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A 17-year-old female asked:

I just got zyrtec (cetirizine) oral drops which allow me to be alert. will it cause insomnia if i take it at bedtime? i am still afraid it may make me drowsy...

1 doctor answer3 doctors weighed in
Dr. John Chiu
Allergy and Immunology 58 years experience
Unlikely: Zyrtec (cetirizine) causes drowsiness (usually mild) in only about 10% of the people and given your paradoxical response, it may indeed keep you awake at night. Try something else.
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Last updated Nov 14, 2020

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