Acepromazine Maleate is a prescription medication primarily used as a tranquilizer, sedative, or pre-anesthetic. It can also be used to prevent vomiting from motion sickness or to alleviate itching from skin irritation. Acepromazine maleate has been used as an adjunctive treatment of laminitis in horses. Acepromazine Maleate Compounded capsule is a blue and white elongated capsule made specifically for your pet.