Drug	Dosage
Trimethoprim-sulfamethoxazole (Bactrim DS, Septra DS)	One double-strength (160 mg/800 mg) tablet taken orally twice daily for three days
Trimethoprim (Trimpex)	One 100-mg tablet taken orally twice daily for three days
Nitrofurantoin (Macrobid, Macrodantin)	One 100-mg tablet taken orally four times daily for three days