于白虎汤方内。加人参三两。余根据白虎汤法。
王三阳云。前条脉洪大者。不渴。此条洪大者。烦渴不解。故二汤不同。
太阳病。发热、恶寒。热多寒少。脉微弱者。此无阳也。不可更汗。宜桂枝二越婢
一汤方。
桂枝（去皮） 芍药 甘草（各十八铢） 生姜（一两三钱切） 大枣（四枚擘）
麻黄（十八铢去节） 石膏（二十四铢碎绵裹）
上七味。 咀。以五升水。煮麻黄一二沸。去上沫。内诸药。煮取二升。去滓。温
服一升。本方当裁为越婢汤。桂枝汤合饮一升。今合为一方。桂枝二越婢一。
胃为十二经之主。脾治水谷。为卑脏。若婢。内经曰。脾主为胃行其津液。是汤所
以谓之越脾者。以发越脾气通行津液。外台方一名越脾汤。即此义也。
唐不岩云。桂枝、麻黄、越脾或一或二。此即大小奇偶之义。以各半汤详之。曰一
者。当是一之一。无所用去其半也。曰二者。当是二之一。乃所谓各半之半也。及考分
两。本论与活人书。参差不一。然以小发其汗为各半汤谓桂枝止。麻黄发。今在止发之
间。故裁为各半。则汗出必解者。自应麻黄多。桂枝少。不可更汗者。自应桂枝少。石
膏多也。
又云。桂枝麻黄各半汤。即桂枝证药也。桂枝二麻黄一汤。即麻黄证药也。桂枝二
越婢一汤。即大青龙证药也。总是一太阳病。病与时日有浅与深。脉与形证。有应与否。
权衡剂量。不失铢黍。于此见古人立方之妙。
张卿子云。无阳二字宜审。谓脾气不发越耳。又云。寒少。故桂枝少。热多。故石
膏多。
服桂枝汤。或下之。仍头项强痛。翕翕发热。无汗。心下满。微痛。小便不利者。
桂枝汤、去桂加茯苓白术汤主之。
头项强痛。翕翕发热。虽经汗下。为邪气仍在表也。心下满。微痛。小便利者。则
欲成结胸。今外证未罢。无汗。小便不利。则心下满。微痛。为停饮也。与桂枝汤以解
外。加茯苓白术。利小便。行留饮。
In the formula of Baihu Tang (White Tiger Decoction), add Renshen Sanliang (Three Qian of Ginseng Root). The remainder follows the method of Baihu Tang.
Wang Sanyang stated: In the previous clause, the pulse was surging but there was no thirst; in this clause, the pulse is surging accompanied by vexation and unrelenting thirst. Therefore, these two decoctions differ.
Taiyang disease (Disease of the Taiyang channel) presents with fever, aversion to cold, where heat predominates over cold. If the pulse is faint, this indicates a state of "No Yang" (Deficiency of Yang Qi). Do not induce sweating again; instead, Guizhi Er Yuebi Yi Tang (Cinnamon Twig Twice, Mahuang Decoction One Time Formula) is indicated.
Guizhi (Cinnamon Twig, peeled), Shaoyao (Peony Root), Gancao (Licorice Root, each 18 Zhu), Shengjiang (Fresh Ginger, 1 Liang 3 Qian, sliced), Dazao (Jujube, four pieces, split), Mahuang (Ephedrae Herba, 18 Zhu, nodes removed), Shigao (Gypsum Fibrosum, 24 Zhu, crushed, wrapped in cotton).
The above seven ingredients are coarsely powdered. Boil with five sheng of water. First boil Mahuang for one or two boils, remove the foam on the surface, then add the remaining herbs. Boil until two sheng of liquid remain, strain, and take one sheng warm. This formula should theoretically be viewed as a combination of Yuebi Tang and Guizhi Tang taken in a ratio such that one sheng is consumed. Now they are combined into one formula, named Guizhi Er Yuebi Yi Tang.
The Stomach is the master of the twelve channels. The Spleen manages water and grain, holding a humble position akin to a maid. The *Neijing* states: "The Spleen governs transporting the fluids for the Stomach." This decoction is called "Yuebi" (literally "Surpassing the Maid") because it stimulates the Spleen's Qi to circulate fluids. The *Waitai Miyao* lists a formula named Yuepi Tang, which shares this meaning.
Tang Buyan stated: The proportions of Guizhi, Mahuang, and Yuebi (Yuepi) being one or two reflect the principles of odd and even combinations. Examining Ge Ban Tang (Half-and-Half Decoction): "One" implies a whole unit without halving; "Two" implies half of a double unit, i.e., half of the half. However, dosage records in the original text and *Huren Shu* vary. Nevertheless, regarding "mild diaphoresis" as the principle of Ge Ban Tang, Guizhi arrests sweating while Mahuang induces it. Currently, we are between arresting and inducing, so we adjust to a half-and-half ratio. To ensure resolution through sweating, Mahuang should be more abundant and Guizhi less so. For conditions where further sweating is contraindicated, Guizhi should be reduced and Shigao increased.
Furthermore: Guizhi Mahuang Ge Ban Tang addresses Guizhi syndrome patterns; Guizhi Er Mahuang Yi Tang addresses Mahuang syndrome patterns; Guizhi Er Yuebi Yi Tang addresses Da Qinglong Tang syndrome patterns. All belong to Taiyang disease, but the depth varies with time, and pulse/symptom presentations vary in correspondence. Weighing dosages precisely reveals the subtlety of ancient formula creation.
Zhang Qingzi stated: The term "No Yang" requires careful examination, referring here to the failure of Spleen Qi to ascend and spread. He also noted: Because cold is slight, Guizhi is used in small amounts; because heat is significant, Shigao is used in larger amounts.
After taking Guizhi Tang, or following purgative therapy, if headache and stiffness of the neck and occiput persist, along with mild fever, absence of sweat, fullness in the epigastrium, slight pain, and difficulty urinating, treat with Guizhi Tang minus Guizhi plus Fuling and Baizhu.
Headache and stiffness of the neck and occiput, along with mild fever, indicate that pathogenic factors remain in the exterior despite prior sweating or purgation. If there is epigastric fullness, slight pain, and free urination, Jie Xiong (Chest Binding) may develop. Here, since exterior signs persist, there is no sweat, and urination is difficult, the epigastric fullness and slight pain are due to retained fluid retention. Administer Guizhi Tang to resolve the exterior, adding Fuling and Baizhu to promote urination and move stagnant fluids.