乙酰丙嗪是一种橙黄色油状液体。沸点220-240℃（66.5Pa）。其马来酸盐为黄色结晶，熔点135-136℃，溶于水，0.1%的水溶液pH为5.2，无臭。味苦。用途与氯丙嗪相似，但安定作用比氯丙嗪弱，疗效较差。用于镇静、抗精神病、镇吐、镇痛和抗惊厥等。与止痛药、催眠药、局部麻醉药等合用时能加强其作用。与哌替啶、异丙嗪合用为人工冬眠剂。

Acepromazine or acetylpromazine (more commonly known as ACP, Ace, or by the trade names Atravet or Acezine 2, number depending on mg/ml dose) is a phenothiazine derivative antipsychotic drug. It was first used in humans in the 1950s, but is now little used in humans (the closely related analogue, chlorpromazine, is still used as an antipsychotic in humans). Acepromazine is frequently used in animals as a sedative and antiemetic. Its principal value is as a chemical restraint in hyper or fractious animals. However it does not relieve anxiety and some believe it may make anxiety worse in the long run if used in an anxious animal (for example, thunderstorm phobias). The standard pharmaceutical preparation, acepromazine maleate, is used in veterinary medicine in dogs, and cats. It is used widely in horses as a pre-anaesthetic sedative and has been shown to reduce anaesthesia related death. However, it should be used with caution (but is not absolutely contraindicated) in stallions due to the risk of paraphimosis and persistent priapism. Its potential for cardiac effects, namely hypotension due to peripheral vasodilation, can be profound and as such is not recommended for use in geriatric or debilitated animals, especially dogs. In these cases it is most often substituted with midazolam or diazepam and left out of the preanesthetic medication altogether.