Which drug is a reversal agent for medetomidine (alpha-2 agonist) sedation?

• A. Yohimbine
• B. Tolazoline
• C. Naloxone
• D. Atipamezole

Answer: (D)

Reversal of alpha-2 agonist sedation requires a selective antagonist that blocks alpha-2 receptors to rapidly counteract the sedative and analgesic effects. The best fit is Atipamezole, a potent and selective alpha-2 adrenergic receptor antagonist designed for veterinary use. It directly blocks the receptors medetomidine activates, allowing a quick and predictable regain of wakefulness and normal sympathetic function. Other options like yohimbine or tolazoline are less selective and can produce more variable responses or additional side effects, while naloxone targets opioid receptors and won’t reverse medetomidine’s actions. So, atipamezole is the preferred reversal for medetomidine.