Zyrtec is a medication that prevents allergies. Zyrtec 10 mg film-coated tablets are prescribed for the following purposes in adults and children starting at age 6: - to relieve the eye and nasal symptoms of seasonal or aperiodic allergic rhinitis. - to alleviate urticaria. Always take this medication exactly as prescribed by your physician or pharmacist, or as detailed in this leaflet. If in doubt, see your physician or pharmacist.