Sulfadimethoxine is a sulfonamide consisting of pyrimidine having methoxy substituents at the 2- and 6-positions and a 4-aminobenzenesulfonamido group at the 4-position. It has a role as an antiinfective agent, an antimicrobial agent, a xenobiotic, an environmental contaminant and a drug allergen. It is a member of pyrimidines, a sulfonamide, a substituted aniline, an aromatic ether and a sulfonamide antibiotic. It is functionally related to a sulfanilamide.