Bactrim for Urinary Tract Infections (UTI)
Bactrim® (sulfamethoxazole/trimethoprim) is a type of prescription antibiotic used to treat several infections, including urinary tract infections (UTIs). Bactrim works to treat infections such as these by interfering with the ability of bacteria to grow and multiply.
Bactrim contains two different antibiotics, sulfamethoxazole and trimethoprim. These two antibiotics work in different but similar ways. Essentially, both sulfamethoxazole and trimethoprim work by inhibiting the production of folic acid in bacteria, although they work in different stages of folic acid production. Folic acid is important for making proteins and DNA. Combining sulfamethoxazole with trimethoprim increases the effectiveness and decreases the chance of antibiotic resistance (when bacteria develop the ability to resist antibiotics).
Bactrim is approved for treating urinary tract infections only when they are caused by certain types of bacteria. Not all bacteria will respond to Bactrim. Even among the types of bacteria that do respond to Bactrim, some strains may have become resistant and may have different resistance patterns in different regions in the country. This means that some bacteria may be susceptible to Bactrim in certain parts of the country but not in others.
(Click Bactrim Uses for a complete overview of the benefits of Bactrim. This article also covers other Bactrim uses, offers more details on how this medication works, and discusses whether it is safe for use in children.)