SN instructed patient about Meclizine is an antihistamine that reduces the effects of natural chemical histamine in the body. It is used to treat or prevent nausea, vomiting, and dizziness caused by motion sickness. It is also used to treat symptoms of vertigo (dizziness or spinning sensation) caused by disease that affects your inner ear. S/E include dry mouth, headache, vomiting, tired feeling and drowsiness.