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

If side effects occur, they are usually mild ... Both medications can effectively treat allergy symptoms in adults and children, but Zyrtec-D may be preferred if symptoms include nasal congestion.

oral Cetirizine , , and are used in adults and children at least ... You may report side effects to FDA at 1-800-FDA-1088. Use Zyrtec Liquid Gels (Oral) exactly as directed on the label, or ...