# Clavam ## Overview - **Classification**: Beta-lactam antibiotic, Penicillin class, combined with a 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 Otitis Media (AOM)** - Especially for resistant strains or treatment failures. 2. **Acute Bacterial Sinusitis** - For suspected bacterial etiology. 3. **Lower Respiratory Tract Infections** - Community-acquired pneumonia (CAP), acute bacterial exacerbations of chronic bronchitis (ABECB). 4. **Skin and Skin Structure Infections** - Uncomplicated, animal/human bite wounds. 5. **Urinary Tract Infections (UTI)** - Uncomplicated UTIs caused by susceptible organisms. ## Adult Dosing ### Standard Dosing **Acute Bacterial Sinusitis, CAP, Animal/Human Bite Wounds** - **Dose**: **875 mg amoxicillin/** **125 mg clavulanate** - **Frequency**: Every **12 hours** - **Route**: Oral - **Duration**: **10-14 days** (sinusitis, CAP), **3-5 days** (bite wounds) **Less Severe Infections (e.g., Mild AOM, Skin/Soft Tissue)** - **Dose**: **500 mg amoxicillin/** **125 mg clavulanate** - **Frequency**: Every **8 hours** - **Route**: Oral - **Duration**: **7-10 days** ### Dose Adjustments - **Renal Impairment**: - **CrCl >30 mL/min**: No adjustment. - **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 given during and at the end of dialysis. - **Hepatic Impairment**: Use with caution. Monitor liver function. No specific dose recommendations. - **Elderly Patients**: Adjust dose based on renal function. Generally well tolerated. ## Pediatric Dosing *Note: Dosing depends on the amoxicillin component. Choose appropriate suspension strength.* ### Neonates (0-28 days) - **Dose**: Not generally recommended due to immature renal function and potential for unconjugated hyperbilirubinemia with clavulanate. - **Frequency**: Not established. - **Special Notes**: Consider alternative agents. If unavoidable, use extreme caution and dose conservatively. ### Infants (1-12 months) **Acute Otitis Media (AOM), Sinusitis, Lower Respiratory Tract Infections (High Dose)** - **Dose**: **45 mg/kg/day** (amoxicillin component) - **Frequency**: Divided every **12 hours** - **Maximum**: No more than **1000 mg/day** (amoxicillin) - **Formulation**: Oral suspension (e.g., 200 mg/5 mL or 400 mg/5 mL) ### Children (1-12 years) **Acute Otitis Media (AOM), Sinusitis, Lower Respiratory Tract Infections (High Dose)** - **Dose**: **45 mg/kg/day** (amoxicillin component) - **Frequency**: Divided every **12 hours** - **Maximum**: **1750 mg/day** (amoxicillin) - **Formulation**: Oral suspension or chewable tablets **Less Severe Infections (e.g., Skin/Soft Tissue)** - **Dose**: **20-25 mg/kg/day** (amoxicillin component) - **Frequency**: Divided every **8 hours** - **Maximum**: **1500 mg/day** (amoxicillin) ### Adolescents (13-18 years) - **Dose**: Generally follows **adult dosing** guidelines. - **Maximum**: **1750 mg/day** (amoxicillin) or **3500 mg/day** for extended-release formulations. ## Safety Information ### Contraindications - **Absolute**: History of severe hypersensitivity reaction to amoxicillin or any penicillin (e.g., anaphylaxis, SJS). - **Absolute**: History of cholestatic jaundice/hepatic dysfunction associated with amoxicillin/clavulanate use. - **Relative**: Mononucleosis (increased risk of rash). ### Common Adverse Effects - **Very Common (>10%)**: Diarrhea. - **Common (1-10%)**: Nausea, vomiting, abdominal pain, skin rash, vaginitis. - **Serious but Rare**: Cholestatic jaundice, hepatitis, severe skin reactions (SJS, TEN), C. difficile-associated diarrhea (CDAD), anaphylaxis, angioedema. ### Key Drug Interactions - **Warfarin**: May prolong prothrombin time (INR); monitor INR closely. - **Methotrexate**: May decrease methotrexate clearance, increasing toxicity; monitor. - **Allopurinol**: Increased incidence of rash, especially in hyperuricemic patients. - **Oral Contraceptives**: May reduce efficacy; advise backup contraception. - **Probenecid**: Increases and prolongs amoxicillin blood levels; generally not significant clinically. ## Monitoring & Follow-up - **Before Treatment**: Assess drug allergies, liver/kidney function (if baseline concerns). - **During Treatment**: Monitor for signs of hypersensitivity, severe diarrhea, or hepatotoxicity. - **Clinical Signs**: Watch for rash, persistent diarrhea, jaundice, dark urine, or unusual bruising/bleeding. ## Clinical Pearls - 💡 **Administration**: Take at the start of a meal to reduce GI upset and enhance absorption of clavulanate. - 💡 **Formulations**: Always confirm the **ratio** (e.g., 7:1, 16:1) as clavulanate component can vary, affecting total clavulanate intake. - 💡 **Storage**: Oral suspensions must be **refrigerated** and discarded after **10 days**. - 💡 **Rash**: A non-allergic rash can occur, especially in patients with mononucleosis. - 💡 **CDAD Risk**: Counsel patients on symptoms of C. difficile infection (severe, persistent diarrhea). > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.