The question of how many injections of rat nerve a course of treatment cannot be generalized, but needs to be specifically analyzed according to the degree and type of the disease and the degree of recovery of the patient. Rat nerve growth factor should be injected one at a time, diluted with 2 ml of saline 1 time / day, if mild peripheral neuritis patients, usually 2 weeks as a course of treatment, that is, through 14 injections, you can complete a course of treatment. However, for acute cerebrovascular diseases, such as limb movement disorders due to acute stroke, or acute cerebrovascular diseases due to cerebral hemorrhage or cerebral embolism, at least 4 weeks of treatment is required as a course of therapy. For toxic diseases such as adverse gas poisoning, chemical poisoning, etc., rat nerve growth factor 8 weeks as a course of treatment.