While Zyrtec side effects are typically mild, some rare serious side effects are possible, including irregular heartbeat and ...

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

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 ...