Rat nerve growth factor is recommended to be applied as early as possible after the diagnosis of nerve injury is established, and it is usually better to inject it in the morning. Rat Nerve Growth Factor is a neuroprotective, neuroregenerative and neurotrophic agent. It is a biologically active protein extracted from the submandibular gland of mice, which can promote the growth and development of nerve cells, and is mainly used for the treatment of optic nerve injury, and is also effective for other peripheral nerve injuries. Mouse Nerve Growth Factor is a dry powder preparation, which is dissolved in 2ml of sodium chloride injection or sterilized water for injection intramuscularly once a day for a course of 10-14 days. Patients are recommended to inject in the morning and take deep intramuscular injection to avoid local formation of hard nodules and redness. In addition, after the injection of rat nerve growth factor, individual patients may experience dizziness, insomnia and other reactions, which can generally disappear after stopping the drug; meanwhile, patients with allergies should use this drug with caution, and it is recommended to follow the doctor’s instruction.