Fenfluramine mainly acts on the nerve center to suppress appetite for the purpose of weight loss. Studies have proven that long-term or overdose of fenfluramine may cause heart valve diseases. It is mainly used in addition to simple obesity, also can be used for patients suffering from hypertension, diabetes, coronary heart disease and anxiety obese patients, after taking the drug patients are able to adapt to the control of diet, there is a significant effect of reducing fat accumulation. The average abdominal circumference can be reduced by 10cm and the average weight by 6kg after 12 weeks of medication, and the medication should not be taken intermittently during the treatment period.