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Houma, LA
A 18-year-old male asked:

Does long term use of zyrtec (cetirizine) cause possible forgetfulness and drowsiness?

1 doctor answer2 doctors weighed in
Dr. Michelle Zetoony
Sleep Medicine 19 years experience
It can: Zyrtec (cetirizine) is antihistamine and histamine is active in brain so it is entirely possible to cause mental cloudiness and neuro changes. Has less 'sleepiness' than other antihistamines but doesn't mean it is without side effects.
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Last updated Nov 14, 2020


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