What is the definition or description of: haloperidol allergy?

Adverse effects: Technically, allergy refers to reactions involving skin effects, itching, or, more urgently, breathing and rapid heart (emergency!). They are uncommon with haloperidol. But "allergy" is often used loosely to refer to other adverse effects, some serious, some not. Including unusual ones, the list is long. If you are concerned, speak further with your doctor. An individualized answer for you.