Sedation
"Hydroxyzine is an oldie; but a keeper. It is more powerful than it&#039;s younger brother Zyrtec and lasts 24-36 hours. If taken at night, there is little chance of a &#039;hangover effect&#039; or residual drowsiness. It is probably the safest and most effective sleep medication available; and you don&#039;t build a tolerance or addiction. As a HCL salt; check your liver and kidneys annually to make sure there are no ill affects which are rare."