A member asked:

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

A doctor has provided 1 answer

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.

Answered 11/14/2020

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