Medically reviewed by Daniel More, MDMedically reviewed by Daniel More, MD Common side effects of Zyrtec (cetirizine) can include drowsiness, fatigue, dry mouth, sore throat, and dizziness.
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.