Olopatadine is a medication used decrease the symptoms of allergic conjunctivitis and allergic rhinitis. It is used as eye drops or as a nasal spray. The eye drops general result in an improvement within half an hour. Common side effects include headache, sore throat, eye discomfort, change in taste.
Olopatadine HCL Drops. … This medication is an antihistamine used to treat itching and redness in the eyes due to allergies. … Apply this medication in the affected eye(s) usually once or twice a day as directed by your doctor, depending on the brand of eye drops you are prescribed.