IM: Adults: 250-1000 mg 4 times daily. Children: 50-100 mg/kg body weight/day in 4 divided doses.
IV: Adults: 1-2 g daily in 1 or 2 equal doses.
IV Infusion: Adults: 2-4 g daily in 1 or 2 equal doses over 1-2 hrs. Children: 100-200 mg/kg body weight/day.