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# Amoxicillin-Clavulanate
## Overview
Amoxicillin-clavulanate (Augmentin) is a combination penicillin-class antibiotic (amoxicillin) and beta-lactamase inhibitor (clavulanate potassium). The addition of clavulanate expands the spectrum of activity to include beta-lactamase-producing bacteria.
## Primary Indications
Used for infections likely caused by beta-lactamase-producing organisms, including:
* Acute bacterial rhinosinusitis
* Community-acquired pneumonia
* Otitis media
* Skin and skin structure infections
* Urinary tract infections
* Animal/human bite prophylaxis and treatment
## Adult Dosing
Standard dosing is typically 500 mg or 875 mg (amoxicillin component) every 12 hours.
* **Respiratory/Severe infections:** 875 mg every 12 hours or 2000 mg (extended-release) every 12 hours.
* **Prophylaxis (Bites):** 875 mg every 12 hours for 3–5 days.
* *Note: Always base "mg" on the amoxicillin component.*
## Pediatric Dosing
Based on the amoxicillin component:
* **Standard:** 25 mg/kg/day divided every 12 hours (using 200 mg/5 mL or 400 mg/5 mL suspensions).
* **Otitis Media / Severe Infections:** 80–90 mg/kg/day divided every 12 hours.
* *Note: Use the specific ratio formulation (e.g., 600 mg/5 mL) to ensure the clavulanate dose does not exceed maximums.*
## Dose Adjustments
* **Renal Impairment:** Adjustments required for CrCl < 30 mL/min. Contraindicated in hemodialysis patients for ER formulations.
* **Hepatic Impairment:** Use with caution; monitor liver function.
## Contraindications
* History of serious hypersensitivity (anaphylaxis) to any penicillin.
* History of cholestatic jaundice or hepatic dysfunction associated with previous amoxicillin-clavulanate use.
## Adverse Effects
* **Gastrointestinal:** Diarrhea (very common), nausea, vomiting.
* **Hepatic:** Elevated LFTs, cholestatic jaundice (rare, associated with increased age and prolonged use).
* **Dermatologic:** Rash (monitor for IgE-mediated reactions).
* **Other:** *C. difficile*-associated diarrhea, candidiasis.
## Key Drug Interactions
* **Methotrexate:** May increase serum levels/toxicity of methotrexate.
* **Warfarin:** May increase INR and bleeding risk.
* **Oral Contraceptives:** Potential for decreased efficacy (use backup contraception).
* **Probenecid:** Decreases renal tubular secretion of amoxicillin, increasing blood levels.
## Monitoring
* Monitor for signs of hypersensitivity (rash, pruritus).
* Assess stools for severe/persistent diarrhea (*C. difficile*).
* Baseline and periodic LFTs if patient has underlying hepatic issues.
## Clinical Pearls
* **Ratio Matters:** Formulations come in different ratios (e.g., 4:1 vs 7:1). A 250 mg tablet and a 250 mg chewable tablet are NOT interchangeable because they contain different amounts of clavulanate.
* **Diarrhea Management:** Take with a meal to reduce GI upset. Reduce the clavulanate burden by utilizing the 875 mg tablet rather than two 500 mg tablets.
* **Penicillin Allergy:** If the patient has a history of a non-IgE mediated, mild rash, consultation with an allergy specialist may be warranted before re-challenging. If anaphylaxis history exists, avoid all penicillins.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical dosing, specific pediatric protocols, and contraindications must be verified against current institutional guidelines or official prescribing information (e.g., package inserts) before clinical application. Always consult a pharmacist or physician regarding specific patient cases.
