A 40-year-old member asked:
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how long does zyrtec (cetirizine) take to work?

1 doctor answer
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
About 1 hour: Onset of relief with zyrtec (cetirizine) is about 1 hour.
Answered on Oct 7, 2018

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A male asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
Depends: on the condition, some would take it for years, but if you need it for long, better run it by tour doctor, best wishes
A 33-year-old member asked:
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. ... Read More
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
A 32-year-old member asked:
Dr. David Martin
27 years experience ENT and Head and Neck Surgery
Effects of Zyrtec (cetirizine): The half-life of Cetirizine (the time it takes for your body to get rid of half of the drug) is about 8 hours. The vast majority should be gone withi ... Read More

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