Adult 750 mg tds IM or IV, for severe infections dose may be increased to 1.5 g IV tds.
Infant & childn 30-100 mg/kg daily IV in 3-4 divided doses. 60 mg/kg daily may be given for most infections.
Neonate 30-100 mg/kg daily in 2-3 divided doses.
Gonorrhoea 1.5 g as single dose.
Meningitis Adult 3 g IV 8 hrly.
Infant & childn 200-240 mg/kg daily IV in 3-4 divided doses, reduced to 100 mg/kg daily IV after 3 days.
Neonate Initially 100 mg/kg daily IV, may be reduced to 50 mg/kg daily as indicated.
Prophylaxis 1.5 g IV w/ anaesth induction.