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Cetirizine is an antihistamine designed to alleviate allergy symptoms including watery eyes, a runny nose, itching in the eyes or nose, sneezing, hives, and general itching. It functions by blocking histamine, a natural substance produced by the body during an allergic reaction. However, it is important to note that Cetirizine does not prevent hives or treat serious allergic reactions like anaphylaxis. If you have been prescribed an epinephrine injector for allergic emergencies, ensure you carry it with you at all times and do not substitute cetirizine for epinephrine.