Patanol

Olopatadine, sold under the brand name Opatanol among others, is a medication used to decrease the symptoms of allergic conjunctivitis and allergic rhinitis (hay fever).[2] It is used as eye drops or as a nasal spray.[2] The eye drops generally result in an improvement within half an hour.[2] Common side effects include headache, sore throat, eye discomfort, change in taste.[3][2] More significant side effects may... [wikipedia]