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

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

Cetirizine is used to treat cold or allergy symptoms such as ... 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 ...

Antihistamines — like Claritin, Allegra, or Zyrtec — can reduce ... for children who suffer from allergy symptoms. However, they may also have more side effects for children.