Methylcobalamin tablets are mainly used to treat various neuritis pains and diabetic retinopathy in human body, which are very effective in repairing, relieving and treating patients’ nerve pain and numbness. Methylcobalamin tablets are also vitamin B12, which can be directly absorbed and utilized by the human body. According to a large number of clinical phenomena, patients who take methylcobalamin will have adverse reactions such as loss of appetite, nausea, diarrhea, etc. Patients who are allergic to methylcobalamin may have rashes after taking it. Therefore, patients should not use the drug without authorization, and must follow the doctor’s medical advice to use the drug rationally. If the patient has not been relieved after using this drug for one month, do not continue to take it, but go to the hospital to consult a doctor or pharmacist for a change of drug regimen.