Vitamin B12
Vitamin B12 Cyanocobalamin Injection is a sterile solution
of cyanocobalamin for intramuscular or subcutaneous injection.
Each mL contains 500 mcg cyanocobalamin.
Each vial also contains sodium chloride, 0.9%. Benzyl alcohol,
1.5%, is present as a preservative. Sodium hydroxide and/or
hydrochloric acid may have been added during manufacture to
adjust the pH (range 4.5-7.0).
Cyanocobalamin appears as dark red crystals or as an amorphous
or crystalline red powder. It is very hygroscopic in the anhydrous
form, and sparingly soluble in water (1:80). It is stable
to autoclaving for short periods at 121° C. The vitamin
B12 coenzymes are very unstable in light.
The chemical name is 5,6-dimethyl-benzimidazolyl cyanocobamide;
the molecular formula is C63H88CON14O14P. The cobalt content
is 4.34%. The molecular weight is 1355.39.
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