Cao Wu has the properties of dispelling wind and dampness (removing wind and dampness from the body), warming the menstruation and relieving pain. It is used for wind-cold-dampness paralysis (wind, cold and dampness invade the body and lead to paralysis of limbs), joint pain, cold pain in the heart and abdomen (the location of the heart and abdomen feels cold and painful), cold hernia and anesthesia to relieve pain. The side effects of Cao Wu are mainly caused by its toxicity, Cao Wu poisoning can occur after the mouth, tongue, limb numbness, nausea and vomiting, diarrhea and abdominal pain, dyspnea, blurred vision, respiratory distress, convulsions, cardiac arrhythmia, urinary and fecal incontinence, shock, and even death. Internal use of Cao Wu is usually used after concoction and under the guidance of a professional physician. Precautions: Pregnant women are prohibited; wine infusion is easy to be poisoned, should be used with caution; should not be used with medicines containing ingredients such as Beimu, Semen, Psidium guajava, Ampelopsis pilosula, smallpox pollen, etc.; if symptoms of poisoning should be as soon as possible to seek medical attention.