There are several sulfonamie-based groups of drugs. The original antibacterial sulfonamides (sometimes called simply sulfa drugs) are synthetic antimicrobial agents that contain the sulfonamide group. Some sulfonamides are also devoid of antibacterial activity, e.g., the anticonvulsant sultiame. The sulfonylureas (main article: sulfonylureas) and thiazide diuretics (main article thiazide) are newer drug groups based on the antibacterial sulfonamides.