In Chinese medicine, there is no “Four Reversible Pills”, it should be Four Reversible San or Four Reversible Soup, the former is mainly used for treating Yang Depression and Syncope (cold limbs due to poor circulation of Yang Qi), and the latter is mainly used for treating Yang Deficiency and Cold Syncope. 1. Si Reverse San: This formula consists of four medicines, namely, Chai Hu, Bai Shao, Hovenia and Glycyrrhiza, which has the function of dispersing heat and dredging the liver and spleen, and is effective in relieving coldness of the hands and feet, abdominal pain, loose diarrhea and loose stools, and sighing, etc., which are due to the loss of liver dispersal and excretion (the function of the liver in dispersing and directing the liver is abnormal), and stagnation of the liver within. It should be used with caution for those who are allergic to the drug and those who suffer from Yang deficiency (unconsciousness, accompanied by cold limbs, even up to the elbows and above the knees). 2. Four Reverse Soup: This formula consists of three medicines: Radix et Rhizoma Polygoni Multiflori, Radix et Rhizoma Glycyrrhizae Praeparatae and Radix et Rhizoma Glycyrrhizae Praeparatae, it has the effect of warming the middle and dispelling cold, restoring the yang and saving the rebelliousness (saving the syncope and unconsciousness by warming and replenishing the yang qi). It should be used with caution for those who are allergic to the drug and those who have heat symptoms in Yin deficiency. The above are the efficacy and main treatment of Si Reverse San and Si Reverse Tang. Clinical use of the drug should be cautious, do not use the drug on your own, please go to the regular hospital for diagnosis and consultation in time to avoid delaying the condition.