Meclizine is an antihistamine commonly used to prevent and treat nausea, vomiting, and dizziness caused by motion sickness. It works by blocking certain signals in the brain that trigger these symptoms, making it effective for people who experience discomfort while traveling. In addition to motion sickness, Meclizine may also be prescribed for managing symptoms of vertigo associated with inner ear problems. It is available in both prescription and over-the-counter forms, and users should follow dosage instructions carefully to avoid potential side effects, such as drowsiness or dry mouth.