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Banxia (Pinelliae Rhizoma, washed) Guizhi (Cinnamomi Ramulus, bark removed) Gancao (Glycyrrhizae Radix et Rhizoma, honey-fried)
The above three ingredients are used in equal proportions. Each is separately pounded and sifted, then mixed together. Mix with rice water and administer one fangcun bi (a square-inch measure) of the powder per dose. Take three times a day. If the patient cannot take the powder directly, add two fangcun bi of the powder to one sheng (approx. 200ml) of water, boil seven times, then boil three more times. Remove from heat, allow to cool slightly, and swallow in small amounts frequently.

Shaoyin disease (disease pattern involving the Shaoyin channel), characterized by sore throat, is primarily treated with Banxia San and Banxia Tang. Note: Sore throat in Shaoyin disease mostly presents as upper heat and lower cold, and should not be treated with direct cooling agents. This formula uses Banxia to resolve phlegm, Guizhi to disperse pathogenic factors, and Gancao to relieve urgency, thereby avoiding the risk of damaging body fluids. For those who can swallow, use the powder; for those who cannot, use the decoction. The medicine must be allowed to cool slightly and swallowed in small amounts frequently. Since the pathology is located in the upper jiao, treatment focuses solely on the upper jiao, avoiding interference with the middle and lower jiao.

Zhufu (Porcine Skin, one jin)
The above single ingredient is boiled in ten dou (approx. 2L) of water until five sheng remain. Strain the dregs. Add one sheng of white honey and five he (approx. 100g) of white flour (rice powder). Cook until fragrant and well combined. Take warm, divided into six doses.
Shaoyin disease presenting with diarrhea, sore throat, chest fullness, and irritability is primarily treated with Zhufu Tang. Note: Diarrhea accompanied by sore throat may result from yin excess repelling yang to the upper level; treatment aims to drive out yin and restore yang, such as Tongmai Sini Jia Jiegeng Tang. Alternatively, it may result from yin deficiency where fluids fail to ascend and steam upward; treatment should nourish yin and restore fluids, such as this Zhufu Tang.
When kidney fluids flow downward instead of ascending and steaming upward, deficient fire fills the interior, causing irritability and fullness. Therefore, Zhufu nourishes the fluids of the Kidney organ, while white honey and rice powder moderate the action, retaining them in the middle jiao to transport essence and distribute fluids, resolving the crisis of upper heat and lower fluid depletion.
Yu Jiayan stated that the rationale for using Zhufu is similar to that of using black donkey-hide gelatin. Using pig skin with hair roots or thin skin would be weak in efficacy and inconsistent with the instruction to "cook until fragrant." It is correct to use only the outer skin, removing the inner fatty white layer.

Gancao (Glycyrrhizae Radix et Rhizoma, two liang)
The above single ingredient is boiled in three sheng of water until one sheng and five he remain. Strain the dregs. Take seven he warm. Take twice a day.
In Shaoyin disease, if sore throat appears within two to three days of onset, Gancao Tang may be administered. Note: Sore throat without diarrhea, occurring only two to three days after illness onset, indicates pathogenic heat lodging in the branch aspect of the Shaoyin channel. Sore throat in Shaoyin disease generally should not be treated with bitter-cold agents to directly suppress heat. Thus, only the sweet nature of Gancao is utilized to relieve Kidney urgency and control fire pathogens.