Cetirizine, the active ingredient ... One to two 5-mg chewable tablets every 24 hours (maximum 10 mg per day) Recommended dose for children ages 2 to 5 and adults 65 and over: One half (2.5 ...

or four tablets (10 mg) once a day, depending on symptom severity. Dosage guidance for Children's Zyrtec Allergy Relief syrup ...