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Cetirizine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Cetirizine is used to treat cold or allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Cetirizine is also used to treat itching and swelling caused by chronic urticaria (hives). Cetirizine may also be used for purposes not listed in this medication guide.
Zyrtec For Dogs. Zyrtec (Â®) with the active ingredient cetirizine is an antihistamine sometimes used to treat dermatitis, a condition which causes a dogâs skin to become itchy. It can be purchased over-the-counter and is tolerated well by most dogs.his medicine can be given either with or without food. Liquid Dosage: Liquid Zyrtec is no longer being made, if you want a liquid medicine try Childrenâs Aller-Tec Â® . Childrenâs Aller-Tec Â® contains 1 mg/mL cetirizine which means it can be given to your dog at a dosage of 0.5 mL/lb.