Chemical name: Coα-[α-(5,6-Dimethyl-1H-benzoimidazol-1-yl)]-Coβ-methylcobamide.
Molecular formula: C63H91CoN13O14P.
Molecular weight: 1344.38.
Mecobalamin occurs as dark red crystals or a crystalline powder. It is sparingly soluble in water, slightly soluble in ethanol (99.5), and practically insoluble in acetonitrile.
It is degraded/affected by light.
Tablet: Each white tablet contains 500 mcg mecobalamin. (See Table 1.)

Excipients/Inactive Ingredients: It contains carnauba wax, microcrystalline cellulose, titanium oxide, stearic acid, calcium stearate, sucrose, talc, precipitated calcium carbonate, corn starch, lactose, white shellac, hydroxypropylcellulose, pullulan, povidone K30, macrogol 6000 and hydrated silicon dioxide as inactive ingredients.
Injection: Mecobalamin (METHYCOBAL) is a clear, red liquid containing the following ingredients. (See Table 2.)
