治伤寒大汗出后表证已解心胸大烦渴欲饮水及吐或下后七八日邪毒不解热结在里表
热时时恶风大渴舌上干燥而烦欲饮水数升者宜服之又治夏月中暑毒汗出恶寒身热而渴
知母（六两苦寒） 石膏（一斤碎甘寒） 甘草（二两炙甘平） 粳米（六合甘平）
上四味以水一斗煮米熟汤成去滓温服一升日三服
按成无己云白虎西方金神也应秋而归肺热甚于内者以寒下之热甚于外者以凉解之其有中
外俱热内不得泄外不得发者非此汤则不能解之也又云内经曰热淫所胜佐以苦甘知母石膏之苦
甘以散热热则伤气甘以缓之甘草粳米之甘以益气
即白虎汤加人参（三两）治太阳中 汗出恶寒身热而渴此治动而伤暑大渴者活
汤
即白虎汤加桂治中暑自汗微恶寒者又治温疟其脉如平身无寒但热骨节疼烦时
即白虎汤去知母加竹叶（二把）半夏（半升）洗麦门冬（一升）去心人参（三两）治伤
寒解后虚
羸少气气逆欲吐者竹叶石膏甘草之甘辛以发散余热麦门冬人参粳米之甘以补不足半
散气逆
治疗伤寒大汗出之后，表证已经解除，但心胸极度烦闷、口渴想喝水，以及呕吐或腹泻后七八天，邪毒仍未解除，热邪结聚在体内，体表发热且时常怕风，极度口渴，舌面干燥而烦躁，想要喝几升水的情况，适宜服用此方。又用于治疗夏季中暑，因暑毒导致出汗、怕冷、身体发热且口渴的症状。
知母（六两，味苦性寒） 石膏（一斤，捣碎，味甘性寒） 甘草（二两，蜜炙，味甘性平） 粳米（六合，味甘性平）
以上四味药，用水一斗，煮至米熟汤成，滤去药渣，温服一升，每日三次。
按语：成无己说，白虎对应西方金神，应合秋季之气而归肺经。热邪盛于体内的，用寒凉攻下的方法；热邪盛于体表的，用清凉解表的方法。其中如果有内外俱热，内部无法宣泄、外部无法发散的情况，不用这个汤剂就不能解除病邪。他又引用《内经》说：“热邪过胜，以苦甘之品佐助。”知母和石膏的苦甘之性可以散热，热邪会耗伤气机，甘味可以缓和它，甘草和粳米的甘味可以补益正气。
即白虎汤加入人参（三两），治疗太阳中暍（中暑），症状为汗出、怕冷、身体发热且口渴。这是治疗因活动而伤暑、极度口渴的活人汤。
即白虎汤加入桂枝，治疗中暑自汗、轻微怕冷的情况。又用于治疗温疟，其脉象如常人，身体没有恶寒只有发热，骨节疼痛烦扰，时时发作。
即白虎汤去掉知母，加入竹叶（二把）、半夏（半升，洗净）、麦门冬（一升，去心）、人参（三两），治疗伤寒解除后，身体虚弱消瘦、气短、气逆欲吐的情况。竹叶、石膏、甘草的甘辛之性可以发散余热，麦门冬、人参、粳米的甘味可以补益不足，半夏可以散除气逆。
Indicated for cases where, after profuse sweating in Taiyang disease (Taiyang syndrome), the exterior syndrome has resolved, yet there is extreme restlessness and thirst in the chest and heart, desiring to drink water, accompanied by vomiting or following diarrhea. After seven or eight days, if pathogenic factors remain unresolved, heat accumulates internally while the exterior shows heat with occasional aversion to wind, severe thirst, a dry tongue, irritability, and a desire to drink several sheng of water, this formula is appropriate. It is also indicated for summerheat-stroke caused by toxic summerheat during summer, presenting with sweating, aversion to cold, fever, and thirst.
Zhimu (Anemarrhenae Rhizoma, 6 liang, bitter, cold) Shigao (Gypsum Fibrosum, 1 jin, crushed, sweet, cold) Gancao (Glycyrrhizae Radix et Rhizoma Preparatum cum Melle, 2 liang, honey-fried, sweet, neutral) Jingmi (Oryza Sativa, 6 he, sweet, neutral)
Take the above four ingredients, boil in one dou of water until the rice is cooked and the decoction is ready, strain, and take one sheng warm, three times daily.
Commentary: Cheng Wuji stated that Baihu corresponds to the Metal spirit of the West, aligning with autumn and relating to the Lung. When heat is excessive internally, use cold purgatives; when heat is excessive externally, use cooling dispersants. However, when there is heat both inside and out, unable to be vented internally or released externally, no other formula can resolve it but this one. He further cited the *Neijing*: "When heat is rampant, assist with bitter and sweet." The bitter and sweet properties of Zhimu and Shigao dissipate heat. Since heat damages Qi, the sweet property moderates it; the sweetness of Gancao and Jingmi tonifies Qi.
This is Baihu Tang added with Renshen (3 liang), indicated for Taiyang Zhongshu (summerheat-stroke affecting the Taiyang channel), presenting with sweating, aversion to cold, fever, and thirst. This treats active summerheat injury with severe thirst, known as Huo Tang.
This is Baihu Tang added with Cangzhu (2 liang), indicated for passive summerheat injury without thirst.
This is Baihu Tang added with Guizhi, indicated for summerheat-stroke with spontaneous sweating and slight aversion to cold. It is also indicated for Wenmian (warm malaria), where the pulse appears normal, there is no chills but only fever, joint pain and irritability, occurring intermittently.
This is Baihu Tang added with Shanzhizi, indicated for strangury with restlessness and thirst.
This is Baihu Tang added with Wuweizi, indicated for cough with scanty body fluids.
This is Baihu Tang minus Zhimu, plus Zhuye (2 bundles), Banxia (0.5 sheng, washed), Maidong (1 sheng, heart removed), and Renshen (3 liang). It treats post-febrile weakness, emaciation, shortness of breath, and rebellious Qi leading to retching. The sweet and acrid properties of Zhuye, Shigao, and Gancao disperse residual heat; the sweet properties of Maidong, Renshen, and Jingmi tonify deficiency; Banxia disperses rebellious Qi.
This is Baihu Tang minus Gancao and Jingmi, added with Baizhi (1 liang), indicated for malaria with more heat than chills, where slight pathogenic factors remain after purgation/diarrhea.
This is Baihu Tang minus Gancao and Jingmi, added with Guizhi and Huangqin, indicated for malaria without other symptoms, alternating every other day, starting with chills followed by fever, with less chills and more heat.