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After taking Da Qing Long Tang (Great Blue Dragon Decoction), if the patient experiences cold limbs (Jue Ni, reversal of cold), twitching of sinews, and tremors of muscles, this is a pathological reversal caused by improper treatment; it should be rescued with Zhen Wu Tang (True Warrior Decoction). In Tai Yang disease (Disease of the Tai Yang/Supreme-Yang channel), after inducing sweating, if the sweat does not resolve the condition and the patient still has fever, palpitations in the epigastrium (Xin Xia Ji), dizziness (Tou Xuan), body trembling and instability, feeling as if they are about to fall to the ground, Zhen Wu Tang is the primary prescription. In Shao Yin disease (Disease of the Shao Yin/Lesser-Yin channel), if the condition persists for two or three days and worsens by the fourth or fifth day, presenting with abdominal pain, difficult urination, heaviness and pain in the four limbs, and spontaneous diarrhea, this indicates the presence of fluid retention (Shui Qi). Among these patients, some may have cough, clear urination, difficult urination, or vomiting; in all such cases, Zhen Wu Tang is indicated.

In Shang Han (Cold Damage) disease, if the physician incorrectly uses purgatives, leading to continuous diarrhea with undigested food (Xia Li Qing Gu) and body pain, urgent treatment of the interior is required, preferably using Si Ni Tang (Four Reversal Decoction). If the pulse is floating and slow, indicating exterior heat and interior cold, accompanied by diarrhea with undigested food, Si Ni Tang is indicated. If the disease presents with fever, headache, but the pulse is unexpectedly deep, and the condition does not improve despite body pain, warming the interior is necessary, preferably using Si Ni Tang. If there is diarrhea with abdominal fullness and body pain, one must first warm the interior before attacking the exterior; warming the interior is best done with Si Ni Tang. Spontaneous diarrhea without thirst belongs to Tai Yin disease due to cold in the zang organs; warming therapy is appropriate, preferably using formulas from the Si Ni Tang category. In Shao Yin disease, if the pulse is deep, urgent warming is required, preferably using Si Ni Tang. In Shao Yin disease, if food is vomited immediately upon entering the mouth, and the heart feels warm with an urge to vomit but cannot, and at onset the hands and feet are cold with a string-tight and slow pulse, this indicates excess in the chest; purgation is contraindicated, and emesis should be used. However, if there is cold-fluid in the diaphragm causing dry retching, emesis is contraindicated; urgent warming is required, preferably using Si Ni Tang. After severe sweating or severe purgation leading to cold limbs, Si Ni Tang is indicated. After severe sweating, if fever persists, internal cramping occurs, limb pain exists, along with diarrhea, cold limbs, and aversion to cold, Si Ni Tang is indicated. If vomiting occurs with a weak pulse, clear urination, slight body heat, and cold limbs, the prognosis is difficult, but Si Ni Tang is still indicated. If after sweating or purgation the disease remains unresolved and irritability (Fan Zao) appears, Fu Ling Si Ni Tang (Poria and Four Reversal Decoction) is indicated. If purgation is followed by sweating, resulting in daytime irritability preventing sleep but quiet at night, without vomiting, thirst, or exterior signs, and with a faint, deep pulse and no significant heat, Gan Jiang Fu Zi Tang (Dried Ginger and Aconite Decoction) is indicated. For Shao Yin disease with diarrhea, Bai Tong Tang (White Passage Decoction) is indicated. For Shao Yin disease with diarrhea and a faint pulse, Bai Tong Tang is administered. If diarrhea continues, leading to cold limbs, absent pulse, dry retching, and irritability, Bai Tong Jia Zhu Dan Ye Tang (White Passage Decoction plus Pig Bile) is indicated. If the pulse suddenly emerges after taking the medicine, death ensues; if the pulse gradually returns, life is preserved. If eating leads to an urge to vomit, it belongs to Yang Ming disease, treated with Wu Zhu Yu Tang (Evodia Decoction). In Shao Yin disease, if there is vomiting and diarrhea, cold limbs, and extreme irritability making the patient wish to die, Wu Zhu Yu Tang is indicated. If there is dry retching with salivary discharge and headache, Wu Zhu Yu Tang is indicated. In Shao Yin disease, if there is diarrhea with pus and blood in the stool, Tao Hua Tang (Peach Blossom Decoction) is indicated. In Shao Yin disease, from the second or third day to the fourth or fifth day, if abdominal pain, difficult urination, continuous diarrhea, and pus/blood in stool occur, Tao Hua Tang is indicated.

Regarding the above syndromes, whether caused by loss of Yang after sweating, vomiting, abdominal pain, diarrhea, body pain, cold limbs, extreme irritability, faint/almost imperceptible pulse, salivary discharge, or bloody/purulent stool, they all belong to pathogenic Yin in the interior; thus, they are collectively categorized as Interior Cold Syndromes.

Zhen Wu Tang (True Warrior Decoction)
Fuling (Poria, 3 qian), Shaoyao (Peony Root, 3 qian), Shengjiang (Fresh Ginger, 3 qian), Baizhu (Atractylodes Macrocephala Rhizome, 2 qian), Fuzi (Prepared Aconite Lateral Root, 1 qian, processed). Decoct in water and take orally. If coughing, add Wubeizi (Schisandra Fruit, 1 qian), Ganjiang (Dried Ginger, 0.5 fen), and Xixin (Asarum Root, 0.5 fen). According to seasonal rules, remove Shengjiang. If urination is clear/profuse, remove Fuling. If diarrhea, remove Shaoyao and add Ganjiang (2 qian). If vomiting, remove Fuzi and double the amount of Shengjiang. Analysis: The syndromes treated by Zhen Wu Tang are caused by obstruction of fluid retention. Therefore, Fuling and Baizhu are used to drain water and dry dampness to strengthen the Spleen; Shengjiang stops vomiting and descends turbidity; Fuzi warms the cold of Kidney Water (Gui Shui); and Shaoyao clears wind from Liver Wood (Yi Mu).

Si Ni Tang (Four Reversal Decoction)
Gancao (Licorice Root, 2 qian), Ganjiang (Dried Ginger, 1.5 qian), Fuzi (Raw Aconite Lateral Root, 1 qian, raw use). Decoct in 1.5 cups of water until 0.8 cup remains, then take orally. Analysis: The syndromes treated by Si Ni Tang generally involve interior Yin-cold. Therefore, Gancao is used to support Earth (Spleen/Stomach), Ganjiang to warm the Middle Jiao, and Fuzi to warm the Lower Jiao.

Fu Ling Si Ni Tang (Poria and Four Reversal Decoction)
Fuling (Poria, 6 qian), Renshen (Ginseng Root, 1 qian), Fuzi (Aconite Lateral Root, 1 qian), Gancao (Licorice Root, 2 qian), Ganjiang (Dried Ginger, 1.5 qian). Decoct in water and take orally. Analysis: Loss of Yang due to sweating and purgation leads to Yang deficiency and irritability. Therefore, Fuling, Renshen, and Gancao are used to drain water and tonify Earth; Ganjiang and Fuzi warm the Spleen and nourish the Kidney.

Gan Jiang Fu Zi Tang (Dried Ginger and Aconite Decoction)
Ganjiang (Dried Ginger, 3 qian), Fuzi (Aconite Lateral Root, 3 qian). Decoct in water and take orally. Analysis: Loss of Yang due to sweating and purgation uproots the root of Yang, causing irritability and insomnia. Therefore, Ganjiang warms the Middle to restore Spleen and Stomach Yang, and Fuzi warms the Lower to restore Liver and Kidney Yang.

Bai Tong Tang (White Passage Decoction)
Congbai (Scallion White, 2 stalks, each 1.5 cun), Ganjiang (Dried Ginger, 3 qian), Fuzi (Aconite Lateral Root, 3 qian). Decoct in 2 cups of water until 0.8 cup remains, take warm. Analysis: Diarrhea causes Qi deficiency and sinking of Yang, leading to absent pulse. Therefore, Jiang and Fu are used to return Yang, and Congbai unblocks depression. When Yang returns and Qi moves freely, diarrhea stops and the pulse reappears.

Bai Tong Jia Zhu Dan Ye Tang (White Passage Decoction plus Pig Bile)
Congbai (Scallion White, 2 stalks), Ganjiang (Dried Ginger, 3 qian), Fuzi (Aconite Lateral Root, 3 qian). Decoct in water, then add Ren Niao (Human Urine, 15 teaspoons) and Zhu Dan Zhi (Pig Gallbladder Bile, 7 teaspoons), mix well, and take warm. Analysis: In conditions of extreme Yin repelling Yang, Jiang and Fu cannot reach the lower burner, potentially increasing upper heat. Therefore, Ren Niao and Zhu Dan Zhi are added to clear the Ministerial Fire and eliminate upper heat.

Wu Zhu Yu Tang (Evodia Decoction)
Renshen (Ginseng Root, 2 qian), Wu Zhuyu (Evodia Fruit, 2 qian), Shengjiang (Fresh Ginger, 4 qian), Dazao (Jujube, 3 pieces). Decoct in water and take orally. Analysis: The syndromes treated by Wu Zhu Yu Tang generally involve collapse of Middle Qi and extreme Yang deficiency. Therefore, Renshen and Dazao are used to tonify Earth and support the Middle; Wu Zhuyu and Shengjiang warm the Stomach and return Yang.

Tao Hua Tang (Peach Blossom Decoction)
Chishizhi (Red Kaolin, 1 liang 6 qian), Ganjiang (Dried Ginger, 1 qian), Jingmi (Rice Grain, 4 qian). Reserve half of the Chishizhi, sieve into powder. Decoct Jingmi in 4 cups of water until 2 cups remain. Add one Fang Cun Bi (square-inch spoonful) of Chishizhi powder, divide into two doses. If cured after one dose, do not take the remainder. Analysis: The syndromes treated by Tao Hua Tang involve cold-water and damp-earth. Therefore, Jingmi tonifies Earth and drains dampness, Ganjiang warms the Middle and dispels cold, and Chishizhi astringes the intestines and secures against prolapse/diarrhea.