Does Zyrtec Cause Weight Gain?

Zyrtec (cetirizine) does not typically cause weight gain as a direct side effect. Clinical studies show that weight gain occurs in less than 2% of patients taking cetirizine, which is similar to placebo rates. However, some people may experience increased appetite due to improved allergy symptoms, leading to indirect weight changes. The most common side effects of Zyrtec include drowsiness (14% of users), dry mouth, and fatigue. If you notice unexplained weight changes while taking Zyrtec, other factors like seasonal eating patterns, reduced activity due to allergies, or concurrent medications may be responsible. Track your symptoms and discuss any concerns with your healthcare provider to determine the best allergy management approach for you.

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