Emedastine Difumarate is primarily used as an antihistamine in the treatment of allergic conjunctivitis. It works by blocking histamine H1 receptors, which helps reduce symptoms such as itching, redness, and swelling of the eyes. The compound is formulated into eye drops for direct application, providing quick relief from discomfort caused by allergens like pollen, dust, or pet dander. Its efficacy and rapid action make it a preferred choice for managing acute allergic eye conditions. Additionally, it is well-tolerated with minimal side effects, making it suitable for both short-term and long-term use in patients with recurring allergies.