EMADINE† (emedastine difumarate ophthalmic solution) 0.05% is a sterile ophthalmic solution containing emedastine, a relatively selective, H ₁ -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:

1H-Benzimidazole, 1-(2-ethoxyethyl)-2-(hexahydro-4-methyl-1H-1,4-diazepin-1-yl), (E)-2-butenedioate (1:2)

Each mL of EMADINE contains:  Active: 0.884 mg emedastine difumarate equivalent to 0.5 mg emedastine. Preservative: benzalkonium chloride 0.01%. Inactives: Tromethamine; sodium chloride; hydroxypropyl methylcellulose; hydrochloric acid/sodium hydroxide (adjust pH); and purified water. It has a pH of approximately 7.4 and an osmolality of approximately 300 mOsm/kg.

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