Acepromazine or Acetylpromazine is one of the phenothiazine derivative psychotropic drugs, used little in humans, however frequently in animals as a means of chemical restraint. Its principal value is in quietening and calming frightened and aggressive animals. The standard pharmaceutical preparation, acepromazine maleate, is used extensively in equine, feline, and canine; especially as a pre-anesthetic agent. Phenothiazines are the largest of the 5 main classes of antipsychotic drugs. ... A psychoactive drug or psychotropic substance is a chemical that alters brain function, resulting in temporary changes in perception, mood, consciousness, or behaviour. ...
Acepromazine maleate is a phenothiazine derivative that is used as a neuroleptic agent in veterinary medicine.
Acepromazine is metabolized by the liver and excreted in the urine.
Acepromazine is also used in horses that are prone to exertional rhabdomyolysis both as a preventative, and as a part of the treatment due to its vasodilatory properties.