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Addisonian pernicious anaemia, Congenital cobalamine malabsorption, Congenital intrinsic factor deficiency, Homocystenemia, Ileal resection, Methylmalonylacidurias, Nutrition deficiency, Post gastrectomy vit B-12 deficiency, Transcobalamin II deficiency, and can also be given in adjunctive therapy as an alternative drug of choice in Vitamin-B12 defeciency of dietary origin.

How it works

Vitamin B12 is used in the body in two forms: Methylcobalamin and 5-deoxyadenosyl cobalamin. The enzyme methionine synthase needs methylcobalamin as a cofactor. This enzyme is involved in the conversion of the amino acid homocysteine into methionine. Methionine in turn is required for DNA methylation. 5-Deoxyadenosyl cobalamin is a cofactor needed by the enzyme that converts L-methylmalonyl-CoA to succinyl-CoA. This conversion is an important step in the extraction of energy from proteins and fats. Furthermore, succinyl CoA is necessary for the production of hemoglobin, the substances that carries oxygen in red blood cells.

Common side effects

Bronchospasm, Shortness of breath, Hypersensitivity reaction, Shivering, Urticaria


Content on this page was last updated on 28 September, 2016, by Dr. Varun Gupta (MD Pharmacology)