what is the strongest antibiotic for a bladder infection?
['Ampicillin.', 'Ceftriaxone (Rocephin)', 'Cephalexin (Keflex)', 'Ciprofloxacin (Cipro)', 'Fosfomycin (Monurol)', 'Levofloxacin (Levaquin)', 'Nitrofurantoin (Macrodantin, Macrobid)', 'Trimethoprim/sulfamethoxazole (Bactrim, Septra)']