Olopatadine belongs to a group of medicines called antihistamines. It is used in the treatment of various allergic conditions. It relieves symptoms like itching, swelling, and rashes. Olopatadine should be taken with or without food. The dose may vary depending on what you are taking it for. Take it as it has been prescribed by your doctor. You may need this medicine only on days you have symptoms, or you may need to take it every day to prevent symptoms from happening. If you stop taking it earlier than advised, your symptoms may come back. This medicine is generally very safe.