Product Description Emedastine Difumarate (Rapimine, Emedastine fumarate) is the difumarate salt form of emedastine, a second generation, selective histamine H1 receptor antagonist with anti-allergic activity. Emadine (emedastine difumarate) is an anti-allergic medication used to treat symptoms of allergic conditions of the eye such as itching. (emedastine difumarate ophthalmic solution) 0.05% is a sterile ophthalmic solution containing emedastine, a relatively selective, H1-receptor antagonist for topical administration to the eyes. Emedastine difumarate is a white, crystalline, water-soluble fine powder with a molecular weight of 534.57. The chemical structure is presented below: Structural Formula: BASIC ANALYSIS Melting Point 149°C Color White-Yellow Quantity 200 mg Formula Weight 534.57 Percent Purity ≥98.0% (HPLC,T) Physical Form Crystalline Powder Chemical Name or Material Emedastine Difumarate