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Fangji Banxia (Rhizoma Pinelliae) one sheng, Shengjiang (Zingiberis Rhizoma Recens) half jin, Fuling (Poria) three liang.
The above three ingredients are decocted in seven sheng of water until one sheng and five he remain. The resulting liquid is divided into two doses and taken warm.

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Individuals prone to vomiting should naturally feel thirsty; if they feel thirsty, it indicates that the condition is about to resolve. If they do not feel thirsty now, it is due to Zhiyin (fluid retention in the chest and diaphragm). Xiao Banxia Tang (Minor Cinnamon Twig Decoction) is the primary formula for this.
[Annotation]
In individuals with Yin (fluid retention), thirst occurs because fluid stagnation prevents Qi transformation from generating body fluids. In individuals who vomit frequently, thirst occurs because vomiting dries the stomach and damages body fluids; thus, it is said that those prone to vomiting should naturally be thirsty. If vomiting is followed by thirst, small amounts of water should be given to harmonize the Stomach Qi and generate fluids, indicating the condition is resolving. If there is no thirst after vomiting, it is certain that Zhiyin has existed in the epigastrium. Xiao Banxia Tang is used solely to stop vomiting without adding Fuling (Poria) because the absence of thirst implies no new fluid accumulation, and since body fluids have already been damaged by vomiting, diuresis should not be employed again to avoid further exhausting the fluids.
[Collected Annotations]
Li [Name] stated: This formula specifically treats vomiting. Thirst in those prone to vomiting indicates resolution, as Stomach Qi recovers and fluids are generated. If Zhiyin exists in the epigastrium, there is no dryness and thus no thirst; instead, fluid overflow causes vomiting. Banxia (Rhizoma Pinelliae) and Shengjiang (Zingiberis Rhizoma Recens) are warm to harmonize Stomach Qi and pungent to disperse rebellious Qi, making them the "holy medicine" for treating vomiting.

Fangji Banxia (Rhizoma Pinelliae) one sheng, Shengjiang (Zingiberis Rhizoma Recens) half jin.
The above two ingredients are decocted in seven sheng of water until one sheng and a half remain. The resulting liquid is divided into two doses and taken warm.
[Collected Explanations]
Shen Mingzong stated: This is a formula for vomiting caused by Zhiyin overflowing upward. Vomiting inevitably damages body fluids, so thirst should occur; hence, it is said that those prone to vomiting should naturally be thirsty. Thirst indicates that the pathogen is expelled through vomiting, termed "about to resolve." If Zhiyin exists in the epigastrium, stagnating in the chest and diaphragm causing dryness, vomiting occurs without thirst. In such cases, the fluid must be treated; therefore, Shengjiang (Zingiberis Rhizoma Recens) disperses pathogens, and Banxia (Rhizoma Pinelliae) clears fluid, stopping vomiting naturally.

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For sudden vomiting, epigastric fullness and obstruction (Pi), fluid between the diaphragm, dizziness (Xuan), and palpitations (Ji), Banxia Jia Fuling Tang (Banxia Plus Poria Decoction) is the primary formula.
[Annotation]
Sudden vomiting accompanied by epigastric fullness despite the absence of thirst indicates fluid coagulation between the diaphragm. Dizziness results from fluid obstructing Yang Qi from ascending; palpitations result from fluid Qi attacking the Heart. Even if there is no thirst and no new fluid accumulation, it can be inferred that fluid abundance exists normally. Therefore, concern for body fluids is set aside, and Fuling (Poria) must be added to promote diuresis, thereby opening the fluid coagulation and clearing the obstruction.
[Collected Annotations]
Zhao Liang stated: Epigastric fullness, fluid between the diaphragm, dizziness, and palpitations indicate that Yang Qi cannot diffuse freely. The Classics state: "Disperse with pungent substances." Both Banxia (Rhizoma Pinelliae) and Shengjiang (Zingiberis Rhizoma Recens) are pungent. Bencao records that Banxia treats phlegm above the diaphragm. Epigastric hardness, vomiting, rebellious Qi, and dizziness also stem from deficiency of Upper Jiao Yang Qi failing to ascend; thus, Banxia and Shengjiang treat these together. Palpitations indicate the Heart is overwhelmed by Water; Banxia alone cannot treat this. Fuling must be added to remove water, descend rebellious Qi from the Kidney, and calm the Spirit. When the Spirit is calm, palpitations subside.
You Yi stated: Fluid Qi rebelling in the Stomach causes vomiting; stagnating in the Qi mechanism causes epigastric fullness; overwhelming the Heart causes palpitations; obscuring Yang causes dizziness. Banxia and Shengjiang stop vomiting and direct rebellious Qi downward, while added Fuling removes the water.