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Uncomplicated gonorrhoea
Adult: 500 mg as a single dose.
Intramuscular
Mild to moderate susceptible infections
Adult: 500 or 750 mg every 12 hr.
Intravenous
Prophylaxis of surgical infections
Adult: 1 g may be given on induction of anaesthesia, followed by 1 g 3 hr later, with additional doses of 500 mg at 8 and 16 hr after induction if necessary.
Intravenous
Susceptible infections
Adult: Combined with cilastatin: (as anhydrous imipenem) 1-2 g daily in divided doses every 6-8 hr, given via IV infusion. Doses 250 or 500 mg are infused over 20-30 min, and doses of 750 mg or 1 g over 40-60 min. Max: 4 g/day or 50 mg/kg.
Child: >40 kg: same as adult dose. Child >3 mth and <40 kg: 15-25 mg/kg every 6 hr by IV infusion. Doses up to 90 mg/kg may be given to older children with cystic fibrosis. Neonates and infants <3 mth: 4 wk-3 mth, 25 mg/kg every 6 hr; 1-4 wk, 25 mg/kg every 8 hr; up to 1 wk, 25 mg/kg every 12 hr. Max: >40 kg: 4 g/day or 50 mg/kg; <40 kg: 2 g/day.
Child: >40 kg: same as adult dose. Child >3 mth and <40 kg: 15-25 mg/kg every 6 hr by IV infusion. Doses up to 90 mg/kg may be given to older children with cystic fibrosis. Neonates and infants <3 mth: 4 wk-3 mth, 25 mg/kg every 6 hr; 1-4 wk, 25 mg/kg every 8 hr; up to 1 wk, 25 mg/kg every 12 hr. Max: >40 kg: 4 g/day or 50 mg/kg; <40 kg: 2 g/day.
