Zyrtec (Cetirizine) is an over-the-counter antihistamine used to treat cold and allergy symptoms such as sneezing, itching, watery eyes, or runny nose.Adults and children 12 years and over should take 1 tablet of Zyrtec-D every 12 hours and not more than 2 tabletsCetirizine 5 mg-MYL, white, round...