Zyrtec PI Page 1 of 8 Australia _____ J&J Pacific 3rd April 2014 1 of 8 Cetirizine, sold under the brand name Zyrtec among others, is a second generation antihistamine used to treat hay fever, dermatitis, and urticaria. It is taken by mouth. Effects generally begin within an hour and last for about a day. The degree of benefit is similar to other antihistamines such as diphenhydramine. Zyrtec Images. What does Zyrtec look like? Note: Multiple pictures are displayed for those medicines available in different strengths, marketed under different brand names and for medicines manufactured by different pharmaceutical companies. Learn about ZYRTEC® Tablets, which can temporarily relieve allergy symptoms caused by indoor or outdoor allergens. Also find dosing and ingredient information. *ZYRTEC ® relieves sneezing, runny nose, itchy, watery eyes, and itching of the nose or throat. † ZYRTEC ® 10 mg starts working at hour 1. Based on first dose on the first day of a 2-day study in 2 pollen chamber studies. Find patient medical information for Zyrtec Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Compare prices and find coupons for Zyrtec (Cetirizine) at more than 60,000 US pharmacies. Save up to 80% instantly! Find answers to frequently asked questions about the different ZYRTEC® allergy products, as well as information about indoor and outdoor allergies. ZYRTEC® allergy medication provides powerful relief from your allergy symptoms. Learn more about 24 hour allergy relief. Zyrtec (cetirizine hydrochloride) is an antihistamine that treats symptoms, such as itching, runny nose, watery eyes, and sneezing from hay fever (allergic rhinitis) and other allergies, such as allergies to molds and dust mites.