Cephalexin

6 ADVERSE REACTIONS The following serious events are described in greater detail in the Warning and Precautions section: Hypersensitivity reactions [ see Warning and Precautions ( 5.1 ) ] Clostridium difficile-associated diarrhea [ see Warnings and Precautions ( 5.2 ) ] Direct Coombs’ Test Seroconversion [ see Warnings and Precautions ( 5.3 ) ] Seizure Potential [ see Warnings and Precautions ( 5.4 ) ] Effect on Prothrombin Activity [ see Warnings and Precautions ( 5.5 ) ] Development of Drug-Resistant Bacteria [ see Warnings and Precautions ( 5.6 ) ] The most common adverse reactions associated with cephalexin include diarrhea, nausea, vomiting, dyspepsia and abdominal pain. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Ascend Laboratories, LLC at 1-877-ASC-RX01 (877-272-7901) 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 In clinical trials, the most frequent adverse reaction was diarrhea. Nausea and vomiting, dyspepsia, gastritis, and abdominal pain have also occurred. As with penicillins and other cephalosporins, transient hepatitis and cholestatic jaundice have been reported. Other reactions have included hypersensitivity reactions, genital and anal pruritus, genital candidiasis, vaginitis and vaginal discharge, dizziness, fatigue, headache, agitation, confusion, hallucinations, arthralgia, arthritis, and joint disorder. Reversible interstitial nephritis has been reported. Eosinophilia, neutropenia, thrombocytopenia, hemolytic anemia, and slight elevations in aspartate transaminase (AST) and alanine transaminase (ALT) have been reported. In addition to the adverse reactions listed above that have been observed in patients treated with cephalexin, the following adverse reactions and other altered laboratory tests have been reported for cephalosporin class antibacterial drugs: Other Adverse Reactions: Fever, colitis, aplastic anemia, hemorrhage, renal dysfunction, and toxic nephropathy. Altered Laboratory Tests: Prolonged prothrombin time, increased blood urea nitrogen (BUN), increased creatinine, elevated alkaline phosphatase, elevated bilirubin, elevated lactate dehydrogenase (LDH), pancytopenia, leukopenia, and agranulocytosis.

4 CONTRAINDICATIONS Cephalexin is contraindicated in patients with known hypersensitivity to cephalexin or other members of the cephalosporin class of antibacterial drugs. Patients with known hypersensitivity to cephalexin or other members of the cephalosporin class of antibacterial drugs. ( 4)

11 DESCRIPTION Cephalexin capsules, USP is a semisynthetic cephalosporin antibacterial drug intended for oral administration. It is 7-(D-α-Amino-α-phenylacetamido)-3-methyl-3-cephem-4-carboxylic acid monohydrate. Cephalexin has the molecular formula C 16 H 17 N 3 O 4 S•H 2 Oand the molecular weight is 365.41. Cephalexin has the following structural formula: Each capsule contains cephalexin monohydrate equivalent to 250 mg, 333 mg, 500 mg, or 750 mg of cephalexin. The 250 mg, 333 mg, 500 mg and 750 mg capsules contain anhydrous lactose, colloidal silicon dioxide, magnesium stearate, FD & C Blue No. 1, D & C Yellow No. 10, gelatin, sodium lauryl sulphate, titanium dioxide. In addition, the 250 mg capsule contains FD & C Red No. 40; 333 mg and 750 mg Capsules contains FD & C Yellow No. 6. The imprinting ink contains; shellac, propylene glycol, strong ammonia solution and potassium hydroxide. Also black Iron oxide is used in 250mg, 333mg and 500mg and titanium dioxide is used in 750mg. cephalexin-str

2 DOSAGE & ADMINISTRATION Adults and patients at least 15 years of age T he usual dose is 250 mg every 6 hours, but a dose of 5 00 mg every 12 hours may be administered ( 2. 1 ) Pediatric patients (over 1 year of age) Otitis media: 75 to 100 m g/kg in equally divided d oses every 6 hours ( 2. 2 ) All other indicati ons: 25 to 50 m g/kg given in equally divided d oses ( 2. 2 ) In severe infections: 50 to 100 m g/kg m ay be a d ministered in e qually divided doses ( 2. 2 ) Duration of therapy ranges from 7 to14 days depending on the infection type and severity. ( 2 ) Dosage adjustment is required in patients with severe and end stage renal disease (ESRD) defined as creatinine clearance below 30 mL/min. ( 2. 3 ) 2.1 Adults and Pediatric Patients at Least 15 Years of Age The usual dose of oral Cephalexin capsule, USP is 250 mg every 6 hours, but a dose of 500 mg every 12 hours may be administered. Treatment is administered for 7 to 14 days. For more severe infections larger doses of oral Cephalexin capsules, USP may be needed, up to 4 grams daily in two to four equally divided doses. 2.2 Pediatric Patients (over 1 year of age) The recommended total daily doseof oral Cephalexin capsules, USP for pediatric patients is 25 to 50 mg/kg givenin equally divided doses for 7 to 14 days. In the treatment of β-hemolyticstreptococcal infections, duration of at least 10 days is recommended. Insevere infections, a total daily dose of 50 to 100 mg/kg may be administered inequally divided doses. For thetreatment of otitis media, the recommended daily dose is 75 to 100 mg/kg givenin equally divided doses. 2.3 Dosage Adjustments in Adult and Pediatric Patients at Least 15 Years of Age With Renal Impairment Administer the following dosing regimens for Cephalexin capsules, USP to patients with impaired renal function [see War nin gsand Precautions (5.4) and Use inSpecific Populations (8.6 ) ] . Table 1. Recommended Dose Regimen for Patients with Renal Impairment Renal Function Dose regimen recommendation Creatinine cleartance ≥ 60mL/min. No dose adjustment Creatinine clearance 30 to 59 mL / min No dose adjustment; maximum daily dose should not exceed 1 g Creati nine clearance 15 to 29 mL / min 250 mg, every 8 hours or every 12 hours Creati nine clearance 5 to 14 mL / min not yet on dialysis* 250 mg, every 24 hours Creati nine clearance 1 to 4 mL / min not yet on dialysis* 250 mg, every 48 hours or every 60 hours *There is insufficient information to make dose adjustment recommendations in patients on hemodialysis.

1 INDICATIONS & USAGE Cephalexin is a cephalosporin antibacterial drug indicated for the treatment of the following infections caused by susceptible isolates of designated bacteria: Respiratory tract infection ( 1.1 ) Otitis media ( 1.2 ) Skin and skin structure infections ( 1.3 ) Bone infections ( 1 . 4 ) Genitourinary tract infections ( 1.5 ) To reduce the development of drug-resistant bacteria and maintain the effectiveness of cephalexin and other antibacterial drugs, Cephalexin should be used only to treat infections that are proven or strongly suspected to be caused by bacteria. (1.6) 1.1 Respiratory Tract Infections Cephalexin is indicated for the treatment of respiratory tract infections caused by susceptible isolates of Streptococcus pneumoniae and Streptococcuspyogenes. 1.2 Otitis Media Cephalexin is indicated for the treatment of otitis media caused by susceptible isolates of Streptococcuspneumoniae, Haemophilus infl uenz ae, Staphylococcus aureus, Streptococcuspyogenes, and Mo raxella catarrhalis. 1.3 Skin and Skin Structure Infections Cephalexin is indicated for the treatment of skin and skin structure infections caused by susceptible isolates of the following Gram-positive bacteria: Staphylococcus aureus and Streptococcus pyogenes. 1.4 Bone Infections Cephalexin is indicated for the treat ment of bone infections caused by susceptible isolates of Staphylococcusaureus and Proteus mi rabilis. 1.5 Genitourinary Tract Infections Cephalexin is indicated for the treatment of genitourinary tract infections, including acute prostatitis, caused by susceptible isolates of Escheric hia c oli, Proteus mirabilis, and Klebsiella pneumonia e. 1.6 Usage To reduce the development of drug-resistant bacteria and maintain the effectiveness of cephalexin and other antibacterial drugs, Cephalexin should be used only to treat infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information is available, this information should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

10 OVERDOSAGE Symptoms of oral overdose may include nausea, vomiting, epigastric distress, diarrhea, and hematuria. In the event of an overdose, institute general supportive measures. Forced diuresis, peritoneal dialysis, hemodialysis, or charcoal hemoperfusion have not been established as beneficial for an overdose of cephalexin.

7 DRUG INTERACTIONS Metformin: increased metformin concentrations. Monitor for hypoglycemia. ( 7.1 ) Probenecid- The renal excretion of cephalexin is inhibited by probenecid. Co-administration of probenecid with cephalexin is not recommended. ( 7.2 ) Administration of cephalexin may result in a false-positive reaction for glucose in the urine. ( 7.3 ) 7.1 Metformin Administration of cephalexin with metformin results in increased plasma metformin concentrations and decreased renal clearance of metformin. Careful patient monitoring and dose adjustment of metformin is recommended in patients concomitantly taking cephalexin and metformin [ see Clinical Pharmacology (12.2) ]. 7.2 Probenecid The renal excretion of cephalexin is inhibited by probenecid. Co-administration of probenecid with cephalexin is not recommended. 7.3 Interaction With Laboratory or Diagnostic Testing A false-positive reaction may occur when testing for the presence of glucose in the urine using Benedict’s solution or Fehling’s solution.

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Cephalexin is a cephalosporin antibacterial drug [seeMicrobiology ( 12.4 ) ] . 12.3 Pharmacokinetics Absorption: Cephalexin is acid stable and may be given without regard to meals. Following doses of 250 mg, 500 mg, and 1 g, average peak serum levels of approximately 9, 18, and 32 mcg/mL, respectively, were obtained at 1 hour. Serum levels were detectable 6 hours after administration (at a level of detection of 0.2 mcg/mL). Distribution: Cephalexin is approximately 10% to 15% bound to plasma proteins. Excretion: Cephalexin is excreted in the urine by glomerular filtration and tubular secretion. Studies showed that over 90% of the drug was excreted unchanged in the urine within 8 hours. During this period, peak urine concentrations following the 250 mg, 500 mg, and 1 g doses were approximately 1000, 2200, and 5000 mcg/mL respectively. Drug Interactions In healthy subjects given single 500 mg doses of cephalexin and metformin, plasma metformin mean Cmax and AUC increased by an average of 34% and 24%, respectively, and metformin mean renal clearance decreased by 14%. No information is available about the interaction of cephalexin and metformin following multiple doses of either drug. 12.4 Microbiology Mechanism of Action Cephalexin is a bactericidal agent that acts by the inhibition of bacterial cell-wall synthesis. Resistance Methicillin-resistant staphylococci and most isolates of enterococci are resistant to cephalexin. Cephalexin is not active against most isolates of Enterobacter spp., Morganella morganii, and Proteus vulgaris. Cephalexin has no activity against Pseudomonas spp ., or Acinetobacter calcoaceticus . Penicillin-resistant Streptococcus pneumoniae is usually cross-resistant to beta-lactam antibacterial drugs. Antimicrobial Activity Cephalexin has been shown to be active against most isolates of the following bacteria both in vitro and in clinical infections [ see Indications and Usage (1) ]. Gram-positive bacteria Staphylococcus aureus (methicillin-susceptible isolates only) Streptococcus pneumoniae (penicillin-susceptible isolates) Streptococcus pyogenes Gram-negative bacteria Escheric h ia coli Haemophilusinfl uenzae Klebsiellapneumoniae Moraxella catarrhalis Proteusmi rabilis Susceptibility Tests Methods When available, the clinical microbiology laboratory should provide the results of in vitro susceptibility test results for antimicrobial drug products used in resident hospitals to the physician as periodic reports that describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports should aid the physician in selecting an antibacterial drug product for treatment. In cases of uncomplicated urinary tract infection only, susceptibility of E. coli, K. pneumoniae, and P. mirabilis to cephalexin may be inferred by testing cefazolin2. Dilution Techniques Quantitative methods are used to determine antimicrobial minimal inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized test methods (broth or agar)1,2. Diffusion Techniques Quantitative methods that require measurement of zone diameters also provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. The zone size provides an estimate of the susceptibility of bacteria to antimicrobial compounds. The zone size should be determined using a standardized test method2,3. A report of Susceptible (S) indicates that the antimicrobial drug is likely to inhibit growth of the pathogen if the antimicrobial drug reaches the concentration usually achievable at the site of infection. A report of Intermediate (I) indicates that the result should be considered equivocal, and if the microorganism is not fully susceptible to alternative clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug is physiologically concentrated or in situations where a high dosage of the drug can be used. This category also provides a buffer zone that prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of Resistant (R) indicates that the antimicrobial drug is not likely to inhibit growth of the pathogen if the antimicrobial drug reaches the concentrations usually achievable at the infection site; other therapy should be selected. Qualit y Co n t r ol Standardized susceptibility test procedures require the use of laboratory controls to monitor and ensure the accuracy and precision of supplies and reagents used in the assay, and the techniques of the individual performing the test 1 ,2,3 ,.

12.1 Mechanism of Action Cephalexin is a cephalosporin antibacterial drug [seeMicrobiology ( 12.4 ) ] .

12.3 Pharmacokinetics Absorption: Cephalexin is acid stable and may be given without regard to meals. Following doses of 250 mg, 500 mg, and 1 g, average peak serum levels of approximately 9, 18, and 32 mcg/mL, respectively, were obtained at 1 hour. Serum levels were detectable 6 hours after administration (at a level of detection of 0.2 mcg/mL). Distribution: Cephalexin is approximately 10% to 15% bound to plasma proteins. Excretion: Cephalexin is excreted in the urine by glomerular filtration and tubular secretion. Studies showed that over 90% of the drug was excreted unchanged in the urine within 8 hours. During this period, peak urine concentrations following the 250 mg, 500 mg, and 1 g doses were approximately 1000, 2200, and 5000 mcg/mL respectively. Drug Interactions In healthy subjects given single 500 mg doses of cephalexin and metformin, plasma metformin mean Cmax and AUC increased by an average of 34% and 24%, respectively, and metformin mean renal clearance decreased by 14%. No information is available about the interaction of cephalexin and metformin following multiple doses of either drug.

20230504

9

3 DOSAGE FORMS & STRENGTHS 250 mg capsules : a white to off white powder filled into size 2 capsules (dark green cap and dark green body) that are imprinted with “220” on the both cap and body in edible black ink. 500 mg capsules : a white to off white powder filled into size 0 capsules (light green cap and light green body) that are imprinted with “219” on the both cap and body in edible black ink. 333 mg capsules : a white to off white powder filled into size 1 capsules (light green cap and light green body) that are imprinted “CEP” on cap and “333” on body in edible black ink. 750 mg capsules : a white to off white powder filled into size '00 Elongated' capsules (dark green cap and dark green body) that are imprinted “CEP” on cap and “750” on body in edible white ink. Capsules: 250 m g, 333mg, 500 mg and 750 mg ( 3 )

Cephalexin Cephalexin ANHYDROUS LACTOSE MAGNESIUM STEARATE FD&C BLUE NO. 1 D&C YELLOW NO. 10 GELATIN SODIUM LAURYL SULFATE TITANIUM DIOXIDE SILICON DIOXIDE SHELLAC PROPYLENE GLYCOL AMMONIA POTASSIUM HYDROXIDE FERROSOFERRIC OXIDE CEPHALEXIN CEPHALEXIN ANHYDROUS light green cap and body 219

13.1 Carcinogenesis & Mutagenesis & Impairment Of Fertility Lifetime studies in animals have not been performed to evaluate the carcinogenic potential of cephalexin. Tests to determine the mutagenic potential of cephalexin have not been performed. In male and female rats, fertility and reproductive peLifetime studies in animals have not been performed to evaluate the carcinogenic potential of cephalexin. Tests to determine the mutagenic potential of cephalexin have not been performed. In male and female rats, fertility and reproductive performance were not affected by cephalexin oral doses up to 1.5 times the highest recommended human dose based upon body surface area.rformance were not affected by cephalexin oral doses up to 1.5 times the highest recommended human dose based upon mg/m2.

13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis & Mutagenesis & Impairment Of Fertility Lifetime studies in animals have not been performed to evaluate the carcinogenic potential of cephalexin. Tests to determine the mutagenic potential of cephalexin have not been performed. In male and female rats, fertility and reproductive peLifetime studies in animals have not been performed to evaluate the carcinogenic potential of cephalexin. Tests to determine the mutagenic potential of cephalexin have not been performed. In male and female rats, fertility and reproductive performance were not affected by cephalexin oral doses up to 1.5 times the highest recommended human dose based upon body surface area.rformance were not affected by cephalexin oral doses up to 1.5 times the highest recommended human dose based upon mg/m2.

ANDA090836

Cephalexin

Cephalexin

68071-4429

HUMAN PRESCRIPTION DRUG

ORAL

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL pdp

17 PATIENT COUNSELING INFORMATION Advise patients that allergic reactions, including serious allergic reactions, could occur and that serious reactions require immediate treatment. Ask the patient about any previous hypersensitivity reactions to cephalexin, other beta-lactams (including cephalosporins) or other allergens (5.1) Advise patients that diarrhea is a common problem caused by antibacterial drugs and usually resolves when the drug is discontinued. Sometimes, frequent watery or bloody diarrhea may occur and may be a sign of a more serious intestinal infection. If severe watery or bloody diarrhea develops, advise patients to contact their healthcare provider Counsel patients that antibacterial drugs including cephalexin, should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When cephalexin is prescribed to treat a bacterial infection, tell patients that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by cephalexin or other antibacterial drugs in the future. Manufactured by: Alkem Laboratories ltd. Mumbai - 400 013, India Distributed by: Ascend Laboratories, LLC Parsippany, NJ 07054 Revised: July 2016 PT 1199-08

15 REFERENCES 1. Clinical and Laboratory Standards Institute (CLSI). Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically; Approved Standard - Tenth Edition. CLSI document M07-A10, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA, 2015. 2. Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobials Susceptibility Tests; Twenty-Fifth Informational Supplement. CLSI document M100-S25, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA, 2015. 3. Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard - Twelfth Edition. CLSI document M02-A12, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA, 2015.

8.5 Geriatric Use Of the 701 subjects in 3 published clinical studies of cephalexin, 433 (62%) were 65 and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients. This drug is substantially excreted by the kidney, and the risk of toxic 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 [ see Warnings and Precautions ( 5.4 ) ].

8.3 Nursing Mothers Cephalexin is excreted in human milk. Caution should be exercised when Cephalexin is administered to a nursing woman.

8.4 Pediatric Use The safety and effectiveness of cephalexin in pediatric patients was established in clinical trials for the dosages described in the dosage and administration section [see Dosage and Administration ( 2.2 ) ] .

8.1 Pregnancy Pregnancy Category B There are no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Reproduction studies have been performed on mice and rats using oral doses of cephalexin monohydrate 0.6 and 1.5 times the maximum daily human dose (66 mg/kg/day) based upon body surface area basis, and have revealed no evidence of impaired fertility or harm to the fetus.

8 USE IN SPECIFIC POPULATIONS 8.1 Pregnancy Pregnancy Category B There are no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Reproduction studies have been performed on mice and rats using oral doses of cephalexin monohydrate 0.6 and 1.5 times the maximum daily human dose (66 mg/kg/day) based upon body surface area basis, and have revealed no evidence of impaired fertility or harm to the fetus. 8.3 Nursing Mothers Cephalexin is excreted in human milk. Caution should be exercised when Cephalexin is administered to a nursing woman. 8.4 Pediatric Use The safety and effectiveness of cephalexin in pediatric patients was established in clinical trials for the dosages described in the dosage and administration section [see Dosage and Administration ( 2.2 ) ] . 8.5 Geriatric Use Of the 701 subjects in 3 published clinical studies of cephalexin, 433 (62%) were 65 and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients. This drug is substantially excreted by the kidney, and the risk of toxic 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 [ see Warnings and Precautions ( 5.4 ) ]. 8.6 Renal Impairment Cephalexin should be administered with caution in the presence of impaired renal function (creatinine clearance < 30 mL/min, with or without dialysis). Under such conditions, careful clinical observation and laboratory studies renal function monitoring should be conducted because safe dosage may be lower than that usually recommended [see Dosage and Administration ( 2.3 ) ] .

16 HOW SUPPLIED/STORAGE AND HANDLING The 500 mg capsules are a white to off white powder filled into size 0 capsules (light green cap and light green body) that are imprinted with 219 on the both cap and body in edible black ink. They are available as follows: NDC 68071-4429-3 BOTTLES OF 3 NDC 68071-4429-4 BOTTLES OF 4 NDC 68071-4429-6 BOTTLES OF 6 NDC 68071-4429-9 BOTTLES OF 9 Store at 20°C to 25°C (68°F to77°F); excursions permitted to 15 to 30°C (59 to 86°F) [see USP Controlled Room Temperature].