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Bozeman, MT
A 37-year-old female asked:

I am on zyrtec (cetirizine) and flonase for severe hayfever. neither should cause drowsiness but i feel severely tired&like i almost have to be reminded to breathe?

1 doctor answer2 doctors weighed in
Dr. John Chiu
Allergy and Immunology 59 years experience
Not true: Zyrtec (cetirizine) can cause significant drowsiness in up to 10% of the people.
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Last updated May 3, 2018

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