石膏（二斤碎） 知母（六两） 甘草（二两） 粳米（六合）
上四味。以水一斗。煮米熟汤成。去滓。温服一升。日三服。
经云。三阳合病。腹满身重。难以转侧。口不仁而面垢。谵语遗尿。发汗则谵语。下之
则额
上生汗。手足逆冷。若自汗者。白虎汤主之。按三阳合病。其脉浮大。其证欲眠。而目合则
汗。谛实此三阳合病之证。而见腹满身重者。阳盛于经。里气莫支也。口不仁而谵语者。热
淫于内。神识为蒙也。因而浊气上蒸则面垢。阴津下泄则遗尿。若汗若下。皆足以夺津液而
召变。计惟白虎。肃肺金而清胃热。则表里之邪自解耳。
诸书皆谓白虎主治阳明经热。此三阳合病。而何以独责阳明。因谓阳明居中土万物所归
。三阳
合邪。故统于阳明主治。愚按方中之用石膏知母。取降肺金清肃之气。而滋肾水生化之源。
水出高源胃土藉资灌溉。兼以甘草粳米。载之逗遛上焦。以生津而化燥则烦热自蠲。所谓治
病必求其本也。
又经云。伤寒脉滑而厥者。里有热也。白虎汤主之。按厥之一证。总为入里之候。但有
寒热
。之不同。脉微而厥为寒厥。脉滑而厥为热厥。前因失治而致厥。若既见厥而复失治。则热邪
愈转愈深。阴津之亡。可立而待。故急用白虎保阴津而驱阳热。以预弭热深厥深之变也。
再按大青龙之与白虎同用石膏。而主治各别。青龙主雨。譬如甘霖遍野。而蒸郁自消也
。白虎主风。
譬如凉 荐爽。而炎 若失也。故用青龙以无汗
为辨。用白虎以自汗为辨。
石膏（二斤，捣碎） 知母（六两） 甘草（二两） 粳米（六合）
以上四味药。用水一斗。煮至米熟汤成。滤去药渣。每次温服一升。每日服用三次。
《内经》说：三阳合病（太阳、阳明、少阳三经同时受邪），出现腹部胀满、身体沉重、难以翻身转侧、口舌麻木不知五味且面色污垢、胡言乱语、小便失禁等症状。如果误用发汗法，会导致胡言乱语加重；如果误用攻下法，则会出现额头出汗、手脚逆冷。如果有自汗出的症状，应用白虎汤主治。我认为三阳合病，其脉象浮大，患者想睡觉，但眼睛一闭就出汗。仔细审视这是三阳合病的证候。出现腹部胀满、身体沉重的原因，是阳气盛于经络，导致里气无法支撑。口舌麻木不知五味和胡言乱语，是因为热邪淫溢于体内，神识被蒙蔽。因此浊气上蒸导致面色污垢，阴津下泄导致小便失禁。无论是发汗还是攻下，都足以耗夺津液而招致变证。计策唯有使用白虎汤，肃降肺金之气并清泻胃热，那么表里之邪自然解除。
各种医书都说白虎汤主治阳明经热。这里是三阳合病，为什么唯独责求于阳明？因为认为阳明居中属土，是万物所归之处。三阳合邪，所以统归于阳明主治。我按察方中用药，石膏和知母，取的是降肺金清肃之气，从而滋补肾水生化之源。肾水出于高源，胃土借此得到灌溉。再加上甘草和粳米，承载药力逗留于上焦，以生津液而化解燥热，那么烦热自然消除。这就是所谓治病必求其本。
又《内经》说：伤寒脉象滑利而四肢厥冷的，是里有热邪。应用白虎汤主治。我认为厥冷这一证候，总归是病邪入里的征候，但有寒热之分不同。脉微细而厥冷的是寒厥，脉滑利而厥冷的是热厥。前文因失治而导致厥冷，如果已经见到厥冷再失治，那么热邪会越陷越深，阴津的亡失，可以立刻等待到（即很快发生）。所以急需使用白虎汤保护阴津并驱除阳热，以预先消除热深厥深的变证。
再按察大青龙汤与白虎汤虽然都同用石膏，但主治各不相同。大青龙汤主雨，譬如甘霖遍布田野，郁蒸之气自然消散。白虎汤主风，譬如凉风送爽，炎热之感仿佛消失。所以使用大青龙汤以无汗为辨证要点，使用白虎汤以自汗为辨证要点。
Shigao (Gypsum Fibrosum, 2 jin, crushed) Zhimu (Anemarrhenae Rhizoma, 6 liang) Gancao (Glycyrrhizae Radix et Rhizoma, 2 liang) Jingmi (Oryzae Sativa Semen, 6 he)
The above four ingredients. Use one dou of water. Boil until the rice is cooked and the decoction is ready. Strain to remove the dregs. Take one sheng warm each time, three times a day.
The Classic states: In San Yang He Bing (Concurrent disease of the Taiyang, Yangming, and Shaoyang channels), there are symptoms of abdominal fullness, heaviness of the body, difficulty in turning over, numbness of the mouth with a dirty complexion, delirium, and urinary incontinence. If sweating methods are used, delirium will worsen; if purgative methods are used, sweat will appear on the forehead, and the hands and feet will become cold. If there is spontaneous sweating, Baihu Tang (White Tiger Decoction) should be administered. I observe that in San Yang He Bing, the pulse is floating and large, the patient desires sleep, and sweats when closing the eyes. Carefully examining this, these are the signs of San Yang He Bing. The reason for abdominal fullness and body heaviness is that Yang Qi is excessive in the channels, causing the interior Qi to be unable to support itself. Numbness of the mouth and delirium occur because heat pathogens overflow within, obscuring the Shen Spirit. Consequently, turbid Qi steams upward causing a dirty complexion, and Yin fluids leak downward causing urinary incontinence. Both sweating and purging are sufficient to deplete Jin Ye (Body Fluids) and invite complications. The only strategy is to use Baihu Tang to descend Lung Metal Qi and clear Stomach Heat, so that exterior and interior pathogens resolve naturally.
Various books state that Baihu Tang mainly treats Yangming Channel Heat. Here it is San Yang He Bing, why is responsibility placed solely on Yangming? It is believed that Yangming resides in the center as Earth, where all things return. When pathogens combine from the three Yang channels, they are unified under Yangming treatment. Upon examination of the formula's usage, Shigao and Zhimu take the descending and clearing nature of Lung Metal to nourish the source of Kidney Water generation. Water originates from the high source, and Stomach Earth relies on it for irrigation. Additionally, Gancao and Jingmi carry the medicine to linger in the Upper Jiao, generating Jin Ye and resolving dryness, thus eliminating vexation and heat. This is what is meant by "treating diseases requires seeking the root."
Furthermore, the Classic states: In Shanghan (Cold Damage), if the pulse is slippery and there is Jue Ni (cold extremities), it indicates Heat in the interior. Baihu Tang should be administered. I consider that Jue Ni is generally a sign of pathogen entering the interior, but it differs in Cold and Heat. A fine pulse with Jue Ni is Han Jue (Cold Jue), while a slippery pulse with Jue Ni is Re Jue (Heat Jue). Previously, due to mismanagement, Jue occurred; if mismanaged again after Jue appears, the Heat pathogen will sink deeper, and the loss of Yin fluids will follow immediately. Therefore, it is urgent to use Baihu Tang to protect Yin fluids and drive out Yang Heat, thereby preventing the complication of deep heat leading to deep Jue.
Additionally, Da Qing Long Tang (Major Green Dragon Decoction) and Baihu Tang both use Shigao, but their main treatments differ. Da Qing Long Tang governs Rain, like sweet rain covering fields, dissipating stagnation and oppression. Baihu Tang governs Wind, like cool breezes refreshing, making heat feel as if lost. Thus, Da Qing Long Tang is differentiated by the absence of sweating, while Baihu Tang is differentiated by the presence of spontaneous sweating.