Sulfanilamide is a type of antibiotic medication used to treat bacterial infections. There are several synonyms for sulfanilamide, including sulphamethazine, sulfadiazine, and sulfamethoxazole. These medications work by inhibiting the growth of bacteria by interfering with their ability to produce folic acid. Sulfanilamide was first discovered in the 1930s and was one of the first antibiotics available to effectively treat bacterial infections. While it is no longer commonly used as a stand-alone medication, it is still used in combination with other antibiotics for certain types of infections, such as urinary tract infections and meningitis.