Qualified Medication Aides Practice Exam 2026 – Complete Test Preparation

Phenergan, also known by its generic name promethazine, is primarily used as an antihistamine. Its main function is to block the action of histamine, a substance in the body that is responsible for allergic symptoms, motion sickness, and nausea. This mechanism helps alleviate symptoms associated with allergies, such as sneezing and itching, as well as preventing nausea and vomiting, especially related to motion sickness or anesthesia.

While Phenergan may have other secondary uses, such as being involved in controlled allergic reactions and having some sedative properties, its primary role is indeed to block histamine receptors. Hence, recognizing this function highlights its importance in managing allergic reactions and preventing nausea, distinguishing it from other types of medications used for laxative effects, pain relief, or inflammation reduction.