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Fuling (Poria) 4 liang, Guizhi (Cinnamon Twig) 3 liang, Baizhu (Atractylodis Rhizoma) 2 liang, Gancao (Licorice Root, honey-fried) 2 liang.
The above four ingredients are decocted with six sheng of water until three sheng remain. The dregs are removed, and the liquid is divided into three warm doses.

[Analysis of the Formula]
"Body trembling and shaking" refers to tremulous vibration and swaying of the body; "body trembling and wanting to fall to the ground" refers to tremulous vibration and a sensation of collapsing onto the floor. Both conditions arise from deficiency of Yang Qi, resulting in a loss of support. Zhenwu Tang (True Warrior Decoction) is used to correct the error of misapplied sweating therapy from Qinglong Decoction (Blue Dragon Decoction); at this stage, the pathogenic factor has entered the Shaoyin Meridian (Lesser Yin Meridian). Therefore, Fuzi (Aconite Lateralis Radix Preparata) is used as the principal herb, assisted by Shengjiang (Zingiberis Rhizoma Recens), Fuling, and Baizhu, aiming to strengthen interior Yang to control Water Retention. This formula (Fuling Guizhi Baizhu Gancao Tang) is used to correct the error of misapplied sweating therapy from Mahuang Decoction (Ephedra Decoction); at this stage, the pathogenic factor remains in the Taiyang Meridian (Greater Yang Meridian). Therefore, Guizhi is used as the principal herb, assisted by Gancao, Fuling, and Baizhu, aiming to support exterior Yang to cleanse Phlegm-Fluids. As for the use of Shaoyao (Paeoniae Radix Alba) in Zhenwu Tang: due to interior cold and excess of Yin, Yang is deficient and lacks foundation. Within strong warming and dispersing herbs, if acid-astringent substances are not added, there is a risk of "Extreme Yin Repelling Extreme Yang" (Ji Yin Ge Yang), which would accelerate the flight and dissipation of Yang Qi. In this formula, Shaoyao is omitted because interior cold and Phlegm-Fluids are excessive; if acid-astringent substances were added, the Phlegm-Fluids might coagulate and fail to disperse upon contact with the sour taste.

After sweating or purging therapies, if restlessness, heat, and a sensation of obstruction in the chest occur, Zhizi Chi Decoction (Gardenia and Fermented Soybean Decoction) is the primary treatment.

[Annotation]
If the exterior syndrome is unresolved after sweating, and purging therapy is subsequently applied, the exterior pathogen enters the interior. It does not transform into the excess pattern of Jie Xiong (Chest Binding) or Qi Chong (Rushing of Qi), nor does it transform into the deficiency pattern of Pi Syndrome (Epigastric Fullness) or diarrhea. Instead, it manifests only as restlessness, heat, and a sensation of obstruction in the chest. This is because the exterior pathogen is mild and the depth of invasion is shallow, resulting merely in restlessness and discomfort in the chest. Zhizi (Gardeniae Fructus) is bitter, capable of inducing vomiting and purging, and cold, capable of overcoming heat. Chidouchi (Sojae Semen Praeparatum) is light and ascending due to its fermented nature. Assisting Zhizi, it directs the pathogenic heat upward to be expelled via the mouth. Thus, after one episode of vomiting, the chest feels relieved, and the restlessness and heat resolve.

[Collected Annotations]
Fang Youzhi stated: "Obstruction" refers to the stagnation and blocking of Qi caused by pathogenic heat, creating a sensation of coldness without reaching the level of pain; it is lighter than pain.
Cheng Zhi stated: If after purging, Yang pathogens are bound internally, treat with formulas that attack the chest binding; if Yin pathogens are bound internally, treat with formulas that open the heart (Xie Xin); if extreme deficiency-heat rises causing vexation, induce vomiting with Zhizi Chi Decoction. If phlegm is abundant in the chest before purging, induce vomiting with Gualian San (Melon Seed Powder); if deficiency-vexation exists in the chest after purging, induce vomiting with Zhizi Chi Decoction. The ancients' methods for deficiency, excess, cold, and heat were so clear and comprehensive.
Lin Lan stated: Yang Qi receives its energy in the chest. If sweating or purging depletes Yang Qi, pathogenic heat lodges in the chest, condensing and failing to disperse, causing restlessness, heat, and obstruction. Therefore, this decoction is suitable for expelling pathogens from the chest via vomiting.
Wang Hu stated: A sensation of obstruction in the chest indicates the presence of physical matter in the chest. Purging fails to expel it because the matter is located above the diaphragm; therefore, emesis (vomiting therapy) is appropriate.