Pataday (
olopatadine) is used to treat 
allergic conjunctivitis. Pataday is an 
antihistamine which works by blocking the effects of histamines to treat allergy symptoms. It is available as a 0.2% 2.5ml vial. Pataday is available as a brand and generic. It is covered by some Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower.
Get Olopatadine for as low as $11.11, which is 79% off the average retail price of $54.01 for the most common version, by using a GoodRx coupon.