Amoxy-Clavulinic

# Amoxy-Clavulinic (Amoxicillin/Clavulanate) ## Overview - **Classification**: Beta-lactam antibiotic, Penicillin class, combination with beta-lactamase inhibitor - **Mechanism**: Amoxicillin inhibits bacterial cell wall synthesis. Clavulanate irreversibly inactivates beta-lactamase enzymes, preventing amoxicillin degradation. ## Primary Indications 1. **Acute Otitis Media (AOM)** - Especially for resistant *S. pneumoniae* 2. **Acute Bacterial Sinusitis** - For suspected bacterial causes 3. **Community-Acquired Pneumonia (CAP)** - For susceptible organisms 4. **Skin and Skin Structure Infections** - Due to beta-lactamase producing *Staphylococcus aureus* 5. **Lower Urinary Tract Infections** - When susceptible organisms are confirmed or suspected ## Adult Dosing ### Standard Dosing **Acute Otitis Media, Sinusitis, CAP, Skin/Skin Structure Infections** - **Dose**: **875 mg** amoxicillin / **125 mg** clavulanate - **Frequency**: Every **12 hours** (BID) - **Route**: Oral - **Duration**: **10-14 days** for AOM/sinusitis, **5-7 days** for CAP, **7-14 days** for skin infections. **Lower Urinary Tract Infections** - **Dose**: **500 mg** amoxicillin / **125 mg** clavulanate - **Frequency**: Every **8 hours** (TID) - **Route**: Oral - **Duration**: **3-7 days** ### 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**. (Use 250/125 or 500/125 tablets). - **Hemodialysis**: **500 mg/125 mg** every **24 hours**; administer an additional dose during and at end of dialysis. - **Hepatic Impairment**: Use with caution; monitor liver function. Not recommended if history of Amox/Clav-associated hepatic dysfunction. - **Elderly Patients**: Adjust dose based on renal function, typically no specific dose adjustment based on age alone. ## Pediatric Dosing (Based on Amoxicillin Component) ### Neonates (0-28 days) - **Not Recommended**: Generally avoided due to potential for necrotizing enterocolitis and immature renal function affecting clavulanate excretion. Consult specialist if use is considered off-label. ### Infants (1-12 months) - **Indication**: Acute Otitis Media, Sinusitis - **Dose (Standard)**: **25 mg/kg/day** (amoxicillin) divided every **12 hours**. - Max: **625 mg/day** (amoxicillin component). - **Dose (High-dose for resistant AOM)**: **90 mg/kg/day** (amoxicillin) divided every **12 hours**. - Max: **1000 mg/day** (amoxicillin component). - **Route**: Oral suspension (e.g., **200 mg/28.5 mg/5mL** or **400 mg/57 mg/5mL**). - **Special Notes**: Use suspensions for accurate dosing. Ensure clavulanate dose does not exceed **12.5 mg/kg/day**. ### Children (1-12 years) - **Indication**: Acute Otitis Media, Sinusitis, CAP, Skin/Skin Structure Infections - **Dose (Standard)**: **25 mg/kg/day** (amoxicillin) divided every **12 hours**. - Max: **625 mg/day** (amoxicillin component). - **Dose (High-dose for resistant AOM, Sinusitis)**: **90 mg/kg/day** (amoxicillin) divided every **12 hours**. - Max: **1000 mg/day** (amoxicillin component). - **Route**: Oral suspension or chewable tablets (e.g., **400 mg/57 mg/5mL**, **600 mg/42.9 mg/5mL** for high dose). - **Maximum (Amoxicillin)**: Do not exceed adult doses (e.g., **2000 mg/day** for standard high-dose, **2625 mg/day** for TID regimens). - **Maximum (Clavulanate)**: Do not exceed **12.5 mg/kg/day**; limit to **~125 mg per dose** for standard formulations to prevent GI upset. The 600 mg/42.9 mg/5 mL formulation allows higher amoxicillin while keeping clavulanate ratio safe. ### Adolescents (13-18 years) - **Dose**: Use **adult dosing regimens**. - **Maximum**: Follow adult maximum doses. ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to penicillins or clavulanate. - **Absolute**: History of amoxicillin-clavulanate associated cholestatic jaundice/hepatic dysfunction. - **Absolute**: History of severe immediate hypersensitivity reaction to any beta-lactam. ### Common Adverse Effects - **Very Common (>10%)**: Diarrhea, nausea - **Common (1-10%)**: Vomiting, rash, candidiasis (vaginal, oral), abdominal pain, headache - **Serious but Rare**: Anaphylaxis, Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), hepatic dysfunction (cholestatic jaundice), *Clostridioides difficile*-associated diarrhea (CDAD), severe allergic reactions (DRESS syndrome). ### Key Drug Interactions - **Warfarin**: Increased INR, monitor closely, adjust warfarin dose. - **Methotrexate**: Increased methotrexate toxicity, monitor for adverse effects. - **Allopurinol**: Increased risk of rash. - **Oral Contraceptives**: Theoretical reduction in efficacy, though clinical significance is debated. ## Monitoring & Follow-up - **Before Treatment**: Assess for penicillin allergy. - **During Treatment**: - Monitor for signs of allergic reaction (rash, dyspnea). - Watch for GI upset (diarrhea, nausea). - Monitor liver function tests (ALT, AST, bilirubin) in patients with pre-existing hepatic impairment or prolonged therapy. - Monitor renal function in patients with renal impairment. - **Clinical Signs**: Resolution of infection symptoms, absence of severe diarrhea or skin rash. ## Clinical Pearls - 💡 **Administration**: Administer at the **start of a meal** to enhance absorption and minimize GI intolerance. - 💡 **Shake Suspensions**: **Shake oral suspensions well** before each dose for accurate dosing. - 💡 **Completion**: Advise patients to **complete the full course** of therapy, even if symptoms improve. - 💡 **Allergy**: Always confirm penicillin allergy status and type of reaction (true allergy vs. GI upset). - 💡 **Formulations**: The **600 mg/42.9 mg/5 mL** suspension is specifically designed for high-dose amoxicillin with a lower clavulanate ratio, ideal for resistant AOM. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.