U.S. doctors online nowAsk doctors free
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.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Nov 14, 2020


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.