1. J Allergy Clin Immunol. 2003 Jun;111(6):1244-8. Safety of cetirizine in infants 6 to 11 months of age: a randomized, double-blind, placebo-controlled study. Why is Cetirizine (Zyrtec) used in toddlers and infants? Cetirizine (common brand name Zyrtec) is used as an anti-histamine, so is used mainly for: Available in 4 fl oz. (118 mL) Children’s ZYRTEC® Allergy Syrup, Dye-Free, Sugar-Free Grape also available in 2-pack of 4 fl. oz *Provides relief of sneezing, runny nose, itchy, watery eyes and itchy nose and throat. Use these dosage guides for infants and children younger than 12 years old. Zyrtec (cetirizine) is an antihistamine used for the temporary relief of symptoms due to hay fever or other upper respiratory allergies: ZYRTEC® allergy medication provides powerful relief from your allergy symptoms. Learn more about 24 hour allergy relief. In a 2-year carcinogenicity study in rats, Cetirizine was not carcinogenic at dietary doses up to 20 mg/kg (approximately 15 times the maximum recommended daily oral dose in adults on a mg/m 2 basis, or approximately 7 times the maximum recommended daily oral dose in infants on a mg/m 2 basis). Medscape - Allergic rhinitis, urticaria-specific dosing for Zyrtec (cetirizine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. St. Louis Children’s Hospital provides a cetirizine (Zyrtec) dosage table for children. Find out how much cetirizine medication to give a child based on age. Find out how much cetirizine medication to give a child based on age. Zyrtec is a name brand form of a medication called Cetirizine. This medication is used to help ease the symptoms associated with allergies, such as runny nose and fever. If you suffer from allergies, you may take Zyrtec. Zyrtec for Babies and Toddlers - giving information on dosage and side effects of Cetirizine (zyrtec) in TEENren and infants. This was a prospective, randomized, double-blind, parallel-group study comparing cetirizine with placebo in infants with AD and a family history of atopy.