Axoxyclav

# Amoxicillin/Clavulanate ## Overview - **Classification**: Penicillin antibiotic (aminopenicillin) combined with a beta-lactamase inhibitor. - **Mechanism**: Amoxicillin inhibits bacterial cell wall synthesis. Clavulanate irreversibly binds to and inactivates beta-lactamase enzymes, preventing amoxicillin degradation. ## Primary Indications 1. **Acute Bacterial Sinusitis (ABS)** - Caused by susceptible beta-lactamase producing bacteria. 2. **Community-Acquired Pneumonia (CAP)** - For presumed or confirmed susceptible bacterial infections. 3. **Acute Otitis Media (AOM)** - Especially for recurrent or refractory cases due to resistant strains. 4. **Skin and Soft Tissue Infections** - Including animal/human bites, cellulitis, abscesses. 5. **Urinary Tract Infections (UTIs)** - For complicated cases or those unresponsive to first-line agents. ## Adult Dosing ### Standard Dosing **Acute Bacterial Sinusitis, CAP, Skin/Soft Tissue Infections** - **Dose**: **875 mg amoxicillin / 125 mg clavulanate** - **Frequency**: Every **12 hours** - **Route**: Oral - **Duration**: 5-10 days, depending on infection severity. **Severe/Recurrent Acute Otitis Media, More Severe Infections** - **Dose**: **500 mg amoxicillin / 125 mg clavulanate** - **Frequency**: Every **8 hours** - **Route**: Oral - **Maximum dose**: **4000 mg amoxicillin / 500 mg clavulanate** per day. ### Dose Adjustments - **Renal Impairment**: - CrCl > 30 mL/min: No adjustment needed. - CrCl 10-30 mL/min: **500 mg / 125 mg** every **12 hours**. - CrCl < 10 mL/min: **500 mg / 125 mg** every **24 hours**. - Hemodialysis: **500 mg / 125 mg** every **24 hours** plus an additional dose during/after dialysis. - **Hepatic Impairment**: Use with caution; monitor liver function. No specific dose adjustment. - **Elderly Patients**: Generally dose as per adult guidelines, with careful consideration for renal function. ## Pediatric Dosing (based on amoxicillin component) ### Neonates (0-28 days) - Generally **avoided** due to immature renal function and potential for cholestasis. - If clinically necessary, use extremely cautiously. ### Infants (1-12 months) **Acute Otitis Media, Sinusitis (high dose for resistant strains)** - **Dose**: **90 mg/kg/day** (of amoxicillin component) - **Frequency**: Divided every **12 hours** (e.g., Augmentin ES 600 mg/42.9 mg per 5 mL formulation). - **Maximum**: **600 mg** amoxicillin per dose. ### Children (1-12 years) **Acute Otitis Media, Sinusitis (high dose for resistant strains)** - **Dose**: **90 mg/kg/day** (of amoxicillin component) - **Frequency**: Divided every **12 hours** (e.g., Augmentin ES 600 mg/42.9 mg per 5 mL formulation). - **Maximum**: **2000 mg** amoxicillin / **125 mg** clavulanate per day (total daily). - **Special Notes**: Ensure appropriate formulation (e.g., **600 mg/42.9 mg** per 5 mL suspension) for higher doses to limit clavulanate intake. **Less Severe Infections (e.g., Skin/Soft Tissue)** - **Dose**: **25-45 mg/kg/day** (of amoxicillin component) - **Frequency**: Divided every **12 hours** or every **8 hours**. - **Maximum**: **1000 mg** amoxicillin / **125 mg** clavulanate per dose. ### Adolescents (13-18 years) - **Dose**: Generally follow **adult dosing** recommendations. - **Maximum**: **4000 mg amoxicillin / 500 mg clavulanate** per day. ## Safety Information ### Contraindications - **Absolute**: History of severe hypersensitivity reaction (e.g., anaphylaxis) to any penicillin. - **Absolute**: History of cholestatic jaundice or hepatic dysfunction associated with Amoxicillin/Clavulanate. - **Absolute**: History of severe skin reactions (e.g., Stevens-Johnson Syndrome) to penicillins. ### Common Adverse Effects - **Very Common (>10%)**: Diarrhea. - **Common (1-10%)**: Nausea, vomiting, rash, candidiasis (oral/vaginal). - **Serious but Rare**: Pseudomembranous colitis (C. difficile-associated), hepatotoxicity, severe skin reactions (SJS, TEN), angioedema, anaphylaxis. ### Key Drug Interactions - **Warfarin**: May prolong prothrombin time (INR); monitor INR closely. - **Methotrexate**: Increased methotrexate levels/toxicity; monitor for signs of toxicity. - **Allopurinol**: Increased risk of skin rash; avoid concomitant use if possible. - **Oral Contraceptives**: May decrease efficacy (advise backup contraception). - **Probenecid**: Delays amoxicillin renal excretion, increasing levels (can be used therapeutically). ## Monitoring & Follow-up - **Before Treatment**: Assess for penicillin allergy history. - **During Treatment**: Monitor for signs of allergic reaction, diarrhea, or rash. For prolonged use or high doses, consider liver/renal function tests. - **Clinical Signs**: Watch for persistent or severe diarrhea (C. diff), yellowing skin/eyes (hepatotoxicity), or widespread rash/mucosal lesions (severe skin reaction). ## Clinical Pearls - 💡 **Take with food**: Reduces GI upset and improves absorption of clavulanate. - 💡 **Complete full course**: Even if symptoms improve, to prevent resistance. - 💡 **Suspension storage**: Refrigerate liquid suspension after reconstitution; discard after 10 days. - 💡 **High dose AOM**: Use the ES formulation (e.g., 600 mg/42.9 mg per 5 mL) to minimize clavulanate exposure. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.