IV/IM Slow IV inj over at least 2-4 min. Intermittent IV infusion over at least 30 min or by deep IM inj. Dose >1 g should be injected IM & divided between >1 site.
Adult 1-2 g daily as a single dose or in 2 divided doses.
Severe infections Up to 4 g daily.
Childn <50 kg & infant 20-50 mg/kg once daily.
Severe infections Max: 80 mg/kg daily.
Neonate Max: 50 mg/kg daily. IV doses should be given over 60 min. Doses >50 mg/kg should be given by IV infusion only.
Uncomplicated gonorrhea 250 mg as single IM dose.
Surgical infection prophylaxis 1 g as a single dose given 0.5-2 hr before surgery; 2-g dose before colorectal surgery.
Prevention of secondary cases of meningococcal meningitis Adult 250 mg as a single IM dose.
Childn 125 mg as a single IM dose.