Trihexyphenidyl HCl is a synthetic antispasmodic drug. It is designated chemically as α-Cyclohexylα-phenyl-1-piperidinepropanol hydrochloride and its structural formula is as follows:
Trihexyphenidyl HCl occurs as a white or creamy-white, almost odorless, crystalline powder. It is very slightly soluble in ether and benzene, slightly soluble in water and soluble in methanol.
Trihexyphenidyl Hydrochloride Tablets USP 2 mg and 5 mg contain the following inactive ingredients: magnesium stearate, microcrystalline cellulose and sodium starch glycolate.