system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Selective Alpha 2a agonist is
assistant
The correct answer is  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