Ciprofloxacin (Cipro), 500 mg twice daily for one to three days, or one 750-mg dose (if diarrhea resolves)

Norfloxacin (Noroxin), 400 mg twice daily for one to three days

Ofloxacin (Floxin), 300 mg twice daily for one to three days

Trimethoprim-sulfamethoxazole (Bactrim DS), 160 mg/800 mg twice daily for three days

Doxycycline (Vibramycin), 100 mg twice a day for three days