Si Mo Tang is effective in promoting the movement of Qi to lower the rebellious Qi and relaxing the chest to disperse knots, and is indicated for treating the syndrome of Liver-Qi stagnation. Si Mo Tang has the efficacy of moving qi and lowering rebelliousness (promoting the downward movement of upwardly rebellious qi), and relieving the chest and dispersing lumps (relieving lumps of qi in the chest). It is used in treating the syndrome of Liver-Qi stagnation (poor transportation of Qi and blood in the liver, emotional depression), which is characterized by distension and congestion in the chest and diaphragm, fullness in the lower part of the heart, and inability to think about food and drink. In this formula, Wu Yao is used to relieve the liver of depression (treating depression by unblocking the liver’s qi), Shen Xiang to lower qi and reduce rebelliousness, and betel nut to move qi and guide stagnation, together as the subject medicine. Ginseng is also used as an adjuvant in the formula. The adverse effects of Si Mu Tang are not clear, and it is contraindicated in pregnant women, intestinal obstruction, intestinal tumors, and postoperative gastrointestinal patients. If you need to use the medicine, it is recommended to use it under the guidance of a Chinese medicine practitioner, unauthorized use of medicine may cause adverse consequences.