Dexmedetomidine- 13 C,d 3 (hydrochloride) is the 13 C- and deuterium labeled Dexmedetomidine (hydrochloride). Dexmedetomidine hydrochloride ((+)-Medetomidine hydrochloride) is a potent, selective and orally active agonist of α2-adrenoceptor, with a Ki of 1.08 nM. Dexmedetomidine hydrochloride shows 1620-fold selectivity against α1-adrenoceptor. Dexmedetomidine hydrochloride exhibits anxiolysis, sedation, and modest analgesia effects.