Medically reviewed by Daniel More, MDMedically reviewed by Daniel More, MD Common side effects of Zyrtec (cetirizine) can ...

You may report side effects to FDA at 1-800-FDA-1088. Use Zyrtec Liquid Gels (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or ...

As an antihistamine, Zyrtec works by blocking the action of histamine, a substance in the body that contributes to symptoms ...