Zyrtec is a powerful antihistamine that contains 10 mg of the active ingredient cetirizine. It offers effective relief from allergy symptoms such as sneezing, runny nose, and itchy or watery eyes, often associated with colds or allergic reactions. Known for its reliability, Zyrtec is marketed globally under several brand variants like Cetiriz, Alleroff, and Aller-Tec, making it a trusted choice for managing seasonal and perennial allergies.