Final answer:
Acepromazine is classified as a tranquilizer and is related to phenothiazines, which are used to treat psychiatric illnesses and have calming effects.
Step-by-step explanation:
Acepromazine is classified as a tranquilizer. It's part of the phenothiazines class which are commonly used in the medical field for various psychiatric illnesses. These drugs, including chlorpromazine which is the prototype, have several clinically useful properties, ranging from antiemetic, antinausea, to antihistaminic effects. They can also enhance the effects of analgesics and general anesthetics. Although acepromazine is not an antipsychotic on its own, it is related in function and may also be referred to as a neuroleptic due to its calming, anti-anxiety, and tranquilizing effects, without causing a loss of consciousness.