Amoxicillin and Clavulanate Potassium

1 INDICATIONS AND USAGE Amoxicillin and clavulanate potassium extended-release tablets is indicated for the treatment of infections in adults and pediatric patients weighing greater than or equal to 40 kg who are able to swallow tablets with: community-acquired pneumonia or acute bacterial sinusitis due to confirmed, or suspected β-lactamase-producing pathogens (i.e., H. influenzae, M. catarrhalis, H. parainfluenzae, K. pneumoniae , or methicillin-susceptible S. aureus ) and S. pneumoniae with reduced susceptibility to penicillin (i.e., penicillin MICs equal to 2 mcg/mL). Limitations of Use Amoxicillin and clavulanate potassium extended-release tablets is not indicated for the treatment of infections due to S. pneumoniae with penicillin MICs greater than or equal to 4 mcg/mL. Data are limited with regard to infections due to S. pneumoniae with penicillin MICs greater than or equal to 4 mcg/mL [see Clinical Studies ( 14 )] . Usage To reduce the development of drug-resistant bacteria and maintain the effectiveness of amoxicillin and clavulanate potassium extended-release tablets and other antibacterial drugs, amoxicillin and clavulanate potassium extended-release tablets should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they 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. In patients with community-acquired pneumonia in whom penicillin-resistant S. pneumoniae is suspected, bacteriological studies should be performed to determine the causative organisms and their susceptibility when amoxicillin and clavulanate potassium extended-release tablets are prescribed. Acute bacterial sinusitis or community-acquired pneumonia due to a penicillin-susceptible strain of S. pneumoniae plus a β-lactamase-producing pathogen can be treated with another amoxicillin and clavulanate potassium product containing lower daily doses of amoxicillin (i.e., 500 mg every 8 hours or 875 mg every 12 hours). Acute bacterial sinusitis or community-acquired pneumonia due to S. pneumoniae alone can be treated with amoxicillin. Amoxicillin and clavulanate potassium extended-release tablets is a combination of amoxicillin, a penicillin-class antibacterial and clavulanate potassium, a β-lactamase inhibitor, indicated for treatment of adults and pediatric patients weighing greater than or equal to 40 kg who are able to swallow tablets with: community-acquired pneumonia or acute bacterial sinusitis due to confirmed, or suspected β-lactamase-producing pathogens (i.e., H. influenzae, M. catarrhalis, H. parainfluenzae, K. pneumoniae , or methicillin-susceptible S. aureus ) and S. pneumoniae with reduced susceptibility to penicillin (i.e., penicillin MICs equal to 2 mcg/mL). ( 1 ) Limitations of Use Amoxicillin and clavulanate potassium extended-release tablets is not indicated for the treatment of infections due to S. pneumoniae with penicillin MICs greater than or equal to 4 mcg/mL. Data are limited with regard to infections due to S. pneumoniae with penicillin MICs greater than or equal to 4 mcg/mL. ( 1 ) Usage To reduce the development of drug-resistant bacteria and maintain the effectiveness of amoxicillin and clavulanate potassium extended-release tablets and other antibacterial drugs, amoxicillin and clavulanate potassium extended-release tablets should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. ( 1 )

2 DOSAGE AND ADMINISTRATION Adults and Pediatric Patients weighing greater than or equal to 40 kg who are able to swallow tablets: The recommended dosage of amoxicillin and clavulanate potassium extended-release tablets is 4,000 mg/250 mg daily in divided doses at the start of a meal according to the following table ( 2 ): Indication Dose Duration Acute bacterial sinusitis Two (1,000 mg/62.5 mg) tablets every 12 hours 10 days Community-acquired pneumonia Two (1,000 mg/62.5 mg) tablets every 12 hours 7 to 10 days 2.1 Important Administration Instructions Amoxicillin and clavulanate potassium extended-release tablets should be taken at the start of a meal to enhance the absorption of amoxicillin and to minimize the potential for gastrointestinal intolerance. Amoxicillin and clavulanate potassium extended-release tablets is not recommended to be taken with a high-fat meal because clavulanate absorption is decreased [see Clinical Pharmacology ( 12.3 )] . 2.2 Dosage in Adult Patients The recommended dosage of amoxicillin and clavulanate potassium extended-release tablets is 4,000 mg/250 mg daily in divided doses according to the following table: Table 1: Recommended Dosage of Amoxicillin and Clavulanate Potassium Extended-Release Tablets in Adult Patients Indication Dose Duration Acute bacterial sinusitis Two (1,000 mg/62.5 mg) tablets every 12 hours 10 days Community-acquired pneumonia Two (1,000 mg/62.5 mg) tablets every 12 hours 7 to 10 days Amoxicillin and clavulanate potassium extended-release tablets can be split in half along the score line for patients with difficulty swallowing the tablets whole. Both halves of the tablet must be taken immediately. 2.3 Dosage in Pediatric Patients Pediatric patients who weigh 40 kg or more and can swallow tablets should receive the adult dose [see Dosage and Administration ( 2.2 ) and Use in Specific Populations ( 8.4 )] . 2.4 Dosage in Patients with Hepatic Impairment Hepatically impaired patients should be dosed with caution and hepatic function monitored at regular intervals [see Warnings and Precautions ( 5.4 )]. 2.5 Switching between Dosage Forms and between Strengths Amoxicillin and clavulanate potassium extended-release tablet is NOT substitutable on a mg-to-mg basis with other formulations of amoxicillin and clavulanate potassium. In addition, the extended-release tablets provide an extended time course of plasma amoxicillin concentrations compared to immediate-release tablets. Thus, two amoxicillin and clavulanate potassium 500 mg tablets are not equivalent to one amoxicillin and clavulanate potassium extended-release 1,000 mg tablet.

5 WARNINGS AND PRECAUTIONS Serious (including fatal) hypersensitivity reactions: Discontinue amoxicillin and clavulanate potassium extended-release tablets if a reaction occurs and institute appropriate therapy. ( 5.1 ) Severe cutaneous adverse reactions (SCAR): Monitor closely. Discontinue if rash progresses. ( 5.2 ) Drug-induced enterocolitis syndrome (DIES) has been reported with use of amoxicillin, a component of amoxicillin and clavulanate potassium extended-release tablets. If this occurs, discontinue amoxicillin and clavulanate potassium extended-release tablets and institute appropriate therapy. ( 5.3 ) Hepatic dysfunction and cholestatic jaundice: Discontinue if signs/symptoms of hepatitis occur. Monitor liver function tests in patients with hepatic impairment. ( 5.4 ) Clostridioides difficile -associated diarrhea (CDAD): Evaluate patients if diarrhea occurs. ( 5.5 ) Patients with mononucleosis who receive amoxicillin and clavulanate potassium extended-release tablets develop skin rash. Avoid amoxicillin and clavulanate potassium extended-release tablets use in these patients. ( 5.6 ) 5.1 Serious Allergic Reactions, Including Anaphylaxis Serious and occasionally fatal hypersensitivity (anaphylactic) reactions have been reported in patients receiving amoxicillin and clavulanate potassium extended-release tablets. These reactions are more likely to occur in individuals with a history of penicillin hypersensitivity and/or a history of sensitivity to multiple allergens. Before initiating therapy with amoxicillin and clavulanate potassium extended-release tablets, careful inquiry should be made regarding previous hypersensitivity reactions to penicillins, cephalosporins, or other allergens. If an allergic reaction occurs, discontinue amoxicillin and clavulanate potassium extended-release tablets and institute appropriate therapy. 5.2 Severe Cutaneous Adverse Reactions Amoxicillin and clavulanate potassium extended-release tablets may cause severe cutaneous adverse reactions (SCAR), such as Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP). If patients develop a skin rash, they should be monitored closely, and amoxicillin and clavulanate potassium extended-release tablets discontinued if lesions progress. 5.3 Drug-Induced Enterocolitis Syndrome (DIES) Drug-induced enterocolitis syndrome (DIES) has been reported with use of amoxicillin, a component of amoxicillin and clavulanate potassium extended-release tablets [see Adverse Reactions ( 6.2 )] , with most cases occurring in pediatric patients ≤18 years of age. DIES is a non-IgE mediated hypersensitivity reaction characterized by protracted vomiting occurring 1 to 4 hours after drug ingestion in the absence of skin or respiratory symptoms. DIES may be associated with pallor, lethargy, hypotension, shock, diarrhea within 24 hours after ingesting amoxicillin, and leukocytosis with neutrophilia. If DIES occurs, discontinue amoxicillin and clavulanate potassium extended-release tablets and institute appropriate therapy. 5.4 Hepatic Dysfunction Use amoxicillin and clavulanate potassium extended-release tablets with caution in patients with evidence of hepatic dysfunction. Hepatic toxicity associated with the use of amoxicillin and clavulanate potassium extended-release tablets is usually reversible. Deaths have been reported (fewer than one death reported per estimated four million prescriptions worldwide). These have generally been cases associated with serious underlying diseases or concomitant medications [see Contraindications ( 4.2 ), and Adverse Reactions ( 6.2 )]. 5.5 Clostridioides difficile -Associated Diarrhea (CDAD) Clostridioides difficile- associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including amoxicillin and clavulanate potassium extended- release tablets, and may range in severity from mild…

4 CONTRAINDICATIONS History of a serious hypersensitivity reaction (e.g., anaphylaxis or Stevens-Johnson syndrome) to amoxicillin and clavulanate potassium extended-release tablets or to other β‑lactams (e.g., penicillins or cephalosporins). ( 4.1 ) History of cholestatic jaundice/hepatic dysfunction associated with amoxicillin and clavulanate potassium extended-release tablets. ( 4.2 ) In patients with severe renal impairment (creatinine clearance less than 30 mL/min) and in hemodialysis patients. ( 4.3 ) 4.1 Serious Hypersensitivity Reactions Amoxicillin and clavulanate potassium extended-release tablets is contraindicated in patients with a history of serious hypersensitivity reactions (e.g., anaphylaxis or Stevens-Johnson syndrome) to amoxicillin, clavulanate or to other β-lactam antibacterial drugs (e.g., penicillins and cephalosporins). 4.2 Cholestatic Jaundice/Hepatic Dysfunction Amoxicillin and clavulanate potassium extended-release tablets is contraindicated in patients with a previous history of cholestatic jaundice/hepatic dysfunction associated with treatment with amoxicillin/clavulanate potassium. 4.3 Renal Impairment Amoxicillin and clavulanate potassium extended-release tablets is contraindicated in patients with severe renal impairment (creatinine clearance less than 30 mL/min) and in hemodialysis patients.

7 DRUG INTERACTIONS Co-administration with probenecid is not recommended. ( 7.1 ) Concomitant use of amoxicillin and clavulanate potassium extended-release tablets and oral anticoagulants may increase the prolongation of prothrombin time. ( 7.2 ) Co-administration with allopurinol increases the risk of rash. ( 7.3 ) Amoxicillin and clavulanate potassium extended-release tablets may reduce efficacy of oral contraceptives. ( 7.4 ) 7.1 Probenecid Probenecid decreases the renal tubular secretion of amoxicillin. Concurrent use with amoxicillin and clavulanate potassium extended-release tablets may result in increased and prolonged blood levels of amoxicillin. Co-administration of probenecid is not recommended. 7.2 Oral Anticoagulants Abnormal prolongation of prothrombin time (increased international normalized ratio [INR]) has been reported in patients receiving amoxicillin and oral anticoagulants. Appropriate monitoring should be undertaken when anticoagulants are prescribed concurrently. Adjustments in the dose of oral anticoagulants may be necessary to maintain the desired level of anticoagulation. 7.3 Allopurinol The concurrent administration of allopurinol and amoxicillin substantially increases the incidence of rashes in patients receiving both drugs as compared to patients receiving amoxicillin alone. It is not known whether this potentiation of amoxicillin rashes is due to allopurinol or the hyperuricemia present in these patients. In controlled clinical trials of amoxicillin and clavulanate potassium extended-release tablets, 25 patients received concomitant allopurinol and amoxicillin and clavulanate potassium extended-release tablets. No rashes were reported in these patients. However, this sample size is too small to allow for any conclusions to be drawn regarding the risk of rashes with concomitant amoxicillin and clavulanate potassium extended-release tablets and allopurinol use. 7.4 Oral Contraceptives Amoxicillin and clavulanate potassium extended-release tablets may affect intestinal flora, leading to lower estrogen reabsorption and reduced efficacy of combined oral estrogen/progesterone contraceptives. 7.5 Effects on Laboratory Tests High urine concentrations of amoxicillin may result in false-positive reactions when testing for the presence of glucose in urine using CLINITEST ® , Benedict’s Solution, or Fehling’s Solution. Since this effect may also occur with amoxicillin and clavulanate potassium extended release tablets, it is recommended that glucose tests based on enzymatic glucose oxidase reactions be used. Following administration of amoxicillin to pregnant women, a transient decrease in plasma concentration of total conjugated estriol, estriol-glucuronide, conjugated estrone, and estradiol has been noted

8.1 Pregnancy Risk Summary Available data from published epidemiologic studies and pharmacovigilance case reports over several decades of use with amoxicillin and clavulanate during pregnancy have not established a drug-associated risk of major birth defects, miscarriage, or adverse maternal outcomes. A study in women with preterm prelabor rupture of membranes (PPROM) reported that prophylactic treatment with amoxicillin and clavulanate may be associated with an increased risk of necrotizing enterocolitis in neonates (see Data). Reproduction studies performed in pregnant rodents, given oral doses up to approximately 1.6 times the amount of amoxicillin and 13 times the amount of clavulanate in the Maximum Human Recommended Dose (MHRD) of amoxicillin and clavulanate potassium extended-release tablets, revealed no evidence of harm to the fetus (see Data). The background risk of major birth defects and miscarriage for the indicated populations 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. Data Human Data One randomized, controlled trial included 4,826 pregnant women with premature rupture of fetal membranes who were randomly assigned to 250 mg erythromycin (n=1,197), 250 mg amoxicillin and 125 mg clavulanic acid (amoxicillin and clavulanate, n=1,212), amoxicillin and clavulanate and erythromycin (n=1,192), or placebo (n=1,225) four times daily for 10 days or until delivery. Amoxicillin and clavulanate was associated with a significantly increased rate of proven neonatal necrotizing enterocolitis: 1.9% (n = 24) in the amoxicillin and clavulanate only group versus 0.5% (n = 6) in the placebo group (p = 0.001), and 1.8% (n = 44) in the any amoxicillin and clavulanate group versus 0.7% (n =17) in the no amoxicillin and clavulanate group (p = 0.0005). Animal Data Reproduction studies performed in pregnant rats and mice given amoxicillin and clavulanate (2:1 ratio formulation) at oral doses up to 1,200 mg/kg/day revealed no evidence of harm to the fetus due to amoxicillin and clavulanate. In terms of body surface area, the doses in rats were 1.6 times the Maximum Human Recommended Dose (MHRD) of amoxicillin and 13 times the MHRD for clavulanate in amoxicillin and clavulanate potassium extended-release tablets. For mice, these doses were 0.9 and 7.4 times the MHRD of amoxicillin and clavulanate, respectively.

6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Anaphylactic reactions [se e Warnings and Precautions ( 5.1 )] Severe Cutaneous Adverse Reactions [see Warnings and Precautions ( 5.2 )] Drug-Induced Enterocolitis Syndrome (DIES) [see Warnings and Precautions ( 5.3 )] Hepatic Dysfunction [see Warnings and Precautions ( 5.4 )] Clostridioides difficile -associated diarrhea (CDAD) [se e Warnings and Precautions ( 5.5 )] Skin Rash in Patients with Mononucleosis [see Warnings and Precautions ( 5.6 )] The most frequently reported adverse reactions were (incidence > 2%), diarrhea, vaginal mycosis, nausea, and loose stools. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Sandoz Inc. at 1-800-525-8747 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, 5,643 patients have been treated with amoxicillin and clavulanate potassium extended-release tablets. The most frequently reported adverse reactions which were suspected or probably drug- related were diarrhea (15%), vaginal mycosis (3%), nausea (2%), and loose stools (2%). Amoxicillin and clavulanate potassium extended-release tablets had a higher rate of diarrhea which required corrective therapy (4% versus 3% for amoxicillin and clavulanate potassium extended-release tablets and all comparators, respectively). Two percent of patients discontinued therapy because of drug-related adverse reactions. 6.2 Postmarketing Experience The following adverse reactions have been identified during post-marketing use of amoxicillin and clavulanate potassium products, including amoxicillin and clavulanate potassium extended-release tablets. 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. Gastrointestinal : Drug-induced enterocolitis syndrome (DIES), diarrhea, nausea, vomiting, indigestion, gastritis, stomatitis, glossitis, black “hairy” tongue, mucocutaneous candidiasis, enterocolitis and hemorrhagic/pseudomembranous colitis. Onset of pseudomembranous colitis symptoms may occur during or after antibacterial treatment [ see Warnings and Precautions ( 5.3 , 5.5 )]. Immune: Hypersensitivity reactions, anaphylactic/anaphylactoid reactions (including shock), angioedema, serum sickness-like reactions (urticaria or skin rash accompanied by arthritis, arthralgia, myalgia, and frequently fever), hypersensitivity vasculitis [see Warnings and Precautions ( 5.1 )] . Skin and Appendages: Rashes, pruritus, urticaria, erythema multiforme, SJS, TEN, DRESS, AGEP, exfoliative dermatitis, and linear IgA bullous dermatosis [see Warnings and Precautions ( 5.1 , 5.2 , 5.6 )] . Liver : A moderate rise in AST (SGOT) and/or ALT (SGPT) has been noted in patients treated with ampicillin-class antibacterials, but the significance of these findings is unknown. Hepatic dysfunction, including hepatitis and cholestatic jaundice, [see Contraindications ( 4.2 )], increases in serum transaminases (AST and/or ALT), serum bilirubin, and/or alkaline phosphatase, has been reported with amoxicillin and clavulanate potassium or amoxicillin and clavulanate potassium extended-release tablets. It has been reported more commonly in the elderly, in males, or in patients on prolonged treatment. The histologic findings on liver biopsy have consisted of predominantly cholestatic, hepatocellular, or mixed cholestatic-hepatocellular changes. The onset of signs/symptoms of hepatic dysfunction may occur during or several weeks after therapy has been discontinued. The hepatic dysfunction, which may be severe, is usually rev…