Mecobal OD Tablet belongs to the class of 'vitamins', primarily used to treat vitamin b12 deficiency and peripheral neuropathy (nerve damage in the hands and feet). It is also used to prevent/treat megaloblastic anaemia (anaemia with unusually large red blood cells). Vitamin B12 deficiency occurs when the body has lower levels of vitamin B12 than normal. Symptoms include fatigue, breathlessness, numbness, poor balance, and memory trouble.