Methylcobalamin is not a murine nerve growth factor. Methylcobalamin is an endogenous coenzyme B12, which can promote axonal transport function and axonal regeneration, lecithin synthesis and neuronal myelin sheath formation, and is usually used in the treatment of peripheral neuropathies, and can also be used in the treatment of megaloblastic anemia caused by vitamin B12 deficiency. Some patients may experience adverse reactions such as decreased blood pressure, dyspnea, rash, headache, muscle stiffness, feverish sensation, etc. after using methylcobalamin, which need to be stopped in time for rescue, and is contraindicated for patients who are allergic to the components of this product, and if it is not effective after one month of use, it is recommended to consult a doctor to change the treatment. Mouse nerve growth factor is a nerve growth factor extracted and purified from the submandibular gland of mice, which can improve the limb motor dysfunction due to toxic peripheral neuropathy caused by hexanedione and acrylamide. It has the effect of reducing the incidence of myelin swelling and decreasing the number of degenerated tibial nerve fibers in animal tibial nerves. It has the effect of promoting the recovery of damaged nerves. It is contraindicated in patients who are allergic to the components of this product. Patients are advised to use the drug in strict compliance with medical advice, and if it is necessary to use it simultaneously with other drugs, consult a physician in advance.