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A member asked:
Hydroxyzine made me feel lightheaded every time i stood up or took a deep breath the day after, long after it should have been out of my system, why?
A doctor has provided 1 answer
Long acting: The antihistaminic effect of Hydroxyzine lasts for at least 72 hours. However it is unusual but not impossible for the sedating effect to last more than 24 hours.
Answered 6/25/2014
4.9k views
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