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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, also known as Cetirizine, serves as a histamine blocker and keeps pets from sneezing, coughing and tearing when the weather changes. Some veterinarians also use it to combat food allergies. Before giving this product to an animal, it is important to consult with the dog's veterinarian for the correct dosage.