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Indicated for stubborn cold stagnating in the intestines and stomach, presenting with diarrhea and abdominal pain. The pathogenic factor should first be expelled using purgation, followed by regulatory treatment. One must not assume that because the patient is deficient, only nourishing methods should be used to treat the disease.

Houpo (Magnoliae Officinalis Cortex) 2 liang, Ganjiang (Zingiberis Rhizoma) 2 liang, Gancao (Glycyrrhizae Radix et Rhizoma) 2 liang, Guixin (Cinnamomi Ramulus) 2 liang, Fuzi (Aconiti Lateralis Radix Praeparata) 2 liang, Dahuang (Rhei Radix et Rhizoma) 4 qian.
Crush the above herbs into coarse powder. Take 1 liang of the powder, add 2 zhong (approx. 400 ml) of water, decoct until 6 fen (approx. 240 ml) remains, and take in one dose.

[Collected Annotations] Yu Chang commented: Xu Shuwei formulated this prescription, deeply adhering to Zhang Zhongjing's method of "using warm medicines to purge." The use of only 4 qian of Dahuang (Rhei Radix et Rhizoma) demonstrates profound insight. Since stubborn cold in the intestines and stomach has caused diarrhea, how could one dare to use the fierce and heavy Dahuang (Rhei Radix et Rhizoma) within warm medicines to further burden the spleen and stomach? Reducing the dosage by one-fifth reveals how deeply Xu Shuwei understood Zhang Zhongjing's teachings. Zhang Zhongjing stated: "If a patient has chronic loose stools, Zizhi Tang (Gardenia Decoction) must not be administered." He also said: "In Taiyin disease, if the pulse is weak and there is dysentery, if Dahuang (Rhei Radix et Rhizoma) or Shaoyao (Paeoniae Radix Alba) are indicated, their dosages should be reduced, because the person's Stomach Qi is weak and easily disturbed." From this, it is evident that for diarrhea caused by stubborn cold in the intestines and stomach, can Dahuang (Rhei Radix et Rhizoma) be used recklessly? If not used, the warm medicines may fail to control the pathogen, and the tendency toward profuse watery diarrhea might increase; thus, careful consideration and usage make this truly a model to follow.

Indicated for unilateral hypochondriac pain accompanied by fever, with a tight and wiry pulse. This indicates Cold, and should be treated with warm medicines combined with purgation.

Dahuang (Rhei Radix et Rhizoma) 2 liang, Fuzi (Aconiti Lateralis Radix Praeparata) (prepared) 2 pieces, Xixin (Asari Radix et Rhizoma) 2 liang. Take these three ingredients, add 5 sheng (approx. 1000 ml) of water, boil to obtain 2 sheng (approx. 400 ml), divide into three warm doses. For robust individuals, take 2.5 sheng (approx. 500 ml), divided into three doses. After taking the medicine, approximately after walking for four or five li (approx. 2-2.5 km), administer another dose.

[Collected Annotations] Yu Chang commented: Zhang Zhongjing treated exterior cold transforming into heat pathogen obstructing the epigastrium, complicated by Yang deficiency and Yin excess, using the method of Fuzi Xie Xin Tang (Aconite Heart-Purging Decoction). In miscellaneous diseases, unilateral hypochondriac pain and fever belong to Yang syndromes, while wiry and tight pulses belong to Yin syndromes; this indicates that Yin pathogenic factors are reversing upward amidst Yang. Thus, he established this method of "using warm medicines to purge." However, few later generations have grasped Zhang Zhongjing's earnest teachings. The *Jin Gui Yao Lue* (Essential Prescriptions of the Golden Cabinet) adds another clause: "If the pulse is rapid and tight, or wiry like a bowstring, firm and unyielding to pressure, where the pulse is rapid and wiry, the Cold should be purged; if the pulse is tight and slow, there will surely be hardness in the epigastrium; if the pulse is large and tight, there is Yin within Yang, and purgation is permissible." Readers often fail to grasp the intent, not realizing that all these refer to the method of "using warm medicines to purge." "Purging the Cold" means that when there is solid Yin pathogen within Yang, purgation is applicable; the golden key is clearly visible. Zhang Lu stated: San Chengqi Tangs (Three Cinnamon-Bark and Rhubarb Decoctions) are the gentle agents of cold purgation; Baisan (White Powder) and Beiji Wan (Emergency Pill) are agents of hot purgation; Fuzi Xie Xin Tang (Aconite Heart-Purging Decoction) and Dahuang Fuzi Tang (Rhubarb and Aconite Decoction) are harmonizing agents for conditions of intertwined Cold and Heat, combining gentleness and strength. Modern practitioners only know the path of cold purgation and completely ignore the method of warm purgation. It is generally believed that acute heat accumulation can be purged with cold, but can long-standing cold accumulation be purged with cold? This is why methods like Beiji Wan were established. However, these are only suitable for solid Cold accumulation. If a patient has a constitution that is inherently deficient, even if there is solid pathogenic retention, how could one dare to attack with fierce and harsh drugs? Therefore, Zhang Zhongjing established Fuzi Xie Xin Tang (Aconite Heart-Purging Decoction), using Huangqin (Scutellariae Radix) and Huanglian (Coptidis Rhizoma) to assist Dahuang (Rhei Radix et Rhizoma) in dispelling Heat obstruction in the diaphragm, while simultaneously using Fuzi (Aconiti Lateralis Radix Praeparata)'s warmth to scatter it; Dahuang Fuzi Tang (Rhubarb and Aconite Decoction) uses Xixin (Asari Radix et Rhizoma) to assist Fuzi (Aconiti Lateralis Radix Praeparata) in attacking Cold accumulation in the hypochondrium, while simultaneously using Dahuang (Rhei Radix et Rhizoma)'s coldness to guide it. Combining Cold and Heat, applying warmth and purgation together, this is the manifest and miraculous method of the Sages.