Acepromazine for Tranquilizing Male Horses: Pros and Cons

Acepromazine, often called simply Ace, is commonly used to tranquilize horses for veterinary procedures. However, its use in male horses can cause penile prolapse, or an inability to retract the penis back into the sheath. This effect is desired in some instances, such as when acepromazine helps the horse "let down" for sheath cleaning.

In rare cases, however, this prola

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