Bai Hu Jia Cang Zhu Tang

White Tiger Plus Atractylodes Decoction · 白虎加蒼朮湯

Also known as: Cang Zhu Bai Hu Tang (苍术白虎汤), Bai Hu Cang Zhu Tang (白虎苍术汤), Bai Hu Jia Cang Tang (白虎加苍汤)

A classical formula that clears internal Heat while simultaneously resolving Dampness. It is used when Heat and Dampness combine in the body, causing symptoms such as fever, heavy body sensation, chest stuffiness, excessive sweating, joint pain, and thirst. It builds on the famous White Tiger Decoction by adding Cang Zhu to dry Dampness.

Origin Lei Zheng Huo Ren Shu (類證活人書), Volume 18, by Zhu Gong (朱肱) — Sòng dynasty, 1108 CE
Composition 5 herbs
Shi Gao
King
Shi Gao
Zhi Mu
Deputy
Zhi Mu
Cang Zhu
Deputy
Cang Zhu
Jing Mi
Assistant
Jing Mi
Gan Cao
Envoy
Gan Cao
Explore composition

Educational content Consult qualified TCM practitioners for diagnosis and treatment

Patterns Addressed

In TCM, symptoms don't appear randomly — they cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Bai Hu Jia Cang Zhu Tang is designed to correct these specific patterns.

Why Bai Hu Jia Cang Zhu Tang addresses this pattern

When Dampness and Heat combine in the body, the Heat blazes in the Qi level while Dampness obstructs the Spleen and clings to the muscles, joints, and chest. This creates a complex picture: the Heat produces high fever, thirst, and sweating, while the Dampness causes body heaviness, chest fullness, and sometimes cold extremities (because Dampness blocks the flow of Yang Qi to the limbs). Standard Heat-clearing formulas cannot address the Dampness, and standard Dampness-resolving formulas may be too warm. Bai Hu Jia Cang Zhu Tang solves this by using Shi Gao and Zhi Mu to powerfully clear the Heat, while Cang Zhu dries the Dampness and strengthens the Spleen. The formula treats both pathogenic factors simultaneously without worsening either one.

A practitioner would look for one or more of these signs

Fever

High fever that does not resolve with sweating

Excessive Sweating

Profuse sweating, especially of the head and chest

Stifling Sensation In The Chest

Chest stuffiness and a sense of oppression

Heavy Sensation In The Head

Body heaviness, limbs feel heavy and difficult to move

Thirst

Thirst with desire to drink

Moving Pain

Generalized body and joint pain

Commonly Prescribed For

These conditions can arise from the patterns above. A practitioner would consider Bai Hu Jia Cang Zhu Tang when these conditions are specifically caused by those patterns — not for all cases of these conditions.

TCM Interpretation

In TCM, rheumatoid arthritis during acute flares is commonly understood as a Wind-Damp-Heat Bi (painful obstruction) syndrome. Wind, Dampness, and Heat invade the channels and joints, blocking the circulation of Qi and Blood. When Heat is the dominant pathogenic factor, the joints become red, swollen, hot, and extremely tender. The Dampness component makes the swelling persistent and the limbs heavy. The Spleen often becomes involved because Dampness easily damages Spleen function, creating a vicious cycle where impaired Spleen Qi generates more internal Dampness. When the Heat is intense enough to affect the whole body, the patient develops fever, thirst, and irritability alongside the joint symptoms.

Why Bai Hu Jia Cang Zhu Tang Helps

Bai Hu Jia Cang Zhu Tang addresses the dual pathology of Heat and Dampness in the joints. Shi Gao and Zhi Mu powerfully clear the Heat that drives the inflammation, redness, and pain, while Cang Zhu directly dries the Dampness that causes the swelling and heaviness. The formula is particularly suited for acute inflammatory flares where Heat signs predominate: joints that are hot to the touch, red, with accompanying fever and thirst. By clearing Heat and drying Dampness simultaneously, the formula tackles both the systemic inflammation and the local joint pathology. Jing Mi and Zhi Gan Cao protect the Stomach and Spleen from the cold herbs, which is important because patients with chronic joint disease often have an underlying Spleen weakness.

Also commonly used for

Rheumatic Fever

When presenting with high fever, joint inflammation, and Dampness signs

Skin Rashes

Measles or other eruptive febrile diseases with Damp-Heat pattern

Diabetes

Type 2 diabetes with prominent Heat and Dampness signs such as thirst, body heaviness, and greasy tongue coating

Urinary Tract Infection

With Damp-Heat signs and systemic fever

What This Formula Does

Every TCM formula has a specific set of actions — here's what Bai Hu Jia Cang Zhu Tang does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Bai Hu Jia Cang Zhu Tang is primarily used to support these areas of health:

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Bai Hu Jia Cang Zhu Tang performs to restore balance in the body:

How It Addresses the Root Cause

TCM doesn't just suppress symptoms — it aims to resolve the underlying imbalance. Here's how Bai Hu Jia Cang Zhu Tang works at the root level.

This formula addresses a condition called Damp-Warmth (湿温, shi wen), in which two distinct pathogenic factors — Heat and Dampness — invade the body simultaneously. This typically occurs in late summer or in hot, humid environments where the body is exposed to both Summer-Heat and Dampness. The Heat component blazes in the Qi level (the Yangming Stomach and Lung systems), producing high fever, thirst, and sweating. At the same time, Dampness — heavy, turbid, and sticky by nature — lodges in the muscles, joints, and Spleen system. It blocks the smooth flow of Qi through the channels, causing a heavy sensation throughout the body, joint pain and swelling, a stifling feeling in the chest, and sometimes cold feet.

The difficulty with Damp-Heat conditions is that these two pathogens require seemingly contradictory treatments. Heat calls for cold, clearing medicines, but Dampness needs warm, drying medicines. Standard cold formulas risk trapping the Dampness by congealing it, while standard drying formulas risk fueling the Heat. The genius of this formula is that it tackles both problems at once: the base Bai Hu Tang structure powerfully clears Qi-level Heat and protects fluids, while the addition of Cang Zhu (Atractylodes) uses its warm, acrid, bitter nature to dry and transform the Dampness without interfering with the Heat-clearing action. The Dampness is resolved so it no longer obstructs the channels and Middle Burner, while the Heat is cleared so it no longer scorches the fluids.

Formula Properties

Every formula has an inherent temperature, taste, and affinity for specific organs — these properties determine how it interacts with the body

Overall Temperature

Cold

Taste Profile

Predominantly acrid, sweet, and bitter — acrid to disperse and clear Heat, bitter to dry Dampness, sweet to protect the Stomach and generate fluids.

Channels Entered

Ingredients

5 herbs

The herbs that make up Bai Hu Jia Cang Zhu Tang, organized by their role in the prescription

King — Main ingredient driving the formula
Deputy — Assists and enhances the King
Assistant — Supports or moderates other herbs
Envoy — Directs the formula to its target
King — Main ingredient driving the formula
Shi Gao

Shi Gao

Gypsum

Dosage 30 - 50g
Temperature Cold
Taste Pungent, Sweet
Organ Affinity Lungs, Stomach
Preparation Crush and decoct first for 20-30 minutes (先煎)

Role in Bai Hu Jia Cang Zhu Tang

The principal herb of this formula. Shi Gao is acrid, sweet, and very cold, entering the Lung and Stomach channels. It powerfully clears intense Heat from the Qi level (the Yangming system), resolves high fever, and relieves irritability and thirst. Used in a large dose to match the severity of the Heat.
Deputies — Assists and enhances the King
Zhi Mu

Zhi Mu

Anemarrhena rhizomes

Dosage 9 - 18g
Temperature Cold
Taste Bitter, Sweet
Organ Affinity Kidneys, Lungs, Stomach

Role in Bai Hu Jia Cang Zhu Tang

Assists Shi Gao in clearing Heat from the Lung and Stomach while also nourishing Yin and generating fluids. Its bitter, cold, and moist nature helps prevent the drying damage that intense Heat causes to the body's fluids. Together with Shi Gao, the pair powerfully clears Qi-level Heat while protecting Yin.
Cang Zhu

Cang Zhu

Black atractylodes rhizomes

Dosage 6 - 9g
Temperature Warm
Taste Bitter, Pungent
Organ Affinity Spleen, Stomach

Role in Bai Hu Jia Cang Zhu Tang

The key addition that distinguishes this formula from Bai Hu Tang. Cang Zhu is acrid, bitter, and warm, entering the Spleen and Stomach channels. It strongly dries Dampness and strengthens Spleen function. In this formula, it directly addresses the Dampness component of the Damp-Heat pattern while its aromatic, dispersing nature helps transform turbid Dampness that the cold, clearing herbs alone cannot resolve.
Assistant — Supports or moderates other herbs
Jing Mi

Jing Mi

Rice sprouts

Dosage 9 - 15g
Temperature Neutral
Taste Sweet
Organ Affinity Spleen, Stomach

Role in Bai Hu Jia Cang Zhu Tang

Protects the Stomach and Spleen from damage by the cold nature of Shi Gao and Zhi Mu. Rice nourishes Stomach Qi, helps generate fluids, and serves as a natural buffer that prevents the formula's strongly cold herbs from injuring the digestive system.
Envoy — Directs the formula to its target
Gan Cao

Gan Cao

Liquorice

Dosage 3 - 6g
Temperature Neutral
Taste Sweet
Organ Affinity Heart, Lungs, Spleen, Stomach

Role in Bai Hu Jia Cang Zhu Tang

Harmonizes all the herbs in the formula. Honey-prepared Licorice root tonifies the middle burner, protects Stomach Qi, and moderates the strongly cold nature of Shi Gao and Zhi Mu. It works together with Jing Mi to safeguard the Spleen and Stomach, and when paired with Shi Gao, their sweet and cold combination helps generate fluids.

Why This Combination Works

How the herbs in Bai Hu Jia Cang Zhu Tang complement each other

Overall strategy

This formula addresses a condition where Heat and Dampness coexist in the body. The core strategy is to clear intense Heat from the Qi level while simultaneously drying and transforming the Dampness that complicates the pattern. The base White Tiger Decoction provides the powerful Heat-clearing foundation, while the addition of Cang Zhu directly targets the Dampness component that the cold herbs alone cannot resolve.

King herbs

Shi Gao (Gypsum) is the King herb, used in large doses for its powerful ability to clear blazing Heat from the Yangming (Stomach and Large Intestine) system. Its acrid and sweet flavour combined with its very cold nature allows it to both purge interior Heat and generate fluids. It targets the high fever, intense thirst, and profuse sweating that characterize Heat in the Qi level.

Deputy herbs

Zhi Mu (Anemarrhena Rhizome) serves as the first Deputy, directly assisting Shi Gao in clearing Lung and Stomach Heat. Its moist, bitter-cold quality adds an important Yin-nourishing dimension that Shi Gao lacks, helping to restore fluids damaged by the intense Heat. Together, Shi Gao and Zhi Mu form a classical herb pair with mutually reinforcing effects. Cang Zhu (Atractylodes Rhizome) is the second Deputy and the defining addition of this formula. Its warm, acrid, and bitter properties directly oppose Dampness by drying it from the Spleen and transforming it from the muscles and joints. Although warm in nature, it is restrained by the strongly cold Shi Gao and Zhi Mu, so it does not generate Heat.

Assistant herbs

Jing Mi (Rice) is a reinforcing Assistant that protects the Stomach from the cold nature of Shi Gao and Zhi Mu. It nourishes Stomach Qi and generates fluids, preventing the cold medicinals from damaging the digestive system.

Envoy herbs

Zhi Gan Cao (Honey-prepared Licorice Root) harmonizes the entire formula, coordinates the drastically different thermal natures of the cold clearing herbs and the warm drying herb, and protects the middle burner. Paired with Shi Gao, its sweet flavour helps generate fluids through a sweet-cold combination.

Notable synergies

The Shi Gao and Zhi Mu pairing is one of the most celebrated in Chinese medicine for clearing Qi-level Heat while protecting Yin. The Cang Zhu and Shi Gao pairing is the central innovation of this formula: Cang Zhu's warm drying power addresses Dampness while Shi Gao's intense cold restrains Cang Zhu from becoming overly warm. Together they can clear Heat and dry Dampness simultaneously, which neither could accomplish alone. The Jing Mi and Zhi Gan Cao combination protects the Stomach from both the cold clearing and warm drying actions.

How to Prepare

Traditional preparation instructions for Bai Hu Jia Cang Zhu Tang

Crush the herbs coarsely. Shi Gao (Gypsum) should be broken into small pieces and decocted first for 20 to 30 minutes before the other herbs are added. Then add all remaining herbs and Jing Mi (rice) with approximately 1000 ml of water, and decoct until the rice is fully cooked and the liquid has reduced to about 300 to 400 ml. Strain and remove the dregs. Divide into 2 to 3 portions and take warm throughout the day. If fever subsides, reduce the dose or discontinue. Do not continue long-term once heat signs have resolved.

Common Modifications

How practitioners adapt Bai Hu Jia Cang Zhu Tang for specific situations

Added
Gui Zhi

6-9g, opens the channels and promotes circulation of Qi through painful joints

Ren Dong Teng

15-30g, clears Heat from the channels and relieves joint pain

Gui Zhi opens the channels to allow the formula's Heat-clearing and Dampness-drying actions to reach the affected joints. Ren Dong Teng specifically clears Heat from the channels and is commonly used for hot, painful obstruction patterns.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herbal formula.

Contraindications

Situations where Bai Hu Jia Cang Zhu Tang should not be used or requires extra caution

Avoid

Exterior pattern (表证) not yet resolved: when there is fever without sweating, no thirst, and a floating pulse, indicating the pathogen has not yet entered the interior. Using this cold formula prematurely can trap the pathogen.

Avoid

True Cold with false Heat (真寒假热/阴盛格阳): when the patient appears hot on the surface but the underlying condition is one of Yang deficiency and internal Cold. This formula's strongly cold nature would further damage Yang.

Avoid

Blood deficiency fever (血虚发热): when fever is due to Blood deficiency rather than excess Heat. The pulse may feel large (洪) but is forceless on heavy pressure. This formula clears excess Heat and would further deplete a deficient patient.

Avoid

Qi deficiency fever (气虚发热) or Yin deficiency tidal fever (阴虚潮热): these conditions require tonification rather than strong clearing. Shi Gao's cold, heavy nature would injure Spleen and Stomach Qi further.

Avoid

Cold-Dampness patterns (寒湿证) without Heat: when Dampness is combined with Cold rather than Heat, the strongly cold Shi Gao and Zhi Mu are inappropriate. Cang Zhu alone cannot counterbalance them in a Cold-Damp scenario.

Caution

Spleen and Stomach Yang deficiency with chronic loose stools: the large dose of cold Shi Gao can further impair digestive function. Use with caution and reduce dosage if any digestive weakness is present.

Caution

Patients who are elderly, constitutionally weak, or recently post-illness: the formula is strongly clearing and should be used in reduced doses with careful monitoring, stopping as soon as the Heat recedes.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe for short-term use during pregnancy when clearly indicated for acute Damp-Heat conditions. The formula contains no known abortifacient or uterine-stimulating herbs. However, Shi Gao (Gypsum) is very cold in nature and Cang Zhu is warm and drying — both properties should be used cautiously in pregnancy. The strongly cold nature of high-dose Shi Gao may potentially affect the Spleen and Stomach, which are particularly vulnerable during pregnancy. A qualified practitioner should supervise use, keep the course short, and stop as soon as symptoms resolve.

Breastfeeding

No specific contraindication during breastfeeding has been traditionally documented for this formula. The herbs are unlikely to cause significant concern through breast milk transfer in short-term use. However, Shi Gao (Gypsum) is extremely cold in nature, and prolonged use could theoretically affect the nursing mother's Spleen and Stomach function, potentially reducing the quality or quantity of breast milk. Cang Zhu is drying and could contribute to reduced fluid production if used excessively. If the formula is clearly indicated for an acute Damp-Heat condition in a breastfeeding mother, short-term use under practitioner supervision is reasonable. Monitor the infant for any signs of digestive upset such as loose stools or decreased feeding.

Children

This formula can be used in children for appropriate Damp-Heat conditions such as summer fever (夏季热) with body heaviness. Dosage should be reduced according to the child's age and weight — typically one-third to one-half of the adult dose for children aged 6–12, and one-quarter for children under 6. The classical text itself notes "小儿减半" (reduce by half for children) for the parent Bai Hu Tang. Because Shi Gao is strongly cold, special care must be taken not to injure the immature Spleen and Stomach of young children. The course should be kept as short as possible, and the formula should be stopped promptly once fever subsides and Damp-Heat signs resolve. Not suitable for infants under 1 year without specialist supervision.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Bai Hu Jia Cang Zhu Tang

Gan Cao (Glycyrrhiza/Licorice): Contains glycyrrhizin, which can cause pseudoaldosteronism (sodium retention, potassium loss, elevated blood pressure). May interact with antihypertensive medications, diuretics (especially potassium-depleting types like furosemide or hydrochlorothiazide), cardiac glycosides (digoxin — hypokalemia increases toxicity risk), corticosteroids (additive potassium depletion), and anticoagulants (warfarin). Patients on these medications should be monitored.

Shi Gao (Gypsum/Calcium sulfate): As a calcium-containing mineral, Shi Gao may theoretically reduce the absorption of tetracycline antibiotics, fluoroquinolone antibiotics (ciprofloxacin, levofloxacin), bisphosphonates, and levothyroxine if taken simultaneously. A gap of at least 2 hours between ingestion of this formula and these medications is advisable.

Zhi Mu (Anemarrhena): Has demonstrated hypoglycemic effects in pharmacological studies. Patients taking insulin or oral hypoglycemic agents (metformin, sulfonylureas) should monitor blood sugar levels closely, as additive effects could increase the risk of hypoglycemia.

Usage Guidance

Practical advice for getting the most out of Bai Hu Jia Cang Zhu Tang

Best time to take

Warm, 2–3 times daily between meals (about 1 hour after eating), with the rice in the decoction cooked until soft.

Typical duration

Acute use: 3–7 days, reassessed daily; stop as soon as fever recedes and Damp-Heat signs resolve.

Dietary advice

Avoid greasy, oily, and fried foods, as these generate further Dampness and impede recovery. Avoid raw and cold foods (ice cream, cold salads, iced drinks), which can injure the Spleen and trap Dampness. Avoid alcohol and spicy-hot foods (chili, pepper, lamb), which aggravate internal Heat. Favor light, easily digestible foods such as plain rice porridge (congee), mung bean soup, winter melon, barley water (yi yi ren), and cucumber, which support Dampness resolution and fluid balance. Adequate hydration with room-temperature or warm water is important, as the formula addresses both Heat and fluid damage.

Bai Hu Jia Cang Zhu Tang originates from Lei Zheng Huo Ren Shu (類證活人書), Volume 18, by Zhu Gong (朱肱) Sòng dynasty, 1108 CE

Classical Texts

Key passages from the classical Chinese medical texts that first described Bai Hu Jia Cang Zhu Tang and its clinical use

《类证活人书》(Lei Zheng Huo Ren Shu) by Zhu Gong (朱肱), Volume 18:
「白虎加苍术汤,治湿温多汗。知母六两,甘草(炙)二两,石膏一斤,苍术三两,粳米三两。」
"Bai Hu Jia Cang Zhu Tang, treats Damp-Warmth with profuse sweating. Zhi Mu 6 liang, Gan Cao (honey-fried) 2 liang, Shi Gao 1 jin, Cang Zhu 3 liang, Jing Mi 3 liang."

《温病条辨》(Wen Bing Tiao Bian) by Wu Jutong (吴鞠通), Volume 1, Article 26:
「手太阴暑温,或已经发汗,或未发汗,而汗不止,烦渴而喘,脉洪大有力者,白虎汤主之。脉洪大而芤者,白虎加人参汤主之。身重者湿也,白虎加苍术汤主之。」
"For Hand Taiyin Summer-Warmth, whether sweating has been induced or not, when sweating does not stop, with restless thirst and wheezing, and the pulse is flooding and forceful, Bai Hu Tang governs. When the pulse is flooding but hollow, Bai Hu Jia Ren Shen Tang governs. When there is heaviness of the body, this is Dampness — Bai Hu Jia Cang Zhu Tang governs."

《医方考》(Yi Fang Kao) by Wu Kun (吴昆):
「温毒藏于肌肤,更遇于湿,名曰湿温。湿为阴邪,故憎寒;温为阳邪,故壮热;温热入里,故口渴;湿流百节,故一身尽痛;湿为阴,故脉沉细。石膏、知母、甘草、粳米,白虎汤也,所以解温热;加苍术者,取其辛燥能治湿也。」
"When warm toxin hides in the flesh and skin, and additionally encounters Dampness, this is called Damp-Warmth. Dampness is a Yin pathogen, so there is aversion to cold; Warmth is a Yang pathogen, so there is vigorous fever; when warm-heat enters the interior, there is thirst; when Dampness flows through all the joints, the whole body aches; Dampness is Yin, so the pulse is deep and fine. Shi Gao, Zhi Mu, Gan Cao, and Jing Mi form Bai Hu Tang, which resolves the warm-heat; adding Cang Zhu exploits its acrid, drying nature to treat the Dampness."

Historical Context

How Bai Hu Jia Cang Zhu Tang evolved over the centuries — its origins, lineage, and place in the broader tradition of Chinese medicine

Bai Hu Jia Cang Zhu Tang was first recorded in the Lei Zheng Huo Ren Shu (类证活人书, "Systematic Differentiation of Warm Diseases for Saving Lives"), written by the Northern Song dynasty physician Zhu Gong (朱肱, c. 1050–1125), also known by his courtesy name Zhu Yizhong (朱翼中) and his literary name Wuqiuzi (无求子). The text was completed in 1108 and was one of the earliest important commentaries on Zhang Zhongjing's Shang Han Lun. Zhu Gong created this formula by adding a single herb — Cang Zhu (Atractylodes) — to the classical Bai Hu Tang from the Shang Han Lun, specifically to address cases where Heat and Dampness appear together.

The formula gained further prominence through Wu Jutong's (吴鞠通) Wen Bing Tiao Bian (温病条辨, 1798), where it was specified for Summer-Warmth patterns with body heaviness indicating Dampness. This placed the formula firmly within the Warm Disease (温病) school's clinical repertoire. The formula also appears under several alternative names across different texts: Cang Zhu Bai Hu Tang (苍术白虎汤) in Liu Wansu's Xuan Ming Lun, and Bai Hu Cang Zhu Tang (白虎苍术汤) in Bao Ying Cuo Yao. A notable historical medical case is recorded by the original author: in a guichou year, his friend Wang Yanlong developed Damp-Warmth during late summer with sweating of the chest and neck, cold feet, and delirium. After sequential treatment with Bai Hu Jia Ren Shen Tang followed by Bai Hu Jia Cang Zhu Tang, the patient recovered in three days.