Acute uncomplicated cystitis
Adult: Initially 400 mg followed by 200 mg tid for 8 doses.
Child: <40 kg with UTI: 20-40 mg/kg/day in 3-4 divided doses.
Child: <40 kg with UTI: 20-40 mg/kg/day in 3-4 divided doses.
Oral
Chronic or recurrent bacteriuria
Adult: 400 mg 3-4 times daily.
Child: <40 kg with UTI: 20-40 mg/kg/day in 3-4 divided doses.
Child: <40 kg with UTI: 20-40 mg/kg/day in 3-4 divided doses.