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Treats Yangming disease (Yangming disorder) presenting with fever and sweating. This indicates that the heat is dissipating outward, so jaundice will not develop. If there is only sweating on the head, no sweating on the body, and the sweat stops at the neck, accompanied by a desire to drink thin gruel or soup, this signifies stagnant heat in the interior, and jaundice will inevitably occur; this formula is indicated. Additionally, in Shanghan (Cold Damage) disease after seven or eight days, if the body is yellow like an orange peel, urination is difficult, and the abdomen is slightly full, this formula is also indicated.

Yinchen Hao (Herba Artemisiae Scopariae, 6 liang), Zhizi (Fructus Gardeniae, 14 pieces), Dahuang (Radix et Rhizoma Rhei, 2 liang, peeled).

The above three herbs are decocted with one dou of water. First, boil Yinchen Hao until the volume reduces by six sheng. Then add the other two herbs and decoct to obtain three sheng of liquid. Strain the dregs. Divide into three warm doses. Recovery occurs when urination becomes smooth.

Song verse: Two liang of Dahuang and fourteen Zhizi, Yinchen Hao six liang should be boiled early. Yellow body, short urine, slight abdominal fullness, resolving damp-heat via the anterior orifice is the most miraculous method.

Ke Yunbo stated: Both Taiyang disease (Taiyang disorder) and Yangming disease can present with jaundice. However, if there is only head sweating without body sweating, the heat cannot vent outward; if urination is obstructed, the heat cannot drain downward, leading to jaundice. If urination is free and unobstructed, jaundice will not develop. The explanation by Zhang Lingshao is particularly exquisite. (However, the location of the pathogen within the interior differs. The muscles constitute the interior of Taiyang, requiring diaphoresis (inducing sweating); thus, Mahlian Lianqiao Chixiaodou Tang (Mahuang, Forsythia, and Red Bean Decoction) is used. [Note: Ke Yunbo moved this formula to the Taiyang chapter, showing insight, but the original text belongs to Yangming, and canonical texts should not be arbitrarily altered]. The chest and heart region constitute the interior of Taiyang and the exterior of Yangming, requiring cooling to overcome heat; thus, Zhizi Bopi Tang (Gardenia and Phellodendron Bark Decoction) is used, which is a method of clearing fire. The intestines and stomach constitute the interior of Yangming, requiring purgation from within; thus, this formula was established, which is a method of expelling turbidity. Yinchen Hao inherits the color of the North, does not wither in winter, braves frost and snow, and absorbs extensive cold qi; therefore, it can eliminate lingering heat pathogens. It leads Zhizi to open the water source and pairs with Dahuang to regulate gastric excess, causing all internal and external stagnant heat to exit via urination. Abdominal fullness naturally decreases, and the intestines and stomach remain undamaged. This aligns with the method of "drawing out and exhausting." This is the supreme agent for promoting diuresis in Yangming disease. Furthermore, regarding Zhang Zhongjing's treatment of thirst and drinking in Yangming disease, there are three methods: Wuling San (Five-Ling Powder) in the Taiyang chapter induces mild sweating to disperse water qi, which is not applicable here. For severe thirst, irritability, and free urination, Baihu Jia Renshen Tang (White Tiger Plus Ginseng Decoction) clears fire and generates fluids. For floating pulse, fever, and obstructed urination, Zhu Ling Tang (Polyporus Decoction) nourishes yin and promotes diuresis. For obstructed urination with jaundice and abdominal fullness, Yinchen Hao Tang drains heat, allowing the yellow pigment to exit via urine. The pathology and treatment principles are clear. I privately believe that Zhang Zhongjing always uses agents that promote qi transformation for promoting diuresis, and agents of Chengqi Tang (Purgative Decoction) class for promoting defecation, because urination depends on qi transformation. Now, why are Fuling (Poria) and Zhuling (Polyporus) not used for obstructed urination? The text states: "In Yangming disease, if there is much sweating and thirst, Zhu Ling Tang must not be given, because profuse sweating causes dryness in the stomach, and Zhu Ling Tang would further deplete fluids through diuresis." It must be understood that if Zhu Ling Tang is contraindicated for those with profuse sweating and thirst in Yangming disease, then for those without sweating but with thirst, whose fluid reserves are already deficient, its use is even more contraindicated. Here, Yinchen Hao, which pushes out the old and brings forth the new, is the main herb, assisted by Zhizi, which directs downward. Zhi Shi (Immature Bitter Orange) and Houpo (Magnolia Bark) are not used to form a Chengqi Tang, nor is Mangxiao (Mirabilite) used for its harsh purgative action. Thus, Dahuang merely moistens the intestines and drains heat, acting slowly. Therefore, abdominal fullness decreases only after overnight passage. The yellow pigment exits via urine, not via the large intestine. The ingenuity of Zhang Zhongjing's legislative methods is beyond imagination.