Meronem

# Meronem ## Overview - **Classification**: Carbapenem antibiotic - **Mechanism**: Inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to bacterial cell lysis. Broad spectrum. ## Primary Indications 1. **Complicated Skin & Soft Tissue Infections (cSSTI)** - Infections requiring IV therapy. 2. **Complicated Intra-abdominal Infections (cIAI)** - Including appendicitis, peritonitis. 3. **Bacterial Meningitis** - For susceptible organisms. 4. **Community/Hospital-acquired Pneumonia** - Including ventilator-associated pneumonia. 5. **Urinary Tract Infections (cUTI)** - Complicated cases. 6. **Febrile Neutropenia** - As empiric therapy for suspected bacterial infection. ## Adult Dosing ### Standard Dosing **Most Infections (e.g., cSSTI, cIAI, Pneumonia, cUTI)** - **Dose**: **1 g** - **Frequency**: Every **8 hours** - **Route**: IV infusion over 15-30 minutes or IV bolus over 3-5 minutes - **Duration**: Varies by infection, typically 5-14 days. **Severe/Specific Infections (e.g., Meningitis, Febrile Neutropenia, Cystic Fibrosis)** - **Dose**: **2 g** - **Frequency**: Every **8 hours** - **Route**: IV infusion over 15-30 minutes or IV bolus over 3-5 minutes ### Dose Adjustments - **Renal Impairment**: Based on CrCl and standard dose: - **CrCl 26-50 mL/min**: - For 1g q8h indication: **1g q12h**. - For 2g q8h indication: **1g q8h**. - **CrCl 10-25 mL/min**: - For 1g q8h indication: **500mg q12h**. - For 2g q8h indication: **1g q12h**. - **CrCl <10 mL/min**: - For 1g q8h indication: **500mg q24h**. - For 2g q8h indication: **1g q24h**. - **Hemodialysis**: Administer dose immediately after dialysis session. - **Hepatic Impairment**: No dose adjustment generally needed. - **Elderly Patients**: No specific adjustment by age; assess renal function. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose (Weight <2 kg)**: **20 mg/kg** - **Frequency (Weight <2 kg)**: Every **12 hours** - **Dose (Weight ≥2 kg)**: **20 mg/kg** - **Frequency (Weight ≥2 kg)**: Every **8 hours** - **Maximum**: Do not exceed adult single dose (e.g., **2 g**). - **Special Notes**: Consider prolonged infusion in critical illness. ### Infants (1-12 months) - **Dose**: **20 mg/kg** - **Frequency**: Every **8 hours** - **Maximum**: Do not exceed **1 g** per dose for most infections. ### Children (1-12 years) - **General Infections**: **10-20 mg/kg** - **Frequency**: Every **8 hours** - **Meningitis/Cystic Fibrosis**: **40 mg/kg** - **Frequency**: Every **8 hours** - **Maximum**: Do not exceed **2 g** per dose (adult max). ### Adolescents (13-18 years) - **Dose**: Use **adult dosing** based on indication and renal function. - **Maximum**: **2 g** per dose. ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to meropenem or other carbapenem antibiotics. - **Absolute**: Severe hypersensitivity (e.g., anaphylaxis, SJS) to any beta-lactam. ### Common Adverse Effects - **Common (1-10%)**: Diarrhea, Nausea, Vomiting, Headache, Rash, Injection site reactions. - **Serious but Rare**: Seizures, C. difficile-associated diarrhea (CDAD), Anaphylaxis, SJS/TEN, Neutropenia, Liver dysfunction. ### Key Drug Interactions - **Valproic Acid/Sodium Valproate**: Meropenem significantly decreases valproate levels, leading to loss of seizure control. **Concomitant use is contraindicated.** - **Probenecid**: Inhibits renal excretion of meropenem, increasing meropenem levels. **Coadministration is not recommended.** - **Oral Anticoagulants (e.g., Warfarin)**: May enhance anticoagulant effect; **monitor INR** closely. ## Monitoring & Follow-up - **Before Treatment**: Obtain cultures (if possible), assess renal function (CrCl). - **During Treatment**: - **Renal function (CrCl)**: Daily/every other day if impaired or unstable. - **Liver function tests (LFTs)**: If prolonged treatment or hepatic impairment. - **Complete Blood Count (CBC)**: For prolonged courses (monitor for neutropenia). - **Clinical Signs**: Monitor for signs of superinfection (e.g., CDAD), seizures, significant rash. ## Clinical Pearls - 💡 **Tip 1**: Meropenem is a **broad-spectrum carbapenem**, often reserved for multi-drug resistant (MDR) infections. - 💡 **Tip 2**: Consider **prolonged infusions** (e.g., over 3 hours) for critically ill patients to optimize time above MIC. - 💡 **Tip 3**: **Crucially avoid coadministration with valproate** due to significant reduction in valproic acid levels and potential for seizures. - 💡 **Tip 4**: Always confirm **beta-lactam allergy history** (especially penicillin) due to potential cross-reactivity. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.