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## Amoxicillin-Clavulanate Potassium ### Overview Amoxicillin-clavulanate potassium is a combination antibiotic consisting of amoxicillin, a penicillin-class antibiotic, and clavulanate potassium, a beta-lactamase inhibitor. It is effective against a broader spectrum of bacteria compared to amoxicillin alone, particularly those producing beta-lactamase enzymes. ### Primary Indications * Bacterial sinusitis * Acute otitis media * Lower respiratory tract infections (e.g., community-acquired pneumonia, acute bacterial exacerbations of chronic bronchitis) * Urinary tract infections * Skin and soft tissue infections ### Adult Dosing Dosing depends on the severity and type of infection. Common regimens include: * **Mild-to-moderate infections:** 500 mg amoxicillin/125 mg clavulanate orally every 12 hours or 250 mg amoxicillin/125 mg clavulanate orally every 8 hours. * **Severe infections:** 875 mg amoxicillin/125 mg clavulanate orally every 12 hours. * **Dosage is based on the amoxicillin component.** ### Pediatric Dosing Dosing is based on amoxicillin weight-based recommendations and varies by indication and severity. * **Mild-to-moderate infections:** 25 mg/kg/day to 45 mg/kg/day divided into two doses every 12 hours or 125 mg/5 mL or 250 mg/5 mL suspension. * **Severe infections:** For children weighing 40 kg or more, use adult doses. For children less than 40 kg, the dose is typically 45 mg/kg/day divided every 12 hours. * **Specific formulations have varying concentrations (e.g., 125/31.25 mg per 5 mL, 200/28.5 mg per 5 mL, 400/57 mg per 5 mL).** * **Acute otitis media, sinusitis, and lower respiratory tract infections:** 90 mg/kg/day of amoxicillin component, divided every 12 hours. **This specific dose is higher and may have a lower upper limit than other indications.** Follow local guidelines or product labeling for exact milligram per kilogram dosing for specific suspensions. ### Dose Adjustments * **Renal Impairment:** Dosage adjustment is necessary for creatinine clearance less than 30 mL/min. Consult product labeling or pharmacy resources for specific adjustments based on CrCl. ### Contraindications * Known serious hypersensitivity to penicillin or amoxicillin-clavulanate potassium. * History of jaundice or hepatic dysfunction associated with amoxicillin-clavulanate potassium use. ### Adverse Effects * **Common:** Diarrhea, nausea, vomiting, rash, urticaria. * **Serious:** Severe diarrhea or colitis (Clostridioides difficile-associated diarrhea), severe hypersensitivity reactions (anaphylaxis), hepatic dysfunction (cholestatic jaundice, hepatitis), erythema multiforme, Stevens-Johnson syndrome. ### Key Drug Interactions * **Probenecid:** May increase amoxicillin serum levels, potentially increasing risk of toxicity. * **Warfarin:** May increase INR; monitor INR closely. * **Oral contraceptives:** May decrease efficacy; consider alternative contraception. * **Mycophenolate mofetil:** May decrease mycophenolic acid concentrations; monitor for loss of efficacy. ### Monitoring * **Renal function:** Essential for patients with renal impairment. * **Liver function:** Monitor for signs of hepatic dysfunction, especially with prolonged therapy or in patients with a history of liver issues. * **Signs and symptoms of C. difficile infection:** Diarrhea, abdominal pain, fever. * **Allergic reactions:** Monitor for rash, pruritus, and signs of anaphylaxis. ### Clinical Pearls * **Take with or without food.** Taking with food may help reduce gastrointestinal upset. * **Complete the full course of therapy** even if symptoms improve. * **Patient counseling** on potential for diarrhea and the importance of reporting severe or persistent diarrhea. * **Avoid use if previous amoxicillin-clavulanate therapy was associated with liver issues.** *** **Disclaimer:** This information is intended for educational purposes only and does not substitute professional medical advice. Always consult the most current prescribing information, drug compendia, or your pharmacist for definitive guidance on drug use, dosing, and safety. Dosing recommendations may vary based on local protocols and specific patient factors.