Lei Gong Teng is poisonous, internal use should be carried out carefully under the guidance of a doctor, in the use of the dosage should be small (1 ~ 3g), need to be decocted first for a long time (at least 1 hour of decoction on a gentle fire), the use of time should not be too long. Lei Gong Teng is the xylem of the root of Lei Gong Teng, a plant in the family of Wesleyanaceae. Because the drug can serve to dispel wind and dampness (get rid of wind and dampness in the body), activate blood circulation, reduce swelling and relieve pain (eliminate swelling and pain), it can be used to treat joints that are red, swollen, hot and painful due to externally induced wind-dampness-heat, swelling that is difficult to go away, morning stiffness, functional limitation, and even deformation of the joints. In addition, Lei Gong Teng can also kill insects and detoxify toxins, and can also be used to treat leprosy, stubborn ringworm, eczema, scabies and other diseases. However, because of the high toxicity of the drug, it needs to be decocted for a long time when taken internally and the dosage should be small to minimize the toxicity. Even when used externally, the medication should not be used for more than half an hour. It should be taken with caution by those who have organic lesions of the heart, liver, kidney and leukopenia. Pregnant women should be prohibited from taking it. The specific medication should follow the doctor’s instructions.