Adult 750 mg 8 hrly
Severe infection 1.5 g IV 6-8 hrly.
Infant & childn 25-100 mg/kg in 3-4 divided doses.
Most infection 60 mg/kg/day.
Neonate 30-100 mg/kg/day in 2 or 3 divided dose in the 1st wk of life.
Gonorrhea 1.5 g as single dose.
Meningitis Adult 3 g IV 8 hrly.
Infant & childn 200-240 mg/kg daily IV in 3 or 4 divided dose, may be decreased to 100 mg/kg daily after 3 days.
Neonate Initially 100 mg/kg/day IV, may be reduced to 50 mg/kg/day IV.