Meclizine is an antihistamine that is commonly used to prevent nausea, vomiting and dizziness associated with motion sickness, according to Drugs.com. It is also used to manage the symptoms of vertigo.
Meclizine should be taken exactly as prescribed, states Drugs.com. Common side effects include feeling tired, drowsiness, dry mouth, vomiting or headache. A patient who experiences side effects such as a rapid heartbeat or tightness in the chest should call a doctor immediately. Side effects such as difficulty breathing, hives or swelling around the face or eyes can be signs of a serious allergic reaction, and anyone experiencing those symptoms should seek emergency treatment.