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price:10 Cetirizine, commonly marketed under the brand name Zyrtec, is an antihistamine medication used to relieve symptoms associated with allergies.Cetirizine works by blocking the action of histamine, a substance released by the body during an allergic reaction. Histamine is responsible for causing symptoms such as sneezing, itching, runny nose, and watery eyes. By inhibiting histamine, cetirizine helps alleviate these symptoms and provides relief from allergic conditions.etirizine is generally well-tolerated, and most people experience minimal side effects.