Trichomoniasis: Metronidazole is given orally either as a single 2-g dose, as a 2-day course of 800 mg in the morning and 1.2 g in the evening, or as a 7-day course of 600 mg to 1 g daily in two or three divided doses. Sexual partners should also be treated.
Amoebiasis: Metronidazole is given in oral doses of 400 to 800 mg three times daily for 5 to 10 days.
Anaerobic Bacterial Infections: The usual adult oral dosage is 7.5 mg/kg every six hours (approx. 500 mg for a 70 kg Adult). A maximum of 4 gm should not be exceeded during a 24 hour period.
The usual duration of therapy is 7 to 10 days; however, infections of the bone and joint, lower respiratory tract, and endocardium may require longer treatment.
Oral suspension: Children: 35 to 50 mg/kg/24 hours, divided into three doses, orally for 10 days.