The price of a box of Four Reversible San is approximately between 40 yuan and 100 yuan. Affected by different distribution channels, different drug specifications, different regions and cities and other factors, the specific price has a large difference, it is recommended to go to the regular medical institutions or regular pharmacies to consult. Sihui San is a proprietary Chinese medicine, composed of Chaihu, Citrus aurantium, licorice and so on. In the formula, Chaihu has the efficacy of elevating yang qi, dredging the liver and relieving depression (treating depression by dredging the liver qi), and is the monarch; Bai Shao has the efficacy of astringing yin, nourishing the blood and softening the liver (tonifying the blood and softening the liver); and Licorice has the efficacy of regulating all medicines (regulating the properties of different traditional Chinese medicines), benefiting the spleen and neutralizing the middle. The combination of these herbs has the effect of dispersing stagnant heat, dredging the liver and regulating the spleen. Si Reverse San is used in treating chills in the limbs due to fever, epigastric and coercive pain, dysentery and diarrhea. Adverse effects, contraindications and precautions of Si-Yi San are not clear at present. If there is a need for medication, it should be used under the guidance of a traditional Chinese medicine practitioner, and should not be used blindly on its own, so as not to cause adverse effects on the body.