during treatment with Methylin. Instruct patients to notify their healthcare provider if emergence of new tics or worsening of tics or Tourette’s syndrome occurs [see Warnings and Precautions ( 5.10 )] . Pregnancy Exposure Registry Inform patients that there is a pregnancy exposure registry that monitors pregnancy outcomes in patients exposed to Methylin during pregnancy [see Use in Specific Populations ( 8.1 )] . Distributed by: Shionogi Inc. Florham Park, NJ 07932 Manufactured by: SpecGx LLC Webster Groves, MO 63119 USA Methylin is a trademark of Mallinckrodt LLC. MOS-PI-08 L20M21 An electronic copy of this medication guide can be obtained from www.mallinckrodt.com/Medguide/L20M31.pdf or by calling 1-800-778-7898 for alternate delivery options.

MEDICATION GUIDE MEDICATION GUIDE METHYLIN ® (METH il in) (methylphenidate hydrochloride) oral solution, CII What is the most important information I should know about METHYLIN? METHYLIN may cause serious side effects, including: Abuse, misuse, and addiction. METHYLIN has a high chance for abuse and misuse and may lead to substance use problems, including addiction. Misuse and abuse of METHYLIN, other methylphenidate containing medicines, and amphetamine containing medicines, can lead to overdose and death. The risk of overdose and death is increased with higher doses of METHYLIN or when it is used in ways that are not approved, such as snorting or injection. Your healthcare provider should check you or your child’s risk for abuse, misuse, and addiction before starting treatment with METHYLIN and will monitor you or your child during treatment. METHYLIN may lead to physical dependence after prolonged use, even if taken as directed by your healthcare provider. Do not give METHYLIN to anyone else. See “What is METHYLIN?” for more information. Keep METHYLIN in a safe place and properly dispose of any unused medicine. See “How should I store METHYLIN?” for more information. Tell your healthcare provider if you or your child have ever abused or been dependent on alcohol, prescription medicines, or street drugs. Risks for people with serious heart disease. Sudden death has happened in people who have heart defects or other serious heart disease. Your healthcare provider should check you or your child carefully for heart problems before starting treatment with METHYLIN. Tell your healthcare provider if you or your child have any heart problems, heart disease, or heart defects. Call your healthcare provider or go to the nearest hospital emergency room right away if you or your child have any signs of heart problems such as chest pain, shortness of breath, or fainting during treatment with METHYLIN. Your healthcare provider should check you or your child carefully for heart problems before starting treatment with METHYLIN. Tell your healthcare provider if you or your child have any heart problems, heart defects, high blood pressure, or have a family history of these problems. Your healthcare provider should check your or your child’s blood pressure and heart rate regularly during treatment with METHYLIN. Call your healthcare provider or go to the nearest hospital emergency room right away if you or your child have any signs of heart problems such as chest pain, shortness of breath, or fainting during treatment with METHYLIN. Mental (psychiatric) problems, including: new or worse behavior and thought problems new or worse bipolar illness new psychotic symptoms (such as hearing voices, or seeing or believing things that are not real) or new manic symptoms Tell your healthcare provider about any mental problems you or your child have, or about a family history of suicide, bipolar illness, or depression. Call your healthcare provider right away if you or your child have any new or worsening mental symptoms or problems during treatment with METHYLIN, especially hearing voices, seeing or believing things that are not real, or new manic symptoms. What is METHYLIN? METHYLIN is a prescription medicine used for the treatment of Attention Deficit Hyperactivity Disorder (ADHD) in people 6 years of age and older. METHYLIN may help increase attention and decrease impulsiveness and hyperactivity in people with ADHD. It is not known if METHYLIN is safe and effective for use in children under 6 years of age. METHYLIN is a federally controlled substance (CII) because it contains methylphenidate that can be a target for people who abuse prescription medicines or street drugs. Keep METHYLIN in a safe place to protect it from theft. Never give your METHYLIN to anyone else, because it may cause death or harm them. Selling or giving away METHYLIN may harm others and is against the law. Do not take METHYLIN if you or your child are: allergic to methylphenidate hydrochloride or any of the ingredients in METHYLIN. See the end of this Medication Guide for a complete list of ingredients in METHYLIN. taking, or have stopped taking within the past 14 days, a medicine called a monoamine oxidase inhibitor (MAOI). Before taking METHYLIN tell your healthcare provider about all your medical conditions, including if you or your child: have heart problems, heart disease, heart defects, or high blood pressure have mental problems including psychosis, mania, bipolar illness, or depression, or have a family history of suicide, bipolar illness, or depression have circulation problems in fingers and toes have eye problems, including increased pressure in your eye, glaucoma, or problems with your close-up vision (farsightedness) have or had repeated movements or sounds (tics) or Tourette’s syndrome, or have a family history of tics or Tourette’s syndrome are pregnant or plan to become pregnant. It is not known if METHYLIN will harm the unborn baby. There is a pregnancy registry for females who are exposed to METHYLIN during pregnancy. The purpose of the registry is to collect information about the health of females exposed to METHYLIN and their baby. If you or your child becomes pregnant during treatment with METHYLIN, talk to your healthcare provider about registering with the National Pregnancy Registry for Psychostimulants at 1-866-961-2388. are breastfeeding or plan to breastfeed. METHYLIN passes into breast milk. Talk to your healthcare provider about the best way to feed the baby during treatment with METHYLIN. Tell your healthcare provider about all the medicines that you take or your child take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. METHYLIN and some medicines may interact with each other and cause serious side effects. Sometimes the doses of other medicines will need to be changed during treatment with METHYLIN. Your healthcare provider will decide whether METHYLIN can be taken with other medicines. Especially tell your healthcare provider if you or your child take a medicine used to treat depression called a monoamine oxidase inhibitor (MAOI). Know the medicines that you take or your child take. Keep a list of your medicines with you to show your healthcare provider and pharmacist. Do not start any new medicine during treatment with METHYLIN without talking to your healthcare provider first. How should METHYLIN be taken? Take METHYLIN exactly as prescribed by your healthcare provider. Your healthcare provider may change the dose if needed. Children 6 years of age and older: Take METHYLIN by mouth 2 times a day before breakfast and lunch, 30 to 45 minutes before a meal, as prescribed by your healthcare provider. Adults: Take METHYLIN by mouth 2 or 3 times a day, 30 to 45 minutes before a meal, as prescribed by your healthcare provider. For adults who have sleep problems when METHYLIN is taken late in the day, take your last dose of METHYLIN before 6 p.m. If you or your child take too much METHYLIN, call your healthcare provider or Poison Help Line at 1-800-222-1222 or go to the nearest hospital emergency room right away. What are the possible side effects of METHYLIN? METHYLIN may cause serious side effects, including: See “What is the most important information I should know about METHYLIN?” Painful and prolonged erections (priapism). Priapism has happened in males who take products that contain methylphenidate. If you or your child develop priapism, get medical help right away. Circulation problems in fingers and toes (peripheral vasculopathy, including Raynaud’s phenomenon). Signs and symptoms may include: fingers or toes may feel numb, cool, painful fingers or toes may change color from pale, to blue, to red Tell your healthcare provider if you or your child have numbness, pain, skin color change, or sensitivity to temperature in the fingers or toes, or if you or your child have any signs of unexplained wounds appearing on fingers or toes during treatment with METHYLIN. Slowing of growth (height and weight) in children. Children should have their height and weight checked often during treatment with METHYLIN. METHYLIN treatment may be stopped if your child is not growing or gaining weight. Eye problems (increased pressure in the eye and glaucoma). Call your healthcare provider right away if you or your child develop changes in your vision or eye pain, swelling, or redness. New or worsening tics or worsening Tourette’s syndrome. Tell your healthcare provider if you or your child get any new or worsening tics or worsening Tourette’s syndrome during treatment with METHYLIN. The most common side effects of METHYLIN include: increased heart rate headache anxiety weight loss dry mouth stomach pain irregular heart beat (palpitations) trouble sleeping sweating decreased appetite nausea These are not all the possible side effects of METHYLIN. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. How should I store METHYLIN? Store METHYLIN at room temperature between 68°F to 77°F (20°C to 25°C). Store METHYLIN in a safe place, like a locked cabinet. Protect from light and moisture. Dispose of remaining, unused, or expired METHYLIN by a medicine take-back program at a U.S. Drug Enforcement Administration (DEA) authorized collection site. If no take-back program or DEA authorized collector is available, mix METHYLIN with an undesirable, nontoxic substance such as dirt, cat litter, or used coffee grounds to make it less appealing to children and pets. Place the mixture in a container such as a sealed plastic bag and throw away METHYLIN in the household trash. Visit www.fda.gov/drugdisposal for additional information on disposal of unused medicines. Keep METHYLIN and all medicines out of the reach of children. General information about the safe and effective use of METHYLIN. Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use METHYLIN for a condition for which it was not prescribed. Do not give METHYLIN to other people, even if they have the same symptoms. It may harm them and it is against the law. You can ask your healthcare provider or pharmacist for information about METHYLIN that is written for healthcare professionals. What are the ingredients in METHYLIN? Active Ingredient: methylphenidate hydrochloride USP Inactive Ingredients: citric acid anhydrous, glycerin, N&A grape flavor, PEG 1450, and purified water Distributed by : Shionogi Inc., Florham Park, NJ 07932 Manufactured by: SpecGx LLC, Webster Groves, MO 63119 USA For more information go to www.methylinrx.com or call 1-800-849-9707. This Medication Guide has been approved by the U.S. Food and Drug Administration. Revised: 10/2023 MOS-MG-06 L20M31

8.5 Geriatric Use Methylin has not been studied in the geriatric population.

8.4 Pediatric Use The safety and effectiveness of Methylin for the treatment of ADHD have been established in pediatric patients six years of age and older. The safety and effectiveness of Methylin in pediatric patients under six years of age have not been established. The long-term efficacy of methylphenidate in pediatric patients has not been established. Long-Term Suppression of Growth Growth should be monitored during treatment with stimulants, including Methylin. Pediatric patients who are not growing or gaining weight as expected may need to have their treatment interrupted [see Warnings and Precautions (5.6)] . Juvenile Animal Toxicity Data In a study conducted in young rats, methylphenidate was administered orally at doses of up to 100 mg/kg/day for 9 weeks, starting early in the postnatal period (postnatal Day 7) and continuing through sexual maturity (postnatal Week 10). When these animals were tested as adults (postnatal Weeks 13 -14), decreased spontaneous locomotor activity was observed in males and females previously treated with 50 mg/kg/day (approximately 4 times the MRHD of 60 mg/day given to children on a mg/m 2 basis) or greater, and a deficit in the acquisition of a specific learning task was seen in females exposed to the highest dose (8 times the MRHD given to children on a mg/m 2 basis). The no effect level for juvenile neurobehavioral development in rats (5 mg/kg/day) is less than the MRHD given to children on a mg/m 2 basis. The clinical significance of the long-term behavioral effects observed in rats is unknown.

8.1 Pregnancy Pregnancy Exposure Registry There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to ADHD medications, including Methylin, during pregnancy. Healthcare providers are encouraged to register patients by calling the National Pregnancy Registry for Psychostimulants at 1-866-961-2388. Risk Summary Published studies and postmarketing reports on methylphenidate use during pregnancy have not identified a drug-associated risk of major birth defects, miscarriage or adverse maternal or fetal outcomes. There may be risks to the fetus associated with the use of CNS stimulants use during pregnancy (see Clinical Considerations) . No effects on morphological development were observed in embryo-fetal development studies with oral administration of methylphenidate to pregnant rats and rabbits during organogenesis at doses up to 12 and 19 times, respectively, the maximum recommended human dose (MRHD) of 60 mg/day given to adults on a mg/m 2 basis. However, spina bifida was observed in rabbits at a dose 65 times the MRHD given to adults. A decrease in pup body weight was observed in a pre- and post-natal development study with oral administration of methylphenidate to rats throughout pregnancy and lactation at doses 7 times the MRHD given to adults (see Data) . 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% to 4% and 15% to 20%, respectively. Clinical Considerations Fetal/Neonatal Adverse Reactions CNS stimulants, such as Methylin, can cause vasoconstriction and thereby decrease placental perfusion. No fetal and/or neonatal adverse reactions have been reported with the use of therapeutic doses of methylphenidate during pregnancy; however, premature delivery and low birth weight infants have been reported in amphetamine-dependent mothers. Data Animal Data In embryo-fetal development studies conducted in rats and rabbits, methylphenidate was administered orally at doses of up to 75 and 200 mg/kg/day, respectively, during the period of organogenesis. Malformations (increased incidence of fetal spina bifida) were observed in rabbits at the highest dose, which is approximately 65 times the MRHD of 60 mg/day given to adults on a mg/m 2 basis. The no effect level for embryo-fetal development in rabbits was 60 mg/kg/day (19 times the MRHD given to adults on a mg/m 2 basis). There was no evidence of morphological development effects in rats, although increased incidences of fetal skeletal variations were seen at the highest dose level (12 times the MRHD of 60 mg/day given to adults on a mg/m 2 basis), which was also maternally toxic. The no effect level for embryo-fetal development in rats was 25 mg/kg/day (4 times the MRHD on a mg/m 2 basis). When methylphenidate was administered to rats throughout pregnancy and lactation at doses of up to 45 mg/kg/day, offspring body weight gain was decreased at the highest dose (7 times the MRHD of 60 mg/day given to adults on a mg/m 2 basis), but no other effects on postnatal development were observed. The no effect level for pre- and postnatal development in rats was 15 mg/kg/day (~2 times the MRHD given to adults on a mg/m 2 basis).

8 USE IN SPECIFIC POPULATIONS 8.1 Pregnancy Pregnancy Exposure Registry There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to ADHD medications, including Methylin, during pregnancy. Healthcare providers are encouraged to register patients by calling the National Pregnancy Registry for Psychostimulants at 1-866-961-2388. Risk Summary Published studies and postmarketing reports on methylphenidate use during pregnancy have not identified a drug-associated risk of major birth defects, miscarriage or adverse maternal or fetal outcomes. There may be risks to the fetus associated with the use of CNS stimulants use during pregnancy (see Clinical Considerations) . No effects on morphological development were observed in embryo-fetal development studies with oral administration of methylphenidate to pregnant rats and rabbits during organogenesis at doses up to 12 and 19 times, respectively, the maximum recommended human dose (MRHD) of 60 mg/day given to adults on a mg/m 2 basis. However, spina bifida was observed in rabbits at a dose 65 times the MRHD given to adults. A decrease in pup body weight was observed in a pre- and post-natal development study with oral administration of methylphenidate to rats throughout pregnancy and lactation at doses 7 times the MRHD given to adults (see Data) . 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% to 4% and 15% to 20%, respectively. Clinical Considerations Fetal/Neonatal Adverse Reactions CNS stimulants, such as Methylin, can cause vasoconstriction and thereby decrease placental perfusion. No fetal and/or neonatal adverse reactions have been reported with the use of therapeutic doses of methylphenidate during pregnancy; however, premature delivery and low birth weight infants have been reported in amphetamine-dependent mothers. Data Animal Data In embryo-fetal development studies conducted in rats and rabbits, methylphenidate was administered orally at doses of up to 75 and 200 mg/kg/day, respectively, during the period of organogenesis. Malformations (increased incidence of fetal spina bifida) were observed in rabbits at the highest dose, which is approximately 65 times the MRHD of 60 mg/day given to adults on a mg/m 2 basis. The no effect level for embryo-fetal development in rabbits was 60 mg/kg/day (19 times the MRHD given to adults on a mg/m 2 basis). There was no evidence of morphological development effects in rats, although increased incidences of fetal skeletal variations were seen at the highest dose level (12 times the MRHD of 60 mg/day given to adults on a mg/m 2 basis), which was also maternally toxic. The no effect level for embryo-fetal development in rats was 25 mg/kg/day (4 times the MRHD on a mg/m 2 basis). When methylphenidate was administered to rats throughout pregnancy and lactation at doses of up to 45 mg/kg/day, offspring body weight gain was decreased at the highest dose (7 times the MRHD of 60 mg/day given to adults on a mg/m 2 basis), but no other effects on postnatal development were observed. The no effect level for pre- and postnatal development in rats was 15 mg/kg/day (~2 times the MRHD given to adults on a mg/m 2 basis). 8.2 Lactation Risk Summary Limited published literature, based on milk sampling from seven mothers reports that methylphenidate is present in human milk, which resulted in infant doses of 0.16% to 0.7% of the maternal weight-adjusted dosage and a milk/plasma ratio ranging between 1.1 and 2.7. There are no reports of adverse effects on the breastfed infant and no effects on milk production. Long-term neurodevelopmental effects on infants from stimulant exposure are unknown. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for Methylin and any potential adverse effects on the breastfed infant from Methylin or from the underlying maternal condition. Clinical Considerations Monitor breastfeeding infants for adverse reactions, such as agitation, insomnia, anorexia, and reduced weight gain. 8.4 Pediatric Use The safety and effectiveness of Methylin for the treatment of ADHD have been established in pediatric patients six years of age and older. The safety and effectiveness of Methylin in pediatric patients under six years of age have not been established. The long-term efficacy of methylphenidate in pediatric patients has not been established. Long-Term Suppression of Growth Growth should be monitored during treatment with stimulants, including Methylin. Pediatric patients who are not growing or gaining weight as expected may need to have their treatment interrupted [see Warnings and Precautions (5.6)] . Juvenile Animal Toxicity Data In a study conducted in young rats, methylphenidate was administered orally at doses of up to 100 mg/kg/day for 9 weeks, starting early in the postnatal period (postnatal Day 7) and continuing through sexual maturity (postnatal Week 10). When these animals were tested as adults (postnatal Weeks 13 -14), decreased spontaneous locomotor activity was observed in males and females previously treated with 50 mg/kg/day (approximately 4 times the MRHD of 60 mg/day given to children on a mg/m 2 basis) or greater, and a deficit in the acquisition of a specific learning task was seen in females exposed to the highest dose (8 times the MRHD given to children on a mg/m 2 basis). The no effect level for juvenile neurobehavioral development in rats (5 mg/kg/day) is less than the MRHD given to children on a mg/m 2 basis. The clinical significance of the long-term behavioral effects observed in rats is unknown. 8.5 Geriatric Use Methylin has not been studied in the geriatric population.

16 HOW SUPPLIED/STORAGE AND HANDLING How Supplied Methylin oral solution is a colorless, grape flavored liquid available in the following strengths: 5 mg per 5 mL Bottles of 500 mL.................NDC 59630-750-50 10 mg per 5 mL Bottles of 500 mL.................NDC 59630-755-50 Storage and Handling Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature]. Dispense in tight container with child-resistant closure.

WARNING: ABUSE, MISUSE, AND ADDICTION Methylin has a high potential for abuse and misuse, which can lead to the development of a substance use disorder, including addiction. Misuse and abuse of CNS stimulants, including Methylin, can result in overdose and death [see Overdosage ( 10 )] , and this risk is increased with higher doses or unapproved methods of administration, such as snorting or injection. Before prescribing Methylin, assess each patient’s risk for abuse, misuse, and addiction. Educate patients and their families about these risks, proper storage of the drug, and proper disposal of any unused drug. Throughout Methylin treatment, reassess each patient’s risk of abuse, misuse, and addiction and frequently monitor for signs and symptoms of abuse, misuse, and addiction [see Warnings and Precautions ( 5.1 ) and Drug Abuse and Dependence ( 9.2 )] . WARNING: ABUSE, MISUSE, AND ADDICTION See full prescribing information for complete boxed warning. Methylin has a high potential for abuse and misuse, which can lead to the development of a substance use disorder, including addiction. Misuse and abuse of CNS stimulants, including Methylin, can result in overdose and death ( 5.1 , 9.2 , 10 ): Before prescribing Methylin, assess each patient’s risk for abuse, misuse, and addiction. Educate patients and their families about these risks, proper storage of the drug, and proper disposal of any unused drug. Throughout treatment, reassess each patient’s risk and frequently monitor for signs and symptoms of abuse, misuse, and addiction.