Zyrtec Side Effects, Important Information, Before Taking & How to Take

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Zyrtec Side Effects. Adults and children ≥12 years of age: Somnolence, fatigue, dry mouth. Insomnia reported with cetirizine (the active ingredient contained in Zyrtec) hydrochloride-pseudoephedrine hydrochloride fixed combination.
Children 2–11 years of age: Headache, pharyngitis, abdominal pain.
Children 6 months to 2 years of age: Irritability, fussiness, insomnia, fatigue, malaise.

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