## Empiric Antibiotic Therapy for Early-Onset Neonatal Sepsis (EONS) **Key Point:** The empiric regimen for EONS in term neonates in India is **Ampicillin + Gentamicin**, chosen to cover both GBS (if present) and Gram-negative organisms (E. coli, Klebsiella). ### Rationale for Ampicillin + Gentamicin | Drug | Target Organisms | Rationale | |------|------------------|----------| | Ampicillin | GBS, Listeria monocytogenes, E. coli (some strains) | Covers penicillin-susceptible pathogens; good CSF penetration | | Gentamicin | Gram-negative organisms (E. coli, Klebsiella, Enterobacter) | Synergistic with ampicillin; covers resistant Gram-negatives | ### Dosing in Term Neonates - **Ampicillin**: 50 mg/kg/dose IV/IM every 6–8 hours (200 mg/kg/day) - **Gentamicin**: 7.5 mg/kg/dose IV/IM once daily (or 2.5 mg/kg every 8 hours in some protocols) **High-Yield:** This is the **standard first-line regimen** for EONS in India per IAP (Indian Academy of Pediatrics) guidelines. It is NOT used for late-onset sepsis (LONS) or meningitis. **Clinical Pearl:** If meningitis is suspected (CSF pleocytosis, clinical deterioration), switch to **Cefotaxime + Vancomycin** because gentamicin has poor CSF penetration and ampicillin alone may not achieve bactericidal CSF levels against resistant organisms. **Mnemonic:** **AG for EONS** — **A**mpicillin + **G**entamicin for **E**arly-**O**nset **N**eonatal **S**epsis. ### When to Change Regimen 1. **Suspected meningitis**: Switch to Cefotaxime + Vancomycin 2. **Late-onset sepsis (>72 hours)**: Use Cefotaxime + Vancomycin (covers nosocomial pathogens, including resistant Gram-negatives and Staphylococcus) 3. **Culture-directed therapy**: De-escalate once organism and sensitivities are known **Warning:** Cefotaxime + Vancomycin is NOT first-line for EONS in term neonates; it is reserved for meningitis or LONS. Do not confuse EONS regimens with LONS regimens.
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