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Treats Sanjiao (Triple Burner) excess heat and all types of surplus fire syndromes accompanied by constipation.
Huangqin (Scutellariae Radix), Dahuang (Rhei Radix et Rhizoma) in equal parts, Huanglian (Coptidis Rhizoma) decocted in water for oral administration.

Treats hyperactive fire in the Upper Jiao (Upper Burner), resulting in severe swelling of the head and face, redness and painful swelling of the eyes, excessive heat in the chest, heart, throat, mouth, tongue, ears, and nose, as well as the formation of sores and toxins.
Huangqin (Scutellariae Radix), Huanglian (Coptidis Rhizoma), Gancao (Glycyrrhizae Radix et Rhizoma) in equal parts, decocted in water, taken after meals.
[Note] In Sanhuang Tang (Three-Yellow Decoction), Huangqin (Scutellariae Radix) clears fire from the Upper Jiao (Upper Burner), Huanglian (Coptidis Rhizoma) clears fire from the Middle Jiao (Middle Burner), and Dahuang (Rhei Radix et Rhizoma) clears fire from the Lower Jiao (Lower Burner). For patients with Sanjiao (Triple Burner) excess fire and solid stools, this is indeed appropriate. If the stools are not hard or dry, it belongs to the syndrome of Huanglian Jiedu Tang (Coptis Decoction for Detoxification). Replacing Dahuang (Rhei Radix et Rhizoma) with Huangbai (Phellodendri Cortex) is because the heat accumulation in the Lower Jiao (Lower Burner) has not yet become solid. Adding Zhizi (Gardeniae Fructus) allows the heat to exit via urination rather than defecation. For excess fire in the Upper and Middle Jiao (Upper and Middle Burners), Liangge San (Cooling the Diaphragm Powder) is used. If it is excess fire solely in the Upper Jiao (Upper Burner), replace Dahuang (Rhei Radix et Rhizoma) in this formula with Gancao (Glycyrrhizae Radix et Rhizoma), naming it Erhuang Tang (Two-Yellow Decoction). This allows the properties of Huangqin (Scutellariae Radix) and Huanglian (Coptidis Rhizoma) to descend slowly and linger above the diaphragm. Zhang Jiegu (Zhang Yuansu) reduced Mangxiao (Natrii Sulfas) and Dahuang (Rhei Radix et Rhizoma) in Liangge San (Cooling the Diaphragm Powder) and added Jiegeng (Platycodonis Radix), which follows the same principle. Although these are all formulas for purging fire, their differences regarding the upper, middle, and lower regions, as well as their speed and intensity, represent methods of modification and transformation that must be understood.

Treats Yang syndromes of Shanghan (Cold Damage), characterized by severe heat in both the exterior and interior without sweating. Or, after having undergone sweating or purgative treatments, the pathogen remains unresolved after passing through meridians, with surging and rapid pulses in all six positions, red face, dry nose, dry tongue with extreme thirst, irritability, insomnia, delirium, epistaxis, jaundice, rash, or macules. For all the above syndromes, provided there is exterior excess with no sweat and the pathogen has not entered the interior to form a solid condition, this formula is indicated.
Shigao (Gypsum Fibrosum) 1.5 liang, Huangqin (Scutellariae Radix), Huanglian (Coptidis Rhizoma), Huangbai (Phellodendri Cortex), Mahuang (Ephedrae Herba) each 7 qian, Danshichi (Sojae Semen Praeparatum) 2 he, Zhizi (Gardeniae Fructus) 30 pieces. Each dose is 1 liang, add 3 stalks of Congbai (Allii Fistulosi Bulbus), decocted in water, taken hot. Patients with strong constitution should take double doses.
[Note] Zhang Zhongjing established methods for simultaneous resolution of exterior and interior for severe heat: For example, Daqinglong Tang (Major Blue Dragon Decoction) treats severe heat in both exterior and interior; since the exterior is excess with no sweat, it induces sweating, allowing both exterior and interior to resolve upon sweating; Baihu Tang (White Tiger Decoction) treats severe heat in both exterior and interior; since there is sweat at the exterior, it does not use Mahuang (Ephedrae Herba) or Guizhi (Cinnamomi Ramulus); since the interior is not solid, it does not use Mangxiao (Natrii Sulfas) or Dahuang (Rhei Radix et Rhizoma). It only uses Shigao (Gypsum Fibrosum), Zhimu (Anemarrhenae Rhizoma), and Gancao (Glycyrrhizae Radix et Rhizoma) to externally clear heat from the muscles of the Yangming channel and internally clear heat from the fu organs of the Yangming channel, achieving resolution of both exterior and interior. However, for cases of exterior excess with no sweat, heat stagnating in Ying (Nutrient) and Wei (Defensive) levels, interior not yet solid, heat flourishing in the Sanjiao (Triple Burner), representing severe heat in both exterior and interior: if treated with Daqinglong Tang (Major Blue Dragon Decoction) for simultaneous resolution, its efficacy does not reach the Sanjiao (Triple Burner); if treated with Baihu Tang (White Tiger Decoction) for simultaneous resolution, its efficacy does not reach the Ying (Nutrient) and Wei (Defensive) levels. Therefore, Tao Hua formulated this decoction: using Sanhuang (the three yellows: Huangqin, Huanglian, Huangbai) to purge the flourishing fire of the Sanjiao (Triple Burner), assisted by Zhizi (Gardeniae Fructus) to descend curvingly, allowing internal heat to exit downward. Using Mahuang (Ephedrae Herba) to open the heat stagnation in Ying (Nutrient) and Wei (Defensive) levels. Assisted by Danshichi (Sojae Semen Praeparatum) and Congbai (Allii Fistulosi Bulbus) to act directly on the skin and hair, allowing external pathogens to dissipate outward. Shigao (Gypsum Fibrosum) is used in heavy dosage as a key ingredient because, combined externally with Mahuang (Ephedrae Herba) and Danshichi (Sojae Semen Praeparatum), it follows the pattern of Qinglong (Blue Dragon), indicating that resolving various exterior heats cannot go beyond the scope of Qinglong. Internally combining with Sanhuang (the three yellows), it follows the pattern of Baihu (White Tiger), indicating that resolving various interior heats cannot go beyond the scope of Baihu. Moreover, Mahuang (Ephedrae Herba) and Danshichi (Sojae Semen Praeparatum) obtain Shigao (Gypsum Fibrosum) and Sanhuang (the three yellows) to vigorously release exterior heat without disturbing interior heat; Sanhuang (the three yellows) obtains Shigao (Gypsum Fibrosum), Mahuang (Ephedrae Herba), and Danshichi (Sojae Semen Praeparatum) to vigorously clear internal heat without hindering the dispersal of external pathogens. Thus, this formula excels in treating heat in both exterior and interior and also captures the essence of Zhang Zhongjing’s methodology. If there is slight sweating at the exterior, reduce Mahuang (Ephedrae Herba) by half and double Guizhi (Cinnamomi Ramulus) to prevent excessive dispersion of the exterior; if there is slight loose stool in the interior, remove Shigao (Gypsum Fibrosum) and double Gegen (Puerariae Lobatae Radix) to avoid deficiency in the middle jiao.