Amoxiclavulanate

# Amoxiclavulanate ## Overview - **Classification**: Beta-lactam antibiotic, Penicillin class + Beta-lactamase inhibitor - **Mechanism**: Amoxicillin inhibits bacterial cell wall synthesis. Clavulanate irreversibly binds to and inactivates beta-lactamase enzymes, protecting amoxicillin from degradation. ## Primary Indications 1. **Acute Bacterial Sinusitis** - Caused by susceptible beta-lactamase producing bacteria. 2. **Acute Otitis Media** - Especially for recurrent or resistant cases. 3. **Lower Respiratory Tract Infections** - Including community-acquired pneumonia. 4. **Skin and Soft Tissue Infections** - Such as animal/human bites, impetigo, cellulitis. 5. **Urinary Tract Infections** - When susceptible beta-lactamase producing pathogens are identified. ## Adult Dosing ### Standard Dosing **Acute Bacterial Sinusitis, AOM, Lower Respiratory Tract, Skin/Soft Tissue Infections** - **Dose**: **875 mg/125 mg** (amoxicillin/clavulanate) or **500 mg/125 mg** - **Frequency**: **Twice daily (BID)** or **Three times daily (TID)** respectively - **Route**: Oral - **Duration**: 7-10 days (up to 14 days for severe infections) - **Special Notes**: Take with food to reduce GI upset. **Severe or Recurrent Infections (e.g., AOM, CAP)** - **Dose**: **875 mg/125 mg** (amoxicillin/clavulanate) - **Frequency**: **Twice daily (BID)** - **Route**: Oral - **Duration**: 7-10 days ### Dose Adjustments - **Renal Impairment**: - **CrCl >30 mL/min**: No dose 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**, with an additional dose during/after dialysis. - **Hepatic Impairment**: Use with caution; monitor liver function. Discontinue if hepatic dysfunction occurs. - **Elderly Patients**: Adjust dose based on renal function; no specific adjustment solely for age. ## Pediatric Dosing **Note**: Doses are based on the **amoxicillin component**. Use appropriate oral suspension concentrations (e.g., 200 mg/28.5 mg per 5 mL or 400 mg/57 mg per 5 mL, which are 7:1 ratios). The clavulanate component should not exceed 10 mg/kg/day or adult maximums. ### Neonates (0-28 days) - **General**: **Not recommended** due to immature renal function and potential for necrotizing enterocolitis. - **Special Notes**: Avoid use unless absolutely critical and under specialist guidance. ### Infants (1-12 months) - **Acute Otitis Media, Sinusitis**: - **Dose**: **45 mg/kg/day** (of amoxicillin component) - **Frequency**: Divided every **12 hours (BID)** - **Maximum**: **1000 mg** amoxicillin per day. - **Special Notes**: Use 7:1 ratio suspension (e.g., 200/28.5 mg/5mL or 400/57 mg/5mL). ### Children (1-12 years) - **Mild-to-Moderate Infections (e.g., lower respiratory, skin/soft tissue)**: - **Dose**: **20-25 mg/kg/day** (of amoxicillin component) - **Frequency**: Divided every **8-12 hours (TID or BID)** - **Maximum**: **500 mg** amoxicillin per dose. - **Severe Infections (e.g., AOM, Sinusitis, CAP)**: - **Dose**: **40-45 mg/kg/day** (of amoxicillin component) - **Frequency**: Divided every **12 hours (BID)** - **Maximum**: **1000 mg** amoxicillin per day. - **Special Notes**: Use 7:1 ratio suspension for high-dose regimens. ### Adolescents (13-18 years) - **Dose**: Follow **adult dosing guidelines**. - **Maximum**: **875 mg/125 mg** BID or **500 mg/125 mg** TID. ## Safety Information ### Contraindications - **Absolute**: History of severe hypersensitivity to penicillin (e.g., anaphylaxis). - **Absolute**: History of amoxiclavulanate-associated cholestatic jaundice/hepatic dysfunction. - **Absolute**: Infectious mononucleosis (high risk of rash). ### Common Adverse Effects - **Very Common (>10%)**: Diarrhea, Nausea, Vomiting. - **Common (1-10%)**: Rash, Urticaria, Vaginitis, Headache. - **Serious but Rare**: Anaphylaxis, Stevens-Johnson syndrome, Cholestatic jaundice, Hepatitis, Clostridium difficile-associated diarrhea (CDAD), Seizures. ### Key Drug Interactions - **Warfarin**: May increase INR; monitor INR closely. - **Methotrexate**: Increases methotrexate levels, potentially enhancing toxicity; monitor for adverse effects. - **Allopurinol**: Increases incidence of rash with amoxicillin. - **Oral Contraceptives**: May decrease efficacy; advise alternative contraception. ## Monitoring & Follow-up - **Before Treatment**: Assess penicillin allergy history. - **During Treatment**: - Monitor for signs of allergic reaction (rash, itching, dyspnea). - Observe for severe diarrhea (may indicate CDAD). - For prolonged therapy or high doses, consider baseline and periodic liver function tests (LFTs) and renal function tests. - **Clinical Signs**: Resolution of infection symptoms, absence of fever. ## Clinical Pearls - 💡 **Take with food**: To minimize gastrointestinal side effects (nausea, diarrhea). - 💡 **Complete the full course**: Even if symptoms improve, to prevent resistance and relapse. - 💡 **Non-allergic rash**: A non-allergic, generalized maculopapular rash can occur, especially with mononucleosis. Differentiate from true allergy. - 💡 **Suspension storage**: Refrigerate oral suspensions; discard after 10 days. - 💡 **Clavulanate component**: Pay close attention to the clavulanate amount in pediatric formulations to prevent exceeding max daily dose. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.