Which medication is commonly used for treatment of urinary tract infections (UTIs)?

The treatment of urinary tract infections (UTIs) often involves the use of various antibiotic classes. Among the options provided, sulfonamides are a class of antibiotics that have been historically used in the treatment of UTIs. This class includes drugs like sulfamethoxazole, which, when combined with trimethoprim, forms a commonly used antibiotic regimen (known as TMP-SMX).

Sulfathiazole specifically, while a sulfonamide, may not be the first-line treatment for UTIs in current practice, as there are more effective and commonly prescribed alternatives. However, the broader category of sulfonamides remains relevant in the context of UTI treatment.

Levofloxacin, on the other hand, is a fluoroquinolone that is also used to treat UTIs effectively, and it may indeed be very common in certain situations, but it is categorized differently than sulfonamides. Ampicillin is a penicillin-type antibiotic and is less commonly used due to resistance issues. Thus, while levofloxacin is an effective option, the question asks for a broader category that encompasses various agents used for UTIs, making sulfonamide a relevant choice overall.