Sulfisoxazole, also known as sulfafurazole, is a sulfonamide antibiotic belonging to the sulfa drug class. Chemically described as 4-amino-N-(3,4-dimethyl-5-isoxazolyl)benzenesulfonamide, sulfisoxazole inhibits bacterial growth by interfering with the synthesis of folic acid. This mechanism of action targets dihydropteroate synthase, an enzyme essential for bacterial folate production, thereby impeding their growth and proliferation.