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## Amoxicillin-Clavulanate Potassium (Amox/Clav)
### Overview
Amoxicillin-clavulanate is a combination antibiotic consisting of amoxicillin, a penicillin-class beta-lactam antibiotic, and clavulanate potassium, a beta-lactamase inhibitor. Clavulanate protects amoxicillin from degradation by some bacterial beta-lactamase enzymes, expanding its spectrum of activity.
### Primary Indications
* Bacterial sinusitis
* Acute otitis media
* Bacterial pneumonia
* Skin and soft tissue infections (e.g., animal bites, cellulitis)
* Urinary tract infections
### Adult Dosing
Dosing is based on the amoxicillin component. The clavulanate component is typically dosed at a fixed ratio (e.g., 2:1 or 7:1 amoxicillin:clavulanate).
* **Mild-to-moderate infections:** 500 mg amoxicillin/125 mg clavulanate orally every 12 hours, or 250 mg amoxicillin/125 mg clavulanate orally every 8 hours.
* **Severe infections or lower respiratory tract infections:** 875 mg amoxicillin/125 mg clavulanate orally every 12 hours.
* **Maximum daily dose:** Generally avoid exceeding 4000 mg amoxicillin/1000 mg clavulanate per day.
### Pediatric Dosing
Dosing is based on amoxicillin weight-based recommendations and is typically dosed every 8 or 12 hours. The specific clavulanate formulation (e.g., 50 mg/mL or 125 mg/5 mL suspension) will dictate the volume. Pediatric dosing depends on local protocol and formulation availability.
* **For otitis media, sinusitis, and lower respiratory tract infections:**
* 45 mg/kg/day divided every 12 hours.
* 90 mg/kg/day divided every 8 hours.
* **Maximum daily dose:** Generally avoid exceeding 4000 mg amoxicillin/1000 mg clavulanate per day.
### Dose Adjustments
**Renal Impairment:** Dose adjustment is necessary for adults and pediatrics based on creatinine clearance (CrCl).
* **CrCl > 30 mL/min:** Usual dose.
* **CrCl 10-30 mL/min:**
* Adults: 500 mg amoxicillin/125 mg clavulanate every 12 hours (or equivalent for other strengths).
* Pediatrics: Follow specific guidelines based on weight and CrCl.
* **CrCl < 10 mL/min:**
* Adults: 500 mg amoxicillin/125 mg clavulanate every 24 hours (or equivalent for other strengths).
* Pediatrics: Follow specific guidelines based on weight and CrCl.
* **Hemodialysis:** Administer dose at the end of hemodialysis.
### Contraindications
* Known serious hypersensitivity to amoxicillin, clavulanate, penicillins, or cephalosporins.
* History of jaundice or hepatic dysfunction associated with amoxicillin-clavulanate therapy.
### Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, urticaria.
* **Serious:**
* Hypersensitivity reactions (anaphylaxis).
* Severe cutaneous adverse reactions (SCARs) such as Stevens-Johnson syndrome.
* Clostridioides difficile-associated diarrhea.
* Hepatitis and cholestatic jaundice.
### Key Drug Interactions
* **Probenecid:** May increase amoxicillin serum levels.
* **Warfarin:** May alter INR; monitor closely.
* **Oral contraceptives:** Efficacy may be reduced.
* **Allopurinol:** Increased incidence of rash.
### Monitoring
* **Renal function:** Especially in patients with known renal impairment.
* **Liver function:** Particularly with prolonged therapy or history of liver disease.
* **Signs of hypersensitivity reactions.**
* **Signs of C. difficile infection.**
### Clinical Pearls
* Oral suspensions should be refrigerated and should not be used after the expiration date printed on the label.
* Dosing is critical for efficacy and minimizing resistance. Ensure accurate weight-based dosing in pediatric patients.
* Diarrhea is common and usually mild, but severe or persistent diarrhea should be investigated for C. difficile.
* Use with caution in patients with a history of penicillin allergy.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before making clinical decisions.
