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## Amoxicillin-Clavulanate Potassium (Augmentin)
### Overview
Amoxicillin-clavulanate potassium is a combination penicillin-type antibiotic and a beta-lactamase inhibitor. It is active against a broader spectrum of bacteria than amoxicillin alone.
### Primary Indications
* Bacterial sinusitis
* Acute otitis media
* Lower respiratory tract infections (e.g., chronic bronchitis exacerbations, community-acquired pneumonia)
* Urinary tract infections (e.g., cystitis, pyelonephritis)
* Skin and skin structure infections (e.g., cellulitis, animal bites, perioral abscesses)
### Adult Dosing
Dosing is typically based on the amoxicillin component.
* **Sinusitis, Otitis Media, Lower Respiratory Tract Infections, Skin Infections:** 500 mg amoxicillin/125 mg clavulanate orally every 12 hours, or 875 mg amoxicillin/125 mg clavulanate orally every 24 hours.
* **Urinary Tract Infections:** 875 mg amoxicillin/125 mg clavulanate orally every 24 hours.
* **Severe Infections:** Higher doses may be used per local protocol.
### Pediatric Dosing
Dosing is based on amoxicillin weight-based recommendations and the ratio of amoxicillin to clavulanate. Available as a powder for oral suspension.
* **Otitis Media, Sinusitis, Lower Respiratory Tract Infections:**
* **90 mg/kg/day amoxicillin divided into two doses:** administered every 12 hours, up to a maximum amoxicillin dose of 4000 mg/day.
* **60 mg/kg/day amoxicillin divided into three doses:** administered every 8 hours, up to a maximum amoxicillin dose of 4000 mg/day.
* *(Exact mg/kg/day clavulanate dose depends on product concentration)*.
* **Children > 40 kg:** Use adult dosing.
* **Infants < 3 months:** Limited data; consult local guidelines.
### Dose Adjustments
* **Renal Impairment:** Dose adjustments are necessary for both adults and pediatrics with creatinine clearance (CrCl) < 30 mL/min.
* **CrCl 10-30 mL/min:** Reduce dose frequency. For oral suspension, reduce total daily dose by 50% and administer every 12-24 hours depending on indication and severity. For tablets, consult product labeling for specific tablet strengths and dosing intervals.
* **CrCl < 10 mL/min:** Reduce dose frequency. For oral suspension, reduce total daily dose by 75% and administer every 24 hours. For tablets, consult product labeling.
* **Hemodialysis:** Administer dose after dialysis. Supplement dose during and at the end of dialysis.
### Contraindications
* Known serious hypersensitivity to amoxicillin, clavulanate, penicillins, or cephalosporins.
* History of cholestatic jaundice or hepatic dysfunction associated with amoxicillin-clavulanate.
### Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, urticaria, vaginal candidiasis.
* **Serious:** Severe allergic reactions (anaphylaxis), Stevens-Johnson syndrome, toxic epidermal necrolysis, C. difficile-associated diarrhea, hepatotoxicity (especially with prolonged use or in older adults), seizures (rare, with high doses or renal impairment).
### Key Drug Interactions
* **Probenecid:** May increase amoxicillin-clavulanate serum levels.
* **Oral Contraceptives:** May decrease efficacy. Advise patients to use alternative or additional non-hormonal methods of contraception.
* **Warfarin:** May increase INR. Monitor INR closely.
* **Allopurinol:** Increased risk of rash.
### Monitoring
* Assess for signs and symptoms of hypersensitivity reactions.
* Monitor for diarrhea; rule out C. difficile-associated diarrhea.
* Monitor liver function tests with prolonged therapy or if risk factors are present.
* For patients on warfarin, monitor INR.
### Clinical Pearls
* Administer with or without food; however, taking with food may reduce gastrointestinal upset.
* Ensure adequate hydration.
* Complete the full course of therapy as prescribed, even if symptoms improve.
* The oral suspension requires refrigeration after reconstitution and should be used within 10 days.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the current prescribing information and institutional guidelines before making therapeutic decisions.*
