Antibiotic	Usual adult dosage*	Cost†
First-line therapy
Trimethoprim-sulfamethoxazole, double-strength (Bactrim DS)	160/800 mg twice daily	$ 25.00; generic: 8.00
Amoxicillin	500 mg three times daily	12.00; generic: 10.00 to 14.00
Second-line therapy
Amoxicillin-clavulanate potassium (Augmentin)	500/125 mg three times daily	94.00
Cefaclor (Ceclor)	500 mg three times daily	128.00; generic: 115.00 to 117.00
Cefuroxime (Ceftin)	500 mg twice daily	132.00
Cefixime (Suprax)	400 mg twice daily	135.00
Clarithromycin (Biaxin)	500 mg twice daily	65.00
Doxycycline (Vibramycin)	200 mg on day 1, then 100 mg on days 2 through 10	21.00; generic: 2.00 to 6.00