Itchy Eyes? Meet the Invisible Enemies. Did you know there are thousands of allergens in every cubic yard of air? Pollen, ragweed, and grass are the triggers we might think of first. But you don't have to set foot outdoors to have your day ruined by itchy allergy eyes. Pet dander and animal hair are among the most common indoor allergens. That's why there's Pataday. Pataday is made to relieve the itch caused by these everyday culprits —both indoor and out. About Pataday Prescription strength Pataday features the ingredient doctors prescribe most for itchy allergy eyes. And now, no prescription is needed. How does Pataday work? Pataday works two ways. It goes to work on mast cells in the eye. (Mast cells house the histamines that make your eyes itch.) Pataday stabilizes the mast cells, preventing them from releasing histamines. Pataday also blocks histamines that have already been released from attaching to the histamine (H1) receptors in the eye, breaking the chain of allergic reaction. Less histamines means less allergy eye itch Pataday Twice Daily Relief, formerly known as Patanol, with a 0.1% concentration. This higher concentration provides longer –lasting eye allergy itch relief. 1 Doctor-Prescribed Eye Allergy Itch Relief Ingredient. Twice Daily Relief Pataday Twice Daily Relief: Put 1 drop in the affected eye(s) every 6 to 8 hours, no more than twice per day. Available without a prescription Works in minutes Active ingredient: Olopatadine (0.1%) Temporarily relieves itchy eyes due to pollen Temporarily relieves itchy eyes due to ragweed Temporarily relieves itchy eyes due to grass Temporarily relieves itchy eyes due to animal hair Temporarily relieves itchy eyes due to dander For external use only Only for use in the eye Remove contact lenses before using Pataday, then wait at least 10 minutes before reinserting lenses. Available for purchase without having to visit a healthcare professional. Active Ingredients: Olopatadine (0.1%) (Equivalent to Olopatadine Hydrochloride 0.111%). Purpose: Antihistamine and Redness Reliever. Inactive Ingredients: Benzalkonium chloride 0.01%, dibasic sodium phosphate, sodium chloride, hydrochloric acid/sodium hydroxide (adjust pH), and purified water. Suggested Use: Adults and children 2 years of age and older: Put 1 drop in the affected eye(s) twice daily, every 6 to 8 hours, no more than twice per day Children under 2 years of age: Consult a doctor Do not use: - if solution changes color or becomes cloudy UPC: 300654274018 Weight: 0.38 lbs