Adult & childn >12 yr 400 mg as a single dose or in 2 divided doses.
Childn 8 mg/kg/day as single or in 2 divided doses.
Renal impairment CrCl >60 mL/min Usual dose;
21-60 mL/min or on hemodialysis 75% standard dose at standard dosing interval;
20 mL/min or on continuous ambulatory peritoneal dialysis ½ standard dose at standard dosing interval. Course of treatment: 7-14 days.