SN instructed patient that Meclizine is an antihistamine that is used to prevent and treat nausea, vomiting, and dizziness caused by motion sickness. It may also be used to reduce dizziness and loss of balance (vertigo) caused by inner ear problems. SN instructed that drowsiness, dry mouth, and tiredness may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.