The chemical Ketotifen fumarate has a designated molecular formula of C23H23NO5S and a molecular weight of 425.499 g/mol. Synonyms may include: EINECS 252-100-0, Zaditen, Ketotifen hydrogen fumarate, Zaditor, Alaway, Ketotifen, UNII-HBD503WORO (ChemID). Ketotifen fumarate has been assigned a MeSH pharmacological action of: Histamine H1 Antagonist.