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A member asked:
How long for zyrtec (cetirizine) to work?
A doctor has provided 1 answer
About 1 hour: The onset of action for zyrtec (cetirizine) to clinically improve symptoms is about 1 hour. The reference is listed here: http://www.Ncbi.Nlm.Nih.Gov/pubmed/11770694.
Answered 5/3/2017
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