The chemical Tamsulosin hydrochloride has a designated molecular formula of C20H29ClN2O5S and a molecular weight of 444.971 g/mol. Synonyms may include: Amsulosin hydrochloride, R-(-)-5-(2-((2-(2-Ethoxyphenoxy)ethyl)amino)propyl)-2-methoxybenzenesulfonamide hydrochloride, LY253351, YM617, Flomax, Alna, Expros, Josir, Omic, Omix, Omnic, Pradif (ChemID). Tamsulosin hydrochloride has been assigned a MeSH pharmacological action of: Adrenergic alpha-1 Receptor Antagonist.