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Methycobal also contains the following inactive ingredients: Tablet: Carnauba wax, microcrystalline cellulose, titanium oxide, stearic acid, calcium stearate, sucrose, talc, precipitated calcium carbonate, corn starch, lactose hydrate, white shellac, hydroxypropylcellulose, pullulan, povidone, macrogol 6000 and hydrated silicon dioxide.
Ampoule: D-mannitol 50 mg as an additive and distilled water for injection. It has a pH 5.3-7.3 and osmotic pressure (to physiological saline) of approximately 1.
Mecobalamin is Coα-[α-(5,6-Dimethylbenz-1H-imidazolyl)]-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 affected by light.
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