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# Amoxicillin-Clavulanate (Amox-Clav) ## Overview Amoxicillin-clavulanate is a combination penicillin-class antibiotic consisting of amoxicillin (a beta-lactam antibacterial) and clavulanate potassium (a beta-lactamase inhibitor). The addition of clavulanate expands the spectrum of activity to include beta-lactamase-producing organisms. ## Primary Indications * Acute bacterial rhinosinusitis * Community-acquired pneumonia * Skin and soft tissue infections (including animal/human bites) * Otitis media * Urinary tract infections * Dental infections ## Adult Dosing * **Mild to Moderate Infections:** 500 mg/125 mg orally every 12 hours OR 250 mg/125 mg every 8 hours. * **Severe Infections/Respiratory Tract Infections:** 875 mg/125 mg orally every 12 hours. * **Extended-release (XR) formulation:** 2000 mg/125 mg orally every 12 hours (only for specific indications like refractory sinusitis or community-acquired pneumonia). ## Pediatric Dosing * **Otitis Media/Pneumonia:** 90 mg/kg/day (based on the amoxicillin component) divided every 12 hours (using the 600 mg/5 mL suspension). * **Maximum:** Follow specific weight-based guidelines; generally, do not exceed adult daily maximums. * **Note:** Always verify the concentration of the suspension, as different strengths exist. ## Dose Adjustments * **Renal Impairment:** Requires dose adjustment if CrCl < 30 mL/min. Avoid the 875 mg tablet in patients with severe renal impairment (CrCl < 30 mL/min). * **Hepatic Impairment:** Use with caution; monitor hepatic function. ## Contraindications * History of serious hypersensitivity reactions (e.g., anaphylaxis, Stevens-Johnson syndrome) to amoxicillin, other penicillins, or cephalosporins. * History of cholestatic jaundice or hepatic dysfunction associated with previous use of amoxicillin-clavulanate. ## Adverse Effects * **Most Common:** Diarrhea (frequently associated with the clavulanate component), nausea, vomiting, and abdominal pain. * **Serious:** Severe cutaneous adverse reactions (SCAR), *Clostridioides difficile*-associated diarrhea, and idiosyncratic hepatotoxicity. ## Key Drug Interactions * **Warfarin:** May increase INR/bleeding risk; monitor INR closely. * **Methotrexate:** Penicillins may decrease renal clearance of methotrexate, potentially leading to toxicity. * **Probenecid:** Increases and prolongs serum levels of amoxicillin; use requires monitoring. * **Oral Contraceptives:** May reduce efficacy; backup contraception is recommended during therapy. ## Monitoring * Monitor for signs of hypersensitivity (rash, wheezing). * Monitor renal and hepatic function during prolonged therapy. * Observe for persistent watery/bloody stools (potential *C. difficile* colitis). ## Clinical Pearls * **Administration:** Take with meals or a snack to reduce gastrointestinal upset and maximize absorption. * **Clavulanate-to-Amoxicillin Ratio:** Ensure the correct formulation is selected; the 250 mg and 500 mg tablets contain the same amount of clavulanate (125 mg). Do not substitute two 250 mg tablets for one 500 mg tablet as this will exceed the recommended dose of clavulanate. * **Formulation Choice:** The 600 mg/5 mL suspension is specifically designed for pediatric high-dose therapy; ensure pharmacies do not substitute with lower-strength suspensions. *** **Educational Disclaimer:** This information is for educational purposes only. Clinical practice protocols vary by institution and region. Always verify specific dosages, indications, and patient-specific factors with the most recent clinical guidelines and official prescribing information before administration.