Which is a common side effect of acepromazine in horses?

Acepromazine is a tranquilizer commonly used in horses for sedation and anxiety relief. One notable side effect that can occur with this drug is priapism, which is a prolonged and often painful erection not associated with sexual desire. This side effect arises because acepromazine can influence blood flow and vascular resistance, leading to persistent engorgement of the penis in male horses.

While acepromazine is more commonly known for its sedative effects, it can also have a unique profile of side effects, and priapism is particularly significant in the equine population. The occurrence of priapism, although relatively rare, is a critical aspect for veterinarians to monitor, especially when the drug is administered in higher doses or when combined with other medications.

The other options listed, while they may be side effects of other medications or conditions, do not typically occur with acepromazine use. Increased heart rate, fever, and vomiting are not commonly associated with this tranquilizer in horses, highlighting priapism as a notable and specific concern for equine practitioners when using acepromazine.