sulfamethoxazole is an antibiotic that belongs to the sulfonamide class. It works by inhibiting the growth of bacteria, making it effective against various bacterial infections. Commonly, it is used to treat urinary tract infections, respiratory infections, and certain types of gastrointestinal infections. Often, sulfamethoxazole is combined with another antibiotic called trimethoprim, resulting in a medication known as sulfamethoxazole/trimethoprim. This combination enhances its effectiveness and broadens the range of bacteria it can target. It is important to use this medication as prescribed by a healthcare professional to avoid resistance and ensure proper treatment.