The chemical Paroxetine Hydrochloride Hemihydrate has a known molecular formula of C19-H20-F-N-O3.Cl-H.1/2H2-O. Synonyms may include: Paroxetine hydrochloride hemihydrate, (-)-trans-4-(4-Fluorophenyl)-3-(3,4-methylenedioxyphenoxymethyl)piperidine hydrochloride hemihydrate, Paroxetine HCl hydrate, UNII-X2ELS050D8 (ChemID). Paroxetine Hydrochloride Hemihydrate has been assigned a MeSH pharmacological action of: Cytochrome P-450 CYP2D6 Inhibitor, Serotonin Uptake Inhibitor.