Strychnine is a kind of traditional Chinese medicine used to treat rheumatism and bruises with toxicity, also known as fengshui, is the dried, mature seeds of the plant strychnine of the family Equisetaceae into medicine, the efficacy and function is to disperse knots and swellings, pass through the channels and relieve pain, treat carbuncles and swellings, bruises and bruises, rheumatism and stubborn paralysis, constriction. Clinically, it is used to treat two kinds of diseases: carbuncles and swelling, bruises and injuries, and paralysis and numbness caused by rheumatism. The use of strychnine, when taken internally into pills and dispersed externally must be ground into a fine powder and applied to the affected area, strychnine poisonous main toxic components are seneciphylline, strychnine, overdose can lead to limb tremors, convulsions, increased blood pressure, respiratory distress, and even coma. Therefore, the dosage must be strictly controlled, forbidden to take more, for a long time, must be concocted before internal use, strictly forbidden to use raw otherwise toxic ingredients can be absorbed through the skin, so external use can not be a large area of long-term application.