Rat nerve growth factor is now formulated as an injection-based solution and is used clinically mainly in the nervous system. It has a certain repair effect on the damage of cerebrovascular system and central nervous system including peripheral nerves. The side effects of rat nerve growth factor injection are relatively few now, and there are no obvious serious side effects under normal dose, as long as the patient’s liver and kidney function is normal, he is no liver and kidney function damage. The more common side effects are mainly local pain at the injection site, which may appear as redness, swelling, pain, or pain in the distal part of the lower limbs. Another is the occasional symptoms, the patient may have transient dizziness, headache, insomnia, but the incidence is very low. If there is no allergy to the ingredients, including normal liver and kidney function, there are no certain side effects to the drug. The main application of this is to pay attention to, as long as not to overdose, are basically tolerated.