Sulfamethoxazole is an antibiotic that belongs to the class of drugs known as sulfonamides. It works by inhibiting the growth of bacteria, making it effective against various bacterial infections. It is often used in combination with another antibiotic, Trimethoprim, to enhance its effectiveness. This medication is commonly prescribed for treating urinary tract infections, respiratory infections, and certain types of gastrointestinal infections. While generally safe, it can cause side effects such as allergic reactions or gastrointestinal disturbances. Patients should follow their healthcare provider's instructions when using sulfamethoxazole.