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# Amoxicillin-Clavulanate (Augmentin)
## Overview
Amoxicillin-clavulanate is a combination penicillin-class antibiotic (amoxicillin) and a beta-lactamase inhibitor (clavulanate potassium). The addition of clavulanate preserves the antimicrobial activity of amoxicillin against beta-lactamase-producing bacteria.
## Primary Indications
* Acute bacterial rhinosinusitis
* Community-acquired pneumonia
* Skin and soft tissue infections (e.g., animal/human bites)
* Otitis media
* Urinary tract infections (indicated for specific resistance patterns)
## Adult Dosing
* **Standard:** 500 mg/125 mg orally every 8 hours OR 875 mg/125 mg orally every 12 hours.
* **Severe/Respiratory:** 875 mg/125 mg orally every 12 hours OR 2000 mg/125 mg (extended-release) every 12 hours.
* **Duration:** Typically 5–10 days based on infection site and clinical response.
## Pediatric Dosing
* **Weight-based:** 20 to 45 mg/kg/day (based on amoxicillin component) divided every 8–12 hours.
* **Recurrent/Resistant Otitis Media:** 90 mg/kg/day divided every 12 hours.
* **Important:** Use the 600 mg/5 mL (ES) suspension to achieve the 90 mg/kg/day dose; others contain too much clavulanate relative to amoxicillin.
## Dose Adjustments
* **Renal Impairment:** Reduce frequency for CrCl < 30 mL/min. Avoid the 875 mg tablet if CrCl < 30 mL/min.
* **Hepatic Impairment:** Use with caution; monitor hepatic function.
## Contraindications
* History of serious hypersensitivity (e.g., anaphylaxis, Stevens-Johnson syndrome) to penicillins.
* History of cholestatic jaundice or hepatic dysfunction associated with previous use of amoxicillin-clavulanate.
## Adverse Effects
* **Common:** Diarrhea (frequently associated with clavulanate), nausea, vomiting, rash, abdominal pain.
* **Serious:** Clostridioides difficile-associated diarrhea, hepatotoxicity (cholestatic jaundice), hypersensitivity reactions.
## Key Drug Interactions
* **Methotrexate:** May decrease renal clearance, increasing risk of toxicity.
* **Warfarin:** May increase INR/bleeding risk; monitor prothrombin time/INR.
* **Probenecid:** Increases/prolongs amoxicillin serum levels.
* **Oral Contraceptives:** Potential for reduced efficacy (though clinical data is mixed).
## Monitoring
* Monitor for signs of anaphylaxis during the first dose.
* Assess for resolution of infection symptoms.
* Monitor liver function tests if prolonged therapy is required.
* Observe for diarrhea; discontinue if severe or suspected *C. difficile*.
## Clinical Pearls
* **Take with food:** Administer at the start of a meal to reduce gastrointestinal side effects and improve absorption.
* **Clavulanate Ratio:** Not all formulations are interchangeable. The 250 mg and 500 mg tablets contain 125 mg of clavulanate; two 250 mg tablets are not equivalent to one 500 mg tablet.
* **Suspension:** Must be refrigerated and discarded after 10 days.
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*Disclaimer: This information is for educational purposes and does not replace professional medical judgment. Always verify current dosing guidelines, contraindications, and drug-drug interactions through official prescribing information or institution-specific protocols before prescribing or administering medication.*
