Meclizine HCL Motion Sickness Treatment - 12.5 mg Meclizine is an antihistamine used to treat and prevent nausea, vomiting, and dizziness associated with air, sea, and car motion sickness.Meclizine Common Uses:It is often used in the treatment and prevention of nausea, vomiting, and dizziness caused by motion sickness. Additionally It may also be used to treat other conditions as determined by your doctor.Meclizine Cautions:Meclizine causes drowsiness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to this medicine. Meclizine will add to the effects of other depressants or alcohol. Ask your pharmacist if you have questions about which medicines are depressants. For Women: It is unknown if meclizine is excreted in breast milk. If you are or will be breast-feeding while you are using meclizine, check with your doctor or pharmacist to discuss the risks to your baby.Possible Side Effects of Meclizine:Side effects, that may go away during treatment, include drowsiness or dry mouth. If they continue or are bothersome, check with your doctor. If you notice other effects not listed above, contact your doctor, nurse, or pharmacist.