A 33-year-old member asked:
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how long for zyrtec (cetirizine) to work?

1 doctor answer
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
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 on May 3, 2017

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Related questions:

A 40-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
About 1 hour: Onset of relief with zyrtec (cetirizine) is about 1 hour.
A 2-year-old male asked:
Dr. Sathish Adigopula
19 years experience Pediatrics
.: You could possibly alternate but cetirazine is a better option than Diphenhydramine as there is less sedation. If you are looking for long term medica ... Read More
2
2 thanks
A 39-year-old member asked:
Dr. Ryan Phasouk
17 years experience Family Medicine
Effects: The effects of zyrtec (cetirizine) should last up to 24 hours.
A 49-year-old member asked:
Dr. Richard Wasserman
43 years experience Allergy and Immunology
Zyrtec (cetirizine) use: Zyrtec (cetirizine) can be taken daily indefinitely, there are no long term side effects from accumulated drug.
4
4 thanks

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