此即桂枝汤加麻黄三两，葛根四两。
葛根（四两） 麻黄（三两，去节） 芍药（二两） 生姜（三两，切） 甘草（二两，炙） 桂枝（三两，去
皮） 大枣（十二枚，擘） 上七味，以水一斗，先煮麻黄葛根。二味主药先煮。减二升，去上沫，纳诸药，煮取三升，
去渣，温服一升，覆取微似汗，不须啜粥，已经发汗矣。余如桂枝法将息及禁忌。
太阳病，项背强几几，无汗，恶风，葛根汤主之。
前桂枝加葛根汤一条，其现症亦同，但彼云∶“反汗出”，故无麻黄。此云∶“无汗”，故加麻黄也。
阳明症，汗出而恶热，今无汗而恶风，则未全入阳明，故曰太阳病。
按∶葛根，《本草》∶治身大热。大热乃阳明之症也，以太阳将入阳明之经，故加此药。
太阳与阳明合病者，必自下利，葛根汤主之。合病全在下利一症上审出，盖风邪入胃则下利矣。
治发热下利效如神。
葛根（半斤） 甘草（二两，炙） 黄芩（三两） 黄连（三两） 上四味，以水八升，先煮葛根，减二升，纳诸
药，煮取二升，去渣，分温再服。
太阳病，桂枝症，桂枝症，即太阳伤风之正病也。医反下之，大误。利遂不止，邪下陷，则利无止时。脉
促者，表未解也。促有数意，邪犹在外，尚未陷入之阴，而见沉微等象，故不用理中等法。喘而汗出者，葛
根黄芩黄连汤主之。因表未解，故用葛根，因喘汗而利，故用芩连之苦以泄之、坚之。
芩、连、甘草，为治利之主药。
葛根（四两） 麻黄（三两，去掉节） 芍药（二两） 生姜（三两，切片） 甘草（二两，蜜炙） 桂枝（三两，去掉皮） 大枣（十二枚，掰开） 以上七味药，用水一斗，先煮麻黄和葛根这两味主药。水量减少二升，撇去上面的浮沫，加入其余药物，煎煮取三升药液，滤去药渣，温服一升，服药后覆盖衣被使身体微微出汗，不需要喝热粥，因为已经发过汗了。其余调养方法和禁忌事项参照桂枝汤的规定。
太阳病（太阳经受邪所致的病证），出现项背部僵硬拘急不适，无汗，怕风，用葛根汤主治。
前面桂枝加葛根汤这一条，其表现症状也相同，但那里说“反而有汗出”，所以没有麻黄。这里说“无汗”，所以加了麻黄。
阳明病（阳明经受邪所致的病证）的症状是汗出且怕热，现在是无汗且怕风，说明病邪尚未完全传入阳明经，所以称为太阳病。
按语：葛根，《本草》记载能治疗身体大热。大热是阳明病的症状，因为太阳病即将传入阳明经，所以加入这味药。
太阳经与阳明经同时受邪的合病（两经或三经同时发病），必然出现自发性腹泻，用葛根汤主治。合病的判断全在于对腹泻这一症状的分析，大概是因为风邪侵入胃腑导致腹泻。
治疗发热伴腹泻效果神效。
葛根（半斤） 甘草（二两，蜜炙） 黄芩（三两） 黄连（三两） 以上四味药，用水八升，先煮葛根，水量减少二升，加入其余药物，煎煮取二升药液，滤去药渣，分两次温服。
太阳病，出现桂枝汤证（太阳中风表虚证），桂枝汤证即太阳伤风的典型病症。医生反而使用攻下法，这是大大的错误。腹泻随即不止，邪气内陷，那么腹泻就没有停止的时候。脉象急促的，说明表证未解。促脉有数急之意，邪气仍在体表，尚未陷入阴分而见到沉微等脉象，所以不用理中汤等温里之法。气喘且出汗的，用葛根黄芩黄连汤主治。因为表证未解，所以用葛根；因为气喘、出汗且腹泻，所以用黄芩、黄连的苦寒之性来清泄热邪、坚固肠胃。
This is precisely Guizhi Tang (Cinnamon Twig Decoction) with the addition of Sanliang (1.5 oz) of Mahuang (Ephedrae Herba) and Siliang (2 oz) of Gegen (Puerariae Lobatae Radix).
Gegen (Puerariae Lobatae Radix, 4 liang), Mahuang (Ephedrae Herba, 3 liang, remove nodes), Shaoyao (Paeoniae Radix Alba, 2 liang), Shengjiang (Zingiberis Rhizoma Recens, 3 liang, sliced), Gancao (Glycyrrhizae Radix et Rhizoma, 2 liang, honey-fried), Guizhi (Cinnamomi Ramulus, 3 liang, remove bark), Dazao (Jujubae Fructus, 12 pieces, split). The above seven ingredients are decocted in one dou (approx. 2 liters) of water. First, boil Mahuang and Gegen, the two principal herbs. Reduce the volume by two sheng (approx. 0.4 liters), skim off the foam on the surface, then add the remaining herbs. Boil until three sheng (approx. 0.6 liters) remain, strain to remove dregs, and take one sheng (approx. 0.2 liters) warm. Cover with blankets to induce a slight sweat. There is no need to drink hot porridge afterwards, as sweating has already been induced. Rest and dietary precautions follow those for Guizhi Tang.
In Taiyang disease (disease of the Taiyang channel), characterized by stiffness and tightness in the nape and back, absence of sweat, and aversion to wind, Gegen Tang (Kudzu Root Decoction) is indicated.
The previous entry regarding Guizhi Jia Gegen Tang (Guizhi Tang plus Kudzu Root Decoction) presents identical symptoms, but it states "sweating occurs," hence Mahuang is omitted. Here, it states "no sweat," hence Mahuang is added.
Yangming disease (disease of the Yangming channel) typically presents with sweating and aversion to heat. Since the current case involves no sweat and aversion to wind, the pathogen has not fully entered the Yangming channel; therefore, it is classified as Taiyang disease.
Note: According to Bencao (Materia Medica), Gegen treats severe body heat. Severe heat is a symptom of Yangming disease. Since the Taiyang condition is about to transition into the Yangming channel, this herb is added.
When Taiyang and Yangming channels are simultaneously affected (Hebing / Combined Disease), spontaneous diarrhea will inevitably occur. Gegen Tang is indicated. The diagnosis of Hebing relies entirely on assessing the symptom of diarrhea, as wind-pathogen invading the stomach leads to diarrhea.
It is highly effective in treating fever accompanied by diarrhea.
Gegen (Puerariae Lobatae Radix, half jin [8 liang]), Gancao (Glycyrrhizae Radix et Rhizoma, 2 liang, honey-fried), Huangqin (Scutellariae Radix, 3 liang), Huanglian (Coptidis Rhizoma, 3 liang). The above four ingredients are decocted in eight sheng (approx. 1.6 liters) of water. First, boil Gegen until the volume reduces by two sheng. Then add the remaining herbs and boil until two sheng remain. Strain to remove dregs and divide into two warm doses.
Taiyang disease presenting with Guizhi syndrome (Taiyang Wind-Strike deficiency pattern), which is the typical presentation of Taiyang wind-strike, was mistakenly treated with purgatives by the physician. This was a major error. Consequently, diarrhea persisted uncontrollably because the pathogen sank inward. If the pulse is Cu (Rapid/Agitated), it indicates that the exterior syndrome remains unresolved. A Cu pulse implies rapidity; the pathogen is still at the exterior and has not yet sunk into the Yin levels where Chen (Deep) or Wei (Minute) pulses would appear. Therefore, Lizhong Tang (Regulate the Middle Decoction) is not used. For cases involving wheezing and sweating accompanied by diarrhea, Gegen Huangqin Huanglian Tang (Kudzu Root, Scutellaria, and Coptis Decoction) is indicated. Because the exterior is unresolved, Gegen is used; because of wheezing, sweating, and diarrhea, the bitter-cold properties of Huangqin and Huanglian are employed to clear heat and firm the intestines.
Huangqin, Huanglian, and Gancao constitute the principal herbs for treating diarrhea.