Olopatadine acts as an anti-allergic, belonging to the group of H1 receptor blockers and mast cell membrane stabilizers. Therefore, in clinical practice, this drug is mainly used in the treatment of allergic diseases. Depending on the dosage form, it corresponds to the treatment of different diseases. Olopatadine tablets and capsules can be taken orally to treat urticaria, allergic rhinitis, and some scratchy skin diseases. While the eye drop form can be used to treat allergic conjunctivitis. Note that Olopatadine can have adverse reactions such as drowsiness, abnormal liver function, thirst, etc. During the use of the drug, if any of the above mentioned abnormalities occur, you need to stop the drug immediately and seek proper medical attention.