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# Amoxicillin-Clavulanate
## Overview
Amoxicillin-clavulanate is a combination of a beta-lactam antibiotic (amoxicillin) and a beta-lactamase inhibitor (clavulanate potassium). The addition of clavulanate expands the spectrum of activity to include beta-lactamase-producing strains of *S. aureus*, *H. influenzae*, *M. catarrhalis*, and certain anaerobes.
## Primary Indications
* Acute bacterial rhinosinusitis
* Community-acquired pneumonia
* Skin and skin structure infections (SSSIs)
* Bite wounds (human, dog, cat)
* Acute otitis media (AOM)
* Urinary tract infections (UTIs)
## Adult Dosing
* **Mild to Moderate Infections:** 500 mg amoxicillin/125 mg clavulanate every 8 hours OR 875 mg/125 mg every 12 hours.
* **Severe Infections/Respiratory Tract Infections:** 875 mg/125 mg every 12 hours or 2000 mg/125 mg (extended-release) every 12 hours.
* **Maximum daily dose:** Usually capped by the clavulanate component to minimize gastrointestinal toxicity.
## Pediatric Dosing
* **General dosing (based on amoxicillin component):** 20–45 mg/kg/day divided every 8–12 hours.
* **Acute Otitis Media:** 80–90 mg/kg/day divided every 12 hours (use formulation with 7:1 ratio to minimize clavulanate intake).
* *Note: Always verify the concentration of the suspension used, as ratios (e.g., 200 mg/5 mL vs 400 mg/5 mL) vary significantly.*
## Dose Adjustments
* **Renal Impairment:** Reduce dose or increase interval if CrCl < 30 mL/min. Avoid extended-release (ER) tablets in severe renal impairment (CrCl < 30 mL/min).
* **Hepatic Impairment:** Use with caution; monitor liver function.
## Contraindications
* History of serious hypersensitivity (e.g., anaphylaxis) to penicillins.
* History of cholestatic jaundice or hepatic dysfunction associated with previous use of amoxicillin-clavulanate.
## Adverse Effects
* **Gastrointestinal:** Diarrhea (very common due to clavulanate), nausea, vomiting.
* **Hypersensitivity:** Rash (maculopapular to severe anaphylaxis).
* **Hepatobiliary:** Elevated AST/ALT, cholestatic jaundice (more likely in patients >60 or with prolonged therapy).
* **Other:** *Clostridioides difficile*-associated diarrhea, mucocutaneous candidiasis.
## Key Drug Interactions
* **Methotrexate:** May decrease renal clearance, increasing risk of toxicity.
* **Warfarin:** May increase INR; monitor closely during and after therapy.
* **Oral Contraceptives:** Potential for reduced efficacy (though evidence is debated, backup contraception is often recommended during therapy).
* **Probenecid:** Increases and prolongs amoxicillin serum levels.
## Monitoring
* Monitor for signs of hypersensitivity, especially with the first dose.
* Assess bowel habits for signs of *C. difficile*.
* In prolonged therapy (>14 days), monitor LFTs and CBC.
* Renal function (BUN/SCr) in patients at risk of accumulation.
## Clinical Pearls
* **GI Tolerance:** Administer at the start of a meal to reduce gastrointestinal side effects.
* **Formulation Warning:** 250 mg tablets and 250 mg suspensions contain the same amount of clavulanate; two 250 mg tablets are NOT interchangeable with one 500 mg tablet due to excessive clavulanate delivery.
* **Dosing Ratio:** Always calculate the dose based on the amoxicillin component; verify that the patient is receiving the correct ratio of amoxicillin to clavulanate for the intended indication.
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**Educational Disclaimer:** This information is intended for educational purposes for healthcare professionals. Clinical practice guidelines and local susceptibility profiles vary; always consult the current institutional formulary, official product labeling, and local antibiograms before prescribing.
