A member asked:

How long does it take for vistaril (hydroxyzine) to start to work?

A doctor has provided 1 answer

Vistaril (hydroxyzine) action : Vistaril (hydroxyzine) is an antihistamine that is available in a liquid, tablet, and im forms. The onset of action of the injectable for is minutes, while the oral routes start in 30 minutes to 2 hours.

Answered 8/1/2019

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