Epinastine is primarily used in the treatment of allergic conjunctivitis, providing relief from symptoms such as redness, itching, and swelling of the eyes. It functions as an antihistamine and mast cell stabilizer, effectively reducing the release of histamines and other inflammatory substances that cause allergic reactions.

In ophthalmology, epinastine is available as eye drops, making it convenient for direct application to the affected area. It is particularly valued for its dual mechanism of action, which not only alleviates existing symptoms but also helps prevent their recurrence.

Additionally, epinastine is known for its rapid onset of action and long-lasting effects, often requiring only twice-daily administration. Its safety profile and minimal side effects make it a suitable option for both adults and children suffering from eye allergies.

Beyond its primary use, epinastine has also been explored for potential applications in other allergic conditions, though its use remains predominantly focused on ocular allergies.