Amoxiclav

# Amoxiclav ## Overview - **Classification**: Penicillin antibiotic + Beta-lactamase inhibitor. - **Mechanism**: Amoxicillin inhibits bacterial cell wall synthesis. Clavulanate protects amoxicillin from beta-lactamase degradation. ## Primary Indications 1. **Respiratory Tract Infections** - Acute otitis media, sinusitis, community-acquired pneumonia. 2. **Skin and Soft Tissue Infections** - Cellulitis, animal/human bite wounds. 3. **Urinary Tract Infections** - Especially complicated UTIs. 4. **Bone and Joint Infections**. ## Adult Dosing ### Standard Dosing **Mild-to-Moderate Infections (e.g., mild Sinusitis, Otitis Media)** - **Dose**: **500 mg/125 mg** (Amoxicillin/Clavulanate) - **Frequency**: Every **8 hours** (TID) - **Route**: Oral - **Duration**: 7-10 days **Severe Infections (e.g., severe CAP, severe sinusitis, complicated UTI)** - **Dose**: **875 mg/125 mg** (Amoxicillin/Clavulanate) - **Frequency**: Every **12 hours** (BID) - **Route**: Oral - **Duration**: 7-14 days **IV Dosing (e.g., severe infections, osteomyelitis)** - **Dose**: **1000 mg/200 mg** (Amoxicillin/Clavulanate) - **Frequency**: Every **8 hours** - **Route**: Intravenous (IV) - **Maximum Dose**: Up to **1200 mg/200 mg** every 8 hours for very severe infections. ### Dose Adjustments - **Renal Impairment**: - CrCl > 30 mL/min: No adjustment. - CrCl 10-30 mL/min: Oral **500 mg/125 mg** q12h; IV **1000 mg/200 mg** q12h. - CrCl < 10 mL/min: Oral **500 mg/125 mg** q24h; IV **1000 mg/200 mg** q24h. - Hemodialysis: Administer dose after dialysis. - **Hepatic Impairment**: Use with caution. Monitor liver function regularly. - **Elderly Patients**: Adjust dose based on renal function. ## Pediatric Dosing (Dosing based on amoxicillin component, specific formulations vary) ### Neonates (0-28 days) - **Dose**: Not routinely recommended. Limited data, consult ID specialist. - **Special Notes**: Immature renal function can lead to higher clavulanate levels. ### Infants (1-12 months) - **Dose**: **30-45 mg/kg/day** (amoxicillin) - **Frequency**: Divided **q12h** or **q8h** (depending on ratio). - **Maximum**: **1000 mg/day** amoxicillin. - **Special Note**: For severe/recurrent otitis media, consider **90 mg/kg/day** divided **q12h**. Max **1750 mg/day**. ### Children (1-12 years) - **Dose**: **25-45 mg/kg/day** (amoxicillin) for mild/moderate infections. - **Frequency**: Divided **q12h** or **q8h**. - **Maximum**: **875 mg** (amoxicillin) per dose. - **Severe infections**: **80-90 mg/kg/day** (amoxicillin) divided **q12h**. Max **1750 mg/day**. ### Adolescents (13-18 years) - **Dose**: Generally follow **adult dosing guidelines**. - **Maximum**: Adult dose. ## Safety Information ### Contraindications - **Absolute**: History of **cholestatic jaundice/hepatic dysfunction** due to amoxicillin/clavulanate. - **Absolute**: History of **severe hypersensitivity reaction** (e.g., anaphylaxis, SJS) to beta-lactams. - **Absolute**: Infectious mononucleosis (high risk of rash). ### Common Adverse Effects - **Very Common (>10%)**: Diarrhea, Nausea, Vomiting. - **Common (1-10%)**: Skin rash, candidiasis (oral/vaginal), dyspepsia. - **Serious but Rare**: - **Clostridium difficile-associated diarrhea (CDAD)**. - **Hepatotoxicity** (cholestatic jaundice, hepatitis). - **Severe skin reactions** (SJS, TEN, DRESS). - **Anaphylaxis**. ### Key Drug Interactions - **Warfarin**: Increased INR, monitor closely. - **Methotrexate**: Increased methotrexate levels, monitor for toxicity. - **Probenecid**: Increases and prolongs amoxicillin blood levels. - **Oral Contraceptives**: May reduce efficacy; advise backup contraception. - **Allopurinol**: Increased risk of skin rash. ## Monitoring & Follow-up - **Before Treatment**: Assess history of allergies. Evaluate renal/hepatic function if impaired. - **During Treatment**: Monitor for allergic reactions, rash, GI upset (especially diarrhea). - **During Treatment**: Monitor LFTs if prolonged treatment or pre-existing hepatic issues. - **Clinical Signs**: Resolution of infection symptoms, absence of new rash, normal bowel function. ## Clinical Pearls - 💡 **Administration**: Take at the **start of a meal** to enhance absorption and minimize GI upset. - 💡 **Formulation**: Oral suspensions must be **refrigerated** after reconstitution and discarded after 10 days. - 💡 **Liver Injury**: Hepatic dysfunction can occur during or up to several weeks **after** discontinuation. - 💡 **Resistance**: Do not use for viral infections. Ensure appropriate bacterial diagnosis. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.