Methylcobalamin tablets are not usually used for repairing central nerves, and the drug is mainly used for peripheral nerve diseases. Mecobalamin tablets are endogenous coenzyme B12, usually used in the treatment of peripheral neuropathy, can promote axonal transport function and axonal regeneration, promote lecithin synthesis and neuronal myelin formation, but there is no research data to prove the effect of this drug on the repair of central nervous system. Some patients may experience loss of appetite, nausea, vomiting, diarrhea, rash and other adverse reactions after using methylcobalamin tablets, the drug is prohibited for patients who are allergic to the components of the product, patients with uncomfortable symptoms, it is recommended to go to the hospital in a timely manner, and use the medication under the guidance of a physician strictly, and if it is necessary to use it together with other medications, you can consult with a physician in advance.