Adult & childn >12 yr 1-2 g once daily depending on type & severity of infection. Max: 4 g daily.
Uncomplicated gonococcal infection 250 mg IM as a single dose.
Childn <12 yr & infant For serious infection other than meningitis 50-75 mg/kg daily in equally divided doses 12 hrly. Max: 2 g/day.
Meningitis 100 mg/kg daily in divided doses 12 hrly w/ or w/o a loading dose of 75 mg/kg. Max: 4 g/day.
Pre-op use (surgical prophylaxis) 1 g as a single dose ½-2 hr before surgery. To be administered by IV, IM or short IV infusion.