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# Amoxicillin-Clavulanate (Augmentin)
## Overview
A combination antibiotic consisting of amoxicillin (a beta-lactam) and clavulanate potassium (a beta-lactamase inhibitor). The addition of clavulanate expands the spectrum of activity to include beta-lactamase-producing organisms (e.g., *Staphylococcus aureus*, *H. influenzae*, *M. catarrhalis*, and some *Bacteroides*).
## Primary Indications
Acute bacterial rhinosinusitis, community-acquired pneumonia, animal/human bites, skin and soft tissue infections, and urinary tract infections.
## Adult Dosing
* **Standard dose:** 500 mg/125 mg orally every 8 hours or 875 mg/125 mg orally every 12 hours.
* **Extended-release (Augmentin XR):** 2000 mg/125 mg orally every 12 hours (only for refractory/sinusitis).
* **Maximum:** 2000 mg amoxicillin component per dose.
## Pediatric Dosing
Based on the amoxicillin component.
* **Mild to moderate infection:** 25 mg/kg/day to 45 mg/kg/day in divided doses every 12 hours.
* **Severe infection/Otitis media/Sinusitis:** 80–90 mg/kg/day in divided doses every 12 hours.
* **Note:** Use the lowest clavulanate ratio possible to prevent diarrhea. Generally, 600 mg/5 mL (ES) or 200/400 mg formulations are preferred to limit excessive clavulanate intake.
## Dose Adjustments
* **Renal Impairment:** Reduce dose or increase interval if CrCl < 30 mL/min. Do not use the 875 mg tablet in patients with CrCl < 30 mL/min.
* **Hepatic Impairment:** Use with caution; monitor liver function.
## Contraindications
* History of serious hypersensitivity (e.g., anaphylaxis, DRESS) to penicillins.
* History of cholestatic jaundice or hepatic dysfunction associated with previous use of amoxicillin-clavulanate.
## Adverse Effects
* **Common:** Diarrhea (frequently clavulanate-related), nausea, vomiting, abdominal pain, rashes.
* **Rare but serious:** *C. diff*-associated diarrhea, hepatotoxicity (cholestatic jaundice), anaphylaxis, seizures (at very high doses in renal failure).
## Key Drug Interactions
* **Methotrexate:** May decrease renal clearance, increasing methotrexate toxicity risk.
* **Warfarin:** May increase INR/bleeding risk due to alteration of gut flora (vitamin K synthesis).
* **Probenecid:** Increases amoxicillin serum concentrations by decreasing renal tubular secretion.
## Monitoring
* Monitor renal function (CrCl) prior to and during therapy.
* Monitor LFTs if signs of hepatic dysfunction occur.
* Monitor for signs of hypersensitivity or severe watery/bloody diarrhea (*C. diff*).
## Clinical Pearls
* **Diarrhea Management:** To minimize diarrhea, administer at the *start* of a meal.
* **Formulation Warning:** 250 mg tablets and 500 mg tablets do not contain the same amount of clavulanate; they are not interchangeable on a mg-per-mg basis.
* **Allergy:** Cross-reactivity with cephalosporins is low but exists; exercise caution in patients with history of IgE-mediated penicillin reactions.
* **Dosing protocol:** Always verify specific local antibiogram-directed dosing protocols, as resistance patterns (specifically for *S. pneumoniae*) vary by region.
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**Educational Disclaimer:** This information is for educational purposes only. Always verify drug selection, dosing, and contraindications against current clinical guidelines, institutional protocols, and official product labeling (e.g., DailyMed or package inserts) before prescribing or administering medication.
