As with other drugs, cetirizine can cause side effects, such as drowsiness and sore throat. If you are not able to tolerate side effects from cetirizine, talk with your doctor or pharmacist.

Medically reviewed by Lindsay Cook, PharmD Xyzal (levocetirizine) and Zyrtec (cetirizine) are antihistamines taken to relieve allergy symptoms such as sneezing, runny nose, itchy eyes, and hives.

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

Cetirizine HCl 5mg, pseudoephedrine HCl 120mg; ext-rel tabs. Hydroxyzine sensitivity. Narrow-angle glaucoma. Urinary retention. Severe hypertension or coronary artery disease. During or within 14 ...