Biopat Eye drop is an anti-allergic medicine. Biopat eye drops contain olopatadine as its active ingredient. It is effective in treating allergic conjunctivitis (symptoms include redness, itching, watery eyes, etc). You need to use this medicine as advised by the doctor. Do not use this medicine if you are allergic to it. You should remove your contact lenses before using these eye drops. Avoid contaminating the tip of the eye drop. Before using this medicine, please discuss with your doctor if you have any other eye conditions.