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Gancao (Radix Glycyrrhizae Preparata, 2 liang), Ganjiang (Rhizoma Zingiberis Preparata, 1.5 liang), Fuzi (Radix Aconiti Lateralis Preparata, 1 piece).
Decoct and take the medicine when it has cooled down.
This formula is indicated for spontaneous diarrhea without thirst in Taiyin disease (disease of the Spleen/Stomach channel characterized by deficiency-cold), Yin syndrome (syndrome characterized by deficiency-cold) presenting with a deep pulse and body pain, as well as cold extremities with diarrhea and an imperceptible pulse.
The discussion states: Spontaneous diarrhea without thirst belongs to Taiyin. Taiyin governs the transformation and transportation of water and grain; thus, illness leads to spontaneous diarrhea. The presence of true cold inside causes the lack of thirst. "Yin syndrome" refers generally to the three Yin channels, implying it is not limited to Taiyin alone. Since the pathology is in the interior, the pulse is deep. Cold causes blood vessels to coagulate and become stagnant, resulting in body pain. The four limbs receive Qi from the interior; interior cold suppresses Yang. When cold pathogen dominates internally, treatment should employ sweet and hot agents. Therefore, Gancao, Ganjiang, and Fuzi, which are strongly hot, are used to promote Yang Qi and dispel Yin cold, thereby warming the meridians and muscles to reverse cold extremities. Hence, the decoction is named Si Ni Tang (Four Extremities Reversal Decoction). However, it must be taken cool because the classics state: "Treat cold with heat, but administer it cool." Otherwise, in cases of Dai Yang syndrome (floating false Yang), using hot medicine hotly would exacerbate upper dryness, potentially leading to bleeding from the eyes, ears, mouth, and nose. The difficulty in applying medicinal substances is such.

Ganjiang (Rhizoma Zingiberis Preparata, processed), Huanglian (Rhizoma Coptidis Preparata, processed), Huangqin (Radix Scutellariae Preparata, processed), Renshen (Radix Ginseng Preparata, de-rhizome, each 3 liang).
This formula treats conditions where, after erroneous emesis or purgation in Shanghan (Cold Damage), cold pathogen becomes obstructed internally, causing food to be vomited immediately upon entering the mouth.
Emesis and purgation were inappropriate yet applied, hence termed "erroneous emesis and purgation." For instance, using Zhi Zi (Fructus Gardeniae) or Gua Di (Semen Coicis/other emetics) for emesis, and Cheng Qi Tang (Harmonizing the Qi Decoctions) for purgation, these agents are inherently cold. Erroneous use damages Middle Qi (Spleen/Stomach Qi). With Middle Qi both deficient and cold, there is aversion to grain Qi, causing immediate vomiting upon ingestion. "Immediate vomiting upon entry" means the food has not even been swallowed. Ganjiang's pungent-hot nature disperses cold; Renshen's sweet-warm nature tonifies deficiency; additionally, Huangqin and Huanglian's cold-bitter nature is employed to borrow their cold quality to facilitate passage through the obstruction (Ge Ju). The classics say: "If one borrows the Qi (nature/flavor), there are no prohibitions," which precisely refers to this principle. Unless one deeply comprehends the essence of the classics, how could one master such variations?

Danggui (Radix Angelicae Sinensis, cleaned), Guizhi (Ramulus Cinnamomi), Shaoyao (Radix Paeoniae Alba, stir-fried, each 3 liang), Xixin (Herba Asari, cleaned), Gancao (Radix Glycyrrhizae Preparata, honey-fried), Tongcao (Medulla Tetrapanacis, each 2 liang), Dazao (Fructus Jujubae, 25 pieces).
The discussion states: In Shanghan, if the pulse is slippery and there are cold extremities, it indicates heat within the interior, treated with Baihu Tang (White Tiger Decoction); if hands and feet are cold with a fine pulse nearly absent, it is treated with Danggui Sini Tang (Angelica Four Extremities Reversal Decoction).
A slippery pulse is a Yang pulse. Thus, the cold extremities constitute Yang Jue (Yang reversal/cold extremities due to excess heat), representing extreme fire intensity, analogous to the image of "Arrogant Dragon will have cause to repent" in the top nine line of the Qian Hexagram in the I Ching; therefore, Baihu Tang is used. See previous text for Baihu Tang analysis. If hands and feet are cold with a fine pulse nearly absent, Baihu Tang is not suitable. Cold extremities indicate exterior Yang deficiency, failing to warm the four extremities; a fine pulse nearly absent indicates interior Yin-blood deficiency, impeding pulse flow. Due to exterior Yang deficiency, Guizhi and Xixin are used to warm the exterior; due to interior Yin-blood deficiency, Danggui and Shaoyao are used to regulate the interior; Tongchai unites Yin and Yang; Dazao and Gancao harmonize Ying (Nutritive) and Wei (Defensive) Qi. This syndrome progresses from exterior to interior; although it is said to transmit to the Jueyin channel, it remains fundamentally a Yang syndrome, distinct from direct invasion of the Three Yin channels by cold pathogen. Therefore, Wuzhuyu (Fructus Evodiae), Ganjiang, and Fuzi are not used, but rather Guizhi Tang (Cinnamon Twig Decoction) added with Danggui, Xixin, and Tongcai. Those who are clear will understand this naturally.