PROMETHAZINE prevents and treats the symptoms of an
allergic reaction. It works by blocking histamine, a substance released by the body during an allergic reaction. It may also help you relax, go to sleep, and relieve
nausea, vomiting, or
pain before or after procedures. It can also prevent and treat
motion sickness. It works by helping your nervous system calm down by blocking substances in the body that may cause
nausea and vomiting. It belongs to a group of medications called
antihistamines.