Da Chai Hu Tang has the efficacy and effect of conciliating Shaoyang (treating exogenous fever with evil between half-expression and half-li) and internally removing heat knot. Da Chaihu Tang is mostly used to treat Shaoyang-Yangming Syndrome, which is characterized by cold and heat, bitter fullness in the chest and ribs, vomiting, depression and slight annoyance, hardness or fullness of pain in the lower part of the heart, constipation of the bowels, or dyspepsia with heat in the bowels, yellow tongue coating, and stringy and strong pulse. Da Chai Hu Tang is composed of Chai Hu, Scutellaria baicalensis, Paeoniae alba, and Semen Xie. Da Chaihu Tang is composed of Xiao Chaihu Tang by removing ginseng and licorice, adding Citrus aurantium and Paeonia lactiflora, and is a combination of Xiao Chaihu Tang and Xiao Chengqi Tang with additions and subtractions, and is a formula that is used for concurrently reconciling and catharticizing. In modern clinical practice, Da Chaihu Tang Pill is mostly used to treat acute pancreatitis, acute cholecystitis, gallstone, gastric and duodenal ulcers and other conditions. For conditions caused by Shaoyang-Yangming Syndrome, it should be used after identification under the guidance of a professional Chinese medicine practitioner.