noun. a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness.
1. Noun, singular or mass Cetirizine, brand name Zyrtec, is a form of hydroxyzine that does not cross from the blood into the brain, so it typically avoids these side effects. 2. Adjective The first form is hydroxyzine pamoate, the second hydroxyzine hydrochloride 3.