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Acepromazine is a phenothiazine tranquilizer used by veterinarians as an aid in tranquilization and as a preanesthetic agent.

Side effects of acepromazine include sedation, depression, incoordination, low blood pressure, slower heart rate and breathing. As with any phenothiazine, this medication may color the urine pink. Occasionally, this medication may have an opposite effect causing stimulation and aggression.