Phenylephrine (hydrochloride) (Standard) is the analytical standard of Phenylephrine (hydrochloride). This product is intended for research and analytical applications. (R)-(-)-Phenylephrine hydrochloride is a selective alpha1-adrenoceptor agonist with pKis of 5.86, 4.87 and 4.70 for alpha1D, alpha1B and alpha1A receptors respectively.