Adult & childn >12 yr 1-2 g once daily.
Severe infection May be increased up to 4 g once daily.
Neonate, infant & childn (15 days-12 yr) 20-80 mg/kg once daily.
Neonate up to 14 days 20-50 mg/kg once daily, not to exceed 50 mg/kg.
Meningitis Infant & childn Initially 100 mg/kg once daily. Max: 4 g once daily.
Lyme borreliosis Adult & childn 50 mg/kg once daily for 14 days. Max: 2 g daily.
Gonorrhea 250 mg single IM dose.
Peri-op prophylaxis 1-2 g single dose 30-90 min pre-op.