Poisoning of Prepared Cao Wu may lead to nausea, vomiting, restlessness, panic and shortness of breath, coma and other symptoms. Cao Wu is hot in nature, pungent and bitter in taste, with great toxicity. It belongs to the heart, kidney, spleen and liver meridians, and has the efficacy of dispelling wind and removing dampness, warming the menstruation and relieving pain, and is commonly used clinically for treating numbness and pain in joints, cold pains in the heart and abdomen, and pain in cold hernias due to the internal invasion of wind-cold and dampness. In addition, the preparation of Cao Wu also has the effect of anesthesia and pain relief. Cao Wu is generally used after the system, after the shelling can reduce the toxicity of raw Cao Wu, raw products are generally not used for internal use. It is contraindicated in cases of yin deficiency and fire exuberance, heat and pain, and pregnant women. It is not suitable to be used together with drugs such as Semen Armeniacae, Psidium Guajava, Baihe and Rhinoceros Horn. The use of this drug should be under the guidance of a professional doctor and should not be used on its own to avoid danger.