1. Chai Hu Tang Family Formulas

1. Chai Hu Tang Family Formulas

Xiao Chaihu Tang is the representative formula for harmonizing Shaoyang, composed of chaihu, huangqin, banxia, dangshen, licorice, ginger, and jujube—seven ingredients in total, primarily treating Shaoyang syndrome, i.e., the semi-exterior, semi-interior syndrome. Clinical manifestations

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Currently experiencing bitter taste in the mouth, dry throat, dizziness, alternating chills and fever, fullness and discomfort in the chest and hypochondria, restlessness and a tendency to vomit, and reluctance to eat.

The pulse is wiry, with a thin white coating on the tongue. From a modern medical perspective, this syndrome is similar to the systemic reactive clinical manifestations of subacute and chronic inflammation; therefore, people often use modified Xiaochaihu Decoction to treat the subacute and chronic phases of cholecystitis, hepatitis, pelvic inflammatory disease, pancreatitis, arthritis, gastritis, and enteritis, frequently achieving satisfactory therapeutic effects. Through flexible modifications, this formula can also be effectively used for symptomatic treatment of other diseases. If there is restlessness in the chest without vomiting, remove Banxia and Dangshen, and add Gualou; if there is thirst, remove Banxia and add Dangshen and Gualou; if there is abdominal pain, remove Huangqin and add Shaoyao; if there is a feeling of fullness and distension under the ribs, remove Dazao and add Muli; if there is palpitations in the heart and difficulty in urination, remove Huangqin and add Fuling; if there is mild external fever but no thirst, remove Dangshen and add Guizhi; if there is cough, remove Dangshen, Dazao, and Shengjiang, and add Wuweizi and Ganjiang. The combination of Xiaochaihu Decoction and Guizhi Decoction is called Chaihu Guizhi Tang, which primarily treats the Shaoshao combined syndrome—namely, the Xiaochaihu Decoction syndrome combined with the Guizhi syndrome—with clinical manifestations such as bitter taste in the mouth, dry throat, dizziness, alternating chills and fever, fullness and discomfort in the chest and hypochondria, restlessness and a tendency to vomit, reluctance to eat, headache, fever, and chills. If Dangshen is removed from Xiaochaihu Decoction and Zhi Shi, Da Huang, and Bai Shao are added, the resulting formula is called Da Chaihu Tang, which treats the Shaoyang-Yangming combined syndrome, with clinical manifestations including bitter taste in the mouth, dry throat, dizziness, alternating chills and fever, fullness and discomfort in the chest and hypochondria, restlessness and a tendency to vomit, reluctance to eat, slight irritability, fullness and pain in the abdomen, constipation, a thick yellow and dry tongue coating, and a strong wiry pulse. If Chuanlianzǐ, Yuanhu, Muxiang, and Pugongying are added to Da Chaihu Tang, the resulting formula is called Compound Da Chaihu Tang (an empirical formula), which can treat acute cholecystitis and perforated peptic ulcers. If Xiaochaihu Decoction is combined with Fuling, Qian Dan, Guizhi, Da Huang, Sheng Longgu, and Sheng Muli, the resulting formula is called Chaihu Jia Longgu Muli Tang, which treats the San Yang combined syndrome characterized by floating yang energy, with clinical manifestations mainly including "after eight or nine days of Shanghan, fullness in the chest, restlessness and fear, delirium, and overall heaviness of the body." If Xiaochaihu Decoction is combined with Zhi Shi, Gualou, and Huanglian, the resulting formula is called Chaihu Xianxiong Tang (from "Popular Treatise on Shanghan"), which treats alternating chills and fever, fullness and oppression in the chest and diaphragm, pain upon palpation, and a yellow tongue coating. If Xiaochaihu Decoction is combined with Cangzhu, Houpu, Chenpi, and Gancao, the resulting formula is called Chai Ping Tang (from "Complete Works of Jingyue"), which treats liver qi stagnation and pain in the hypochondria. If Xiaochaihu Decoction is combined with Mangxiao, the resulting formula is called Chaihu Jia Mangxiao Tang, which treats "Shanghan plus three days, with abdominal fullness and delirium." If Xiaochaihu Decoction removes Banxia, Jiang, and Zao, and adds Guizhi, Ganjiang, Huafen, and Muli, the resulting formula is called Chaihu Guizhi Ganjiang Tang, which treats fullness and slight obstruction in the chest and hypochondria, difficulty in urination, thirst without vomiting, but sweating on the head, and alternating chills and fever.