Get 24-hour relief from allergy symptoms caused by ragweed, tree pollen, dust mites, pet dander hay fever & other upper respiratory allergies with Zyrtec Allergy Relief Medicine Tablets. With 10 milligrams of the antihistamine cetirizine hydrochloride per tablet, this prescription-strength allergy medicine provides 24 hours of relief from common symptoms of allergies including runny nose, sneezing, itchy, watery eyes, & itching of the nose or throat. From the #1 allergist-recommended brand among OTC oral antihistamines, these all-day anti-allergy tablets with cetirizine HCl effectively treat indoor allergies caused by dust, mold, & pet dander, as well as outdoor seasonal allergies from tree pollen, weeds, & grasses. Zyrtec anti-allergy tablets start working fast at hour one & provide 24 hour relief of your indoor & outdoor allergies & work twice as