Selective Alpha 2a agonist is: (A) Tizanidine, (B) Terazosin, (C) Yohimbine, (D) Dexmedetomidine
Answer is D. Clonidine, Tizanidine are selective alpha 2 agonists. But dexmedetomidine is more selective acting on Alpha 2a receptors-cause sedation. Used as pre-anesthetic medication. Ref: H.L. Sharma 3rd ed Pg:179