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(From Zhang Jiebin's *Xin Fang Ba Zhen*) Treats cold damage (Shanghan) with yin-summerheat, where the pathogenic factor cannot be dispersed. This is a modified formula of Mahuang Tang (Ephedra Decoction) and Guizhi Tang (Cinnamon Twig Decoction).

Guigui (Cinnamomi Cortex, 1-2 qian) Mahuang (Ephedrae Herba, 2-3 qian) Danggui (Angelicae Sinensis Radix, 3-4 qian) Gancao (Glycyrrhizae Radix et Rhizoma, 1 qian) Chenpi (Citri Reticulatae Pericarpium, use as appropriate or omit) Shengjiang (Zingiberis Rhizoma Recens, 5-7 slices or 10 slices) Use one zhong and a half of water, decoct to eight-tenths, remove the floating foam, take at any time. If the primordial qi is severely deficient and the yin pathogen is difficult to resolve, it should be used alternately with Dawenzhong Yin (Great Warming Middle Decoction).

[Appendix] Dawenzhong Yin (Great Warming Middle Decoction) (From Zhang Jiebin's *Xin Fang Ba Zhen*) Treats yang-deficient cold damage; and all conditions of fatigue-induced cold epidemic in the four seasons, where the body is feverish but still fears cold, even in summer months desiring clothing and blankets for coverage, or preferring hot drinks, or accompanied by vomiting and diarrhea, provided the six pulses are powerless. This indicates severe deficiency of primordial yang, where righteous qi cannot overcome the pathogen, manifesting as "warming the middle can dispel cold," which refers to this formula.

Shudi (Rehmanniae Radix Praeparata, 3-5-7 qian) Renshen (Ginseng Radix, 2-5-7 qian, up to 1 liang for severe cases, or may be omitted) Rougui (Cinnamomi Cortex, 1-2 qian) Baizhu (Atractylodis Macrocephalae Rhizoma, 3-5 qian) Danggui (Angelicae Sinensis Radix, 3-5 qian; not suitable if diarrhea is present, or replace with Shanyao/Dioscoreae Rhizoma) Chaihu (Bupleuri Radix, 2-3-4 qian) Mahuang (Ephedrae Herba, 1-2-3 qian) Zhigancao (Prepared Glycyrrhizae Radix et Rhizoma, 1 qian)
Ganjiang (Zingiberis Rhizoma, stir-fried until cooked, 1-2 qian, or use Wei Shengjiang/Stewed Ginger, 3-5-7 slices) Use two zhongs of water, decoct to seven-tenths, remove the floating foam, take warm, or slightly cover to induce slight sweating. (If qi deficiency is severe, add Huangqi/Astragali Radix, 2-3 qian. If cold is severe and yang is deficient, add Fuzi/Aconiti Lateralis Radix Praeparata, 1-2 qian. Note: Chaihu and Shudi in this formula do not align with the principle of warming the middle; they are not suitable for those with vomiting, nausea, and diarrhea. They must be used together with Fuzi to avoid being cold and stagnant.)

Mahuang Guijia Yin contains Danggui, Gancao, and Chenpi; decoct with Shengjiang and take to induce moist sweat. (The goal is only to achieve slight, moist sweating.) For cold damage with yin-summerheat where the pathogen is hard to disperse, using this formula yields excellent results. (Xu Gao notes: This is also a modified formula of Mahuang Tang and Guizhi Tang, more accurate in intent than Haizang Shen Zhu San. The inclusion of Danggui and Chenpi in diaphoretic herbs harmonizes blood and regulates qi. Since sweat is transformed from blood, qi mechanism must be unobstructed for sweat to emerge. For those suffering from cold damage with slightly deficient constitution, this formula should be referenced.) Dawenzhong Yin adds Baizhu, along with Renshen, Shudi, and Chaihu in proper proportion. (Dawenzhong Yin is Mahuang Guijia Yin plus Renshen, Chaihu, Shudi, and Baizhu.) Fine pulse and aversion to cold indicate excess yin; warming and supporting yang restores spring-like vitality. (In cases of yang deficiency and yin excess, if warming the middle and supporting to expel pathogens is not employed, cold stagnation will deepen daily, inevitably leading to untreatable conditions.)