Mycobal 500mcg Tablet is a supplement of vitamin B12. Vitamin B12 is important for the brain and nerves, and for the production of red blood cells. This medicine is used to treat vitamin B12 deficiency. It is also sometimes used in people with pernicious anemia and other conditions. Mycobal 500mcg Tablet should be taken in dosage and duration as advised by the doctor. The dosage should not be exceeded without the consultation of a doctor. Inform your doctor if you are taking any other medicines. Common side effects of this medicine include nausea, vomiting, diarrhea, loss of appetite, and headache. If any of this bothers you, you should let your doctor know. before taking this medicine, let your doctor if you have any preexisting medical condition. Let your doctor also know about all the medicines you are taking.