Get emergency medical help if you have signs of an allergic reaction to Vistaril: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
In rare cases, Vistaril may cause a severe skin reaction. Stop taking this medicine and call your doctor right away if you have sudden skin redness or a rash that spreads and causes white or yellow pustules, blistering, or peeling.
Stop using Vistaril and call your doctor at once if you have:
fast or pounding heartbeats;
headache with chest pain;
severe dizziness, fainting; or
a seizure (convulsions).
Side effects such as drowsiness and confusion may be more likely in older adults.
Common Vistaril side effects may include:
drowsiness;
headache;
dry mouth; or
skin rash.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Vistaril side effects (more detail)
