Cobalamin tablets should be methylcobalamin tablets and can be taken one and a half tablets at a time, but need to be under the supervision of a doctor. Methylcobalamin tablets are a kind of drugs that nourish peripheral nerves, commonly used in the treatment of peripheral neuropathy. The general use of oral, adults once a tablet, 3 times a day, different age, different symptoms of patients taking different doses, some patients can eat one and a half at a time, the specific use of dosage need to follow the doctor’s instructions. The main ingredient of methylcobalamin tablets is methylcobalamin, patients who are allergic to methylcobalamin are prohibited from using this drug; staff engaged in mercury and its compounds, should not take a large amount of long-term use of this product. Some patients taking this drug may experience adverse reactions such as nausea, vomiting and diarrhea, which aggravate the neurological symptoms. Discomfort should immediately seek medical attention to avoid aggravation of the condition.