This medicine contains hydroxocobalamin which is a form of Vitamin B12. Vitamin B12 contains cobalt. Hydroxocobalamin is given for: • Addisonian pernicious anaemia (caused when absorption of Vitamin B12 from the stomach is reduced). • Tobacco amblyopia (poor sight caused by toxins such as tobacco). • Leber’s atrophy (degeneration of the optic nerve resulting in loss of central vision). • Treatment/prevention of other macrocytic anaemias due to deficiency in vitamin B12. Hydroxocobalamin is given for: • Addisonian pernicious anaemia (caused when absorption of Vitamin B12 from the stomach is reduced). • Tobacco amblyopia (poor sight caused by toxins such as tobacco). • Leber’s atrophy (degeneration of the optic nerve resulting in loss of central vision). • Treatment/prevention of other macrocytic anaemias due to deficiency in vitamin B12. Vitamin B12 is needed for physical growth and development and for the formation of red blood cells in the bone marrow. It is also required for absorption of folic acid and carbohydrates from food and for keeping the nerve (neurological) system healthy.