Which alpha-2 agonist is FDA-approved in horses and used as a sedative to facilitate handling, examination and treatment; premed prior to general anesthesia?

• A. Detomidine
• B. Romifidine
• C. Glycopyrrolate
• D. Propantheline

Answer: (B)

Romifidine is an alpha-2 adrenergic agonist that provides reliable sedation and analgesia in horses, making handling, examination, and treatment much easier and safer. It is approved by the FDA for equine use and is commonly used as a premed before general anesthesia because its effects are predictable and it tends to produce calming sedation with relatively good cooperation and less hindlimb ataxia than some other sedatives. The sedation helps with restraining the horse for procedures and allows smoother induction of anesthesia when needed. If rapid reversal is required, an appropriate alpha-2 antagonist such as atipamezole can be used.

The other options aren’t alpha-2 sedatives for this purpose: glycopyrrolate and propantheline are anticholinergics used to reduce secretions or counter vagal effects, not to provide the sedative/analgesic effect needed for handling and premedication. Detomidine is another alpha-2 agonist, but the question highlights the equine FDA-approved option most commonly used as a premed sedative, which is romifidine.