Urapidil (hydrochloride) (Standard) is the analytical standard of Urapidil (hydrochloride). This product is intended for research and analytical applications. Urapidil hydrochloride is an orally active alpha1-adrenoceptor antagonist and 5-HT1A receptor agonist with a pIC50 of 6.13 and 4.38 against alpha1- and alpha2-adrenoceptor, respectively. Urapidil hydrochloride shows antihypertensive effect[1][2].