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

They have few side effects and can really ... Any of the newer antihistamines, such as loratadine (Claritin, Alavert), desloratadine (Clarinex), cetirizine (Zyrtec), levocetirizine (Xyzal) and ...

If side effects occur, they are usually mild ... They both contain the antihistamine cetirizine. Additionally, the "D" in Zyrtec-D stands for decongestant. Zyrtec-D contains the decongestant ...

If you take a combination cold medicine that contains an antihistamine, a decongestant, and/or another active ingredient, it may cause these or other side effects. See a health care provider right ...