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# Amoxicillin-Clavulanate (Augmentin)
## 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
Common indications include acute bacterial rhinosinusitis, community-acquired pneumonia, otitis media, animal/human bites, and skin/soft tissue infections.
## Adult Dosing
Standard dosing is based on the amoxicillin component.
* **Mild to Moderate Infections:** 500 mg orally every 8 hours or 875 mg orally every 12 hours.
* **Severe Infections/Respiratory Tract Infections:** 875 mg orally every 8-12 hours (using the 2000 mg extended-release formulation is an option for specific indications like refractory sinusitis).
* **Maximum:** Do not exceed 875 mg of amoxicillin per dose (unless using specific extended-release formulations).
## Pediatric Dosing
* **General Dosing (≤ 40 kg):** 20 to 45 mg/kg/day (based on amoxicillin component) divided every 8-12 hours.
* **Otitis Media/Severe Infections:** 80 to 90 mg/kg/day divided every 12 hours.
* **Note:** Use the 7:1 ratio (e.g., 600 mg/5 mL suspension) for higher doses to avoid excessive clavulanate intake, which can cause diarrhea.
## Dose Adjustments
* **Renal Impairment:** Adjustments required for CrCl < 30 mL/min. Do not use the 875 mg tablet in patients with severe renal impairment (CrCl < 30 mL/min) as these formulations cannot be dose-adjusted appropriately.
* **Hepatic Impairment:** Use with caution; monitor hepatic function.
## Contraindications
* History of serious hypersensitivity (anaphylaxis) to any penicillin.
* History of cholestatic jaundice or hepatic dysfunction associated with previous use of amoxicillin-clavulanate.
## Adverse Effects
* **Gastrointestinal:** Diarrhea (very common), nausea, vomiting, abdominal pain.
* **Dermatologic:** Rash (maculopapular), urticaria.
* **Other:** Candidiasis (oral or vaginal), increased liver enzymes (ALT/AST).
## Key Drug Interactions
* **Warfarin:** May increase INR/risk of bleeding; monitor closely.
* **Methotrexate:** May decrease renal excretion of methotrexate, increasing risk of toxicity.
* **Oral Contraceptives:** May reduce efficacy; consider barrier methods during therapy.
* **Probenecid:** Increases and prolongs amoxicillin plasma levels.
## Monitoring
* Monitor for signs of hypersensitivity reaction (rash, wheezing).
* Monitor LFTs during prolonged therapy.
* Assess stool frequency/consistency if diarrhea develops (risk of *C. difficile*).
## Clinical Pearls
* **Formulation Warning:** Different strengths of amoxicillin-clavulanate are not interchangeable due to the clavulanic acid component. Always specify the formulation (e.g., 875/125 mg).
* **GI Tolerance:** Take with food to minimize GI upset.
* **Resistance:** Use judiciously to prevent the development of resistant bacteria.
* **Penicillin Allergy:** Do not use if there is a history of IgE-mediated (anaphylactic) reaction to penicillin.
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*Disclaimer: This information is for educational purposes only. Clinical practice guidelines and local resistance patterns vary significantly. Always verify specific dosing, safety precautions, and current prescribing information via institutional protocols or official drug monographs (e.g., Lexicomp, UpToDate) before prescribing or administering medication.*
