succinylsulfathiazole succinylsulfathiazole succinylsulfathiazole (also known as sulfasuxidine) is a sulfonamide. it is also spelled as succinylsulphathiazole. it is a white or yellow-white crystalline powder. it dissolves in aqueous solutions of alkali hydroxides and carbonates but is very slightly soluble in water. succinylsulfathiazoleclinical dataatc codea07ab04 (who) identifiers iupac name 4-oxo-4-(amino)butanoic acid cas number116-43-8pubchem cid5315uniirss8647o4skeggd07060 ychemblchembl1484857comptox dashboard (epa)dtxsid7045281 echa infocard100.003.765 chemical and physical dataformulac13h13n3o5s2molar mass355.38 g·mol−13d model (jsmol)interactive image smiles oc(=o)ccc(=o)nc1ccc(cc1)s(=o)(=o)nc2nccs2 (verify) it is classified as ultra long-acting drug. about 95% of the drug remains in the intestine and only 5% is hydrolyzed, slowly, to sulfathiazole and is absorbed. the drug is used for its antibacterial activity in the git. the dose is 10g - 20g daily in divided doses. the succinyl group is attached to form a prodrug for the controlled release of the drug sulfathiazole.