Used primarily in ophthalmic solutions to treat symptoms of allergic conjunctivitis, such as itching, redness, and swelling of the eyes. It functions as a selective H1 receptor antagonist and also stabilizes mast cells, preventing the release of histamine and other mediators of allergic reactions. Commonly found in eye drops, it provides relief from seasonal and perennial allergic eye conditions. Some formulations are also used as nasal sprays to alleviate nasal symptoms of allergies, including sneezing, itching, and runny nose. Its dual mechanism of action makes it effective for both acute and chronic allergy management with minimal side effects.