“Drain cold” means dispersing cold and dispelling cold in Chinese medicine. Drinking Four Reverses Soup has the reaction of dispersing cold as the symptoms of cold limbs and fear of cold are relieved. Four Reversible Soup is composed of dried ginger, epimedium and licorice, which has the effect of restoring yang and saving reversal (saving fainting and unconsciousness by warming and replenishing yang qi). It is suitable for cold syncope syndrome of heart and kidney yang failure, which is characterized by cold limbs, curling up in the bed with fear of coldness, decline in the spirit of desire to sleep, pallor, abdominal pain and diarrhea and vomiting, etc. When taken effectively, the above symptoms can be relieved. After taking Si Yi Tang effectively, the above symptoms can be relieved, including the obvious symptoms of death of yang such as cold limbs and fear of cold lying down, which can be regarded as the reaction of dispersing cold and dispelling cold. Four Reversals Soup has a pungent and hot nature, the medicine can be stopped after the hands and feet are mild, and should not be taken for a long time to avoid injury to the fluid and depletion of qi, and attention should be paid to those who have true heat and false cold are forbidden to use it. If you want to use Siwei Tang, it is recommended to use the medicine under the guidance of a doctor, do not take it on your own.