250-500 mg bid for 5-7 days.
 Infections of the kidneys, urinary tract & abdominal cavity Mild to moderate: 250 mg bid, Severe complicated: 500 mg bid.
 Infections of the resp tract, bone, & joint, skin & skin structures Mild to moderate: 500 mg bid, Severe complicated: 750 mg bid. 
Infectious diarrhea & typhoid fever 500 mg bid. 
Infections of the middle ear (otitis media), paranasal sinuses (sinusitis) 500 mg bid. 
Bacterial prostatitis 500 mg bid. 
Acute uncomplicated gonorrhea & cystitis 250 mg single dose.