Antibiotic therapy - Age 7-50 years
In an older child or an otherwise healthy adult (7-50 y), the most common microorganisms are S pneumoniae, N meningitidis, and L monocytogenes.
In areas where prevalence of DRSP is greater than 2%, primary treatment is either cefotaxime (pediatric dose: 50 mg/kg IV q6h up to 12 g/d; adult dose: 2 g IV q4h) or ceftriaxone (pediatric dose: initial dose: 75 mg/kg, then 50 mg/kg q12h up to 4 g/day; adult dose: 2 g IV q12h) plus vancomycin (pediatric dose: 15 mg/kg IV q8h; adult dose: 750-1000 mg IV q12h or 10-15 mg/kg IV q12h). Some add rifampin (pediatric dose: 20 mg/kg/d IV; adult dose: 600 mg PO qd). If Listeria species is suspected, add ampicillin (50 mg/kg IV q6h).
Alternative treatment (or if severely penicillin allergic) is chloramphenicol (12.5 mg/kg IV q6h: not bactericidal) or clindamycin (pediatric dose: 40 mg/kg/day IV in 3-4 doses; adult dose: 900 mg IV q8h: active in vitro but no clinical data) or meropenem (pediatric dose: 20-40 mg/kg IV q8h; adult dose: 1 g IV q8h: active in vitro but few clinical data; avoid imipenem, as it is proconvulsant).
In areas with low prevalence of DRSP, use cefotaxime (pediatric dose: 50 mg/kg IV q6h up to 12 g/d; adult: 2 g IV q4h) or ceftriaxone (pediatric dose: 75 mg/kg initial dose then 50 mg/kg q12h up to 4 g/d; adult: 2 g IV q12h) plus ampicillin (50 mg/kg IV q6h).
Alternative treatment (or if severely penicillin allergic) is chloramphenicol (12.5 mg/kg IV q6h) plus trimethoprim/sulfamethoxazole (TMP/SMX; TMP 5 mg/kg IV q6h) or meropenem (pediatric dose: 20-40 mg/kg IV q8h; adult dose: 1 g IV q8h).
Data are limited on the need for dexamethasone in adults, although there is support for its use in developed countries when S. pneumoniae is the suspected organism. Administer the first dose of dexamethasone (0.4 mg/kg q12h IV for 2 d or 0.15 mg/kg q6h for 4 d) 15-20 minutes before first dose of antibiotics.
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