The prescription ingredients of Si Reverse Tang and Tong Wei Si Reverse Tang are the same, both are licorice, appendicia and dry ginger, the difference is that Tong Wei Si Reverse Tang doubles the use of dry ginger and reuses appendicia. 1. The difference between Tong Wei Si Reverse Tang and Tong Wei Si Reverse Tang lies in the difference in the amount of medicines, doubling the use of dry ginger, heavy use of epiphyllum, therefore, warming the yang and driving away cold (warming yang qi, dispelling the cold) is stronger, and there is a breakthrough of yin and return to the yang, through the internal and external functions. It is mainly used for treating yang deficiency and yin-excessive yang syndromes. It is used for treating cold entering the foot-shaoyin kidney meridian, deficiency of kidney yang (lack of yang energy in the kidneys) with symptoms such as diarrhea and purgation (stools that are as clear and thin as water or mixed with indigestible food), coldness of the hands and feet and pain in the abdomen, as well as yin-excessive yang syndromes with symptoms of internal cold and external heat, redness of the face, sweating and syncope, etc., which are caused by yin-excessive yin, and desire to detach the true Yang. This product should not be taken by people without fever. 2. Si Reverse Soup has the effect of warming the middle and dispelling cold, restoring yang to save the body (saving fainting and unconsciousness by warming yang qi). It is mainly used for the treatment of symptoms such as yang deficiency, cold sweat, fainting (unconsciousness with cold limbs, even to the elbows and above the knees), diarrhea and clearing of grain, and weak pulse. Damp-heat body or Yin deficiency and fire (deficiency of Yin and essence in the body, resulting in hyperactivity of deficiency and fire) people, and people with weak physique are not suitable to consume Si-Yi Tang. Patients should take the medication under the guidance of a Chinese medicine practitioner and follow the doctor’s instructions, and should not take the medication on their own.