Gan Mai Da Zao Tang

Licorice, Wheat, and Jujube Decoction · 甘麦大枣汤

Also known as: Gan Cao Xiao Mai Da Zao Tang (甘草小麦大枣汤, Licorice, Wheat, and Jujube Decoction)

A gentle, sweet-tasting classical formula with just three everyday ingredients, used to calm the mind, ease emotional distress, and relieve restlessness. It is especially helpful for people experiencing unexplained sadness, crying spells, anxiety, irritability, or sleep difficulties linked to emotional strain or hormonal changes such as menopause.

Origin Jin Gui Yao Lue (Essential Prescriptions from the Golden Cabinet) by Zhang Zhongjing — Eastern Hàn dynasty, ~200 CE
Composition 3 herbs
Xiao Ji
King
Xiao Ji
Gan Cao
Deputy
Gan Cao
Da Zao
Assistant
Da Zao
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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. Gan Mai Da Zao Tang is designed to correct these specific patterns.

Why Gan Mai Da Zao Tang addresses this pattern

When Heart Yin is depleted, the Heart loses its material basis for housing the spirit (Shen). Without adequate Yin to anchor and cool the spirit, a person may experience mental restlessness, anxiety, insomnia, and a vague inner agitation. Gan Mai Da Zao Tang addresses this by using Xiao Mai to directly nourish Heart Yin and clear deficiency heat, while Gan Cao and Da Zao support Blood and fluid production from the Spleen, ensuring the Heart receives ongoing nourishment. The formula's gentle, sweet, moistening quality is ideally suited to replenish Yin without introducing harsh or drying properties.

A practitioner would look for one or more of these signs

Insomnia

Difficulty falling or staying asleep due to a restless mind

Anxiety

Persistent unease and mental agitation

Severe Heart Palpitations

Palpitations or fluttering sensation, worse with emotional stress

Night Sweats

Night sweats from Yin deficiency heat

Irritability

Restless irritability with a feeling of inner heat

Commonly Prescribed For

These conditions can arise from the patterns above. A practitioner would consider Gan Mai Da Zao Tang when these conditions are specifically caused by those patterns — not for all cases of these conditions.

Arises from: Heart Yin Deficiency Disharmony of the Heart and Liver

TCM Interpretation

In TCM, the menopausal transition is understood as a natural decline of Kidney Essence and Yin. As Kidney Yin diminishes, it can no longer adequately nourish the Heart (the Water-Fire axis between Kidney and Heart weakens) or sustain the Liver's Blood supply. The Heart, deprived of Yin, generates deficiency heat that disturbs the spirit, causing hot flushes, anxiety, and insomnia. The Liver, insufficiently nourished by Blood and Yin, loses its ability to regulate emotions smoothly, leading to irritability, sudden crying, and mood swings. The pattern closely mirrors the classical description of Zang Zao.

Why Gan Mai Da Zao Tang Helps

Gan Mai Da Zao Tang directly targets the emotional and spiritual disturbance central to menopausal symptoms. Xiao Mai nourishes Heart Yin and calms the spirit, addressing the anxiety, insomnia, and inner restlessness. Gan Cao relaxes Liver tension and eases the emotional volatility. Da Zao moistens and nourishes, supporting the body's depleted fluids and Blood. Clinical reports have shown effectiveness in relieving menopausal hot flushes, insomnia, and emotional instability. For more pronounced symptoms, practitioners commonly add Mai Men Dong (Ophiopogon) for Yin deficiency heat, or Suan Zao Ren (sour jujube seed) for severe insomnia.

Also commonly used for

Insomnia

Difficulty sleeping due to emotional strain or Heart-Spleen deficiency

Hysteria

Conversion disorder / hysteria with dramatic emotional outbursts

Neurasthenia

Nervous exhaustion with emotional instability

Night Terrors In Children

Pediatric night crying and sleep disturbance

Night Sweats

Sweating from Heart Yin deficiency

Premenstrual Syndrome

Emotional volatility and irritability before menstruation

What This Formula Does

Every TCM formula has a specific set of actions — here's what Gan Mai Da Zao Tang does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Gan Mai Da Zao Tang is primarily used to support these areas of health:

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Gan Mai Da Zao 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 Gan Mai Da Zao Tang works at the root level.

The condition this formula addresses is called Zang Zao (脏躁), often translated as "visceral restlessness." It arises when prolonged emotional strain, such as excessive worry, grief, or overthinking, depletes the body's nourishing resources. Specifically, the Heart and Spleen become damaged. The Heart houses the mind and spirit (Shen). When Heart Yin and Heart Qi become insufficient, the spirit loses its anchor, leading to mental restlessness, insomnia, vague anxiety, and an unsettled feeling. The Spleen, as the source of Qi and Blood production, fails to generate enough nourishment to replenish what the Heart needs.

At the same time, the Liver is affected. The Liver governs the smooth flow of emotions. When its Blood and Yin become depleted, it can no longer regulate emotional expression properly. This manifests as uncontrollable sadness, spontaneous weeping, and behavior that seems irrational or out of character, described classically as looking "as if possessed by spirits." The frequent yawning and stretching mentioned in the original text reflect the exhaustion and restless circulation of Qi in a body struggling to maintain equilibrium.

The root cause is therefore one of deficiency rather than excess. The internal organs have become "dried out" (hence the word "Zao," meaning dryness or restlessness), not from external pathogenic Heat, but from the slow consumption of Yin, Blood, and Qi through emotional wear. The formula works by restoring moisture and nourishment to these depleted systems, particularly calming the Heart spirit and gently harmonizing the Liver, while rebuilding the Spleen's capacity to produce Qi and Blood.

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

Neutral

Taste Profile

Predominantly sweet and mild. All three ingredients are sweet-natured, producing a gentle, nourishing, and palatable decoction that calms through sweetness while moistening internal dryness.

Ingredients

3 herbs

The herbs that make up Gan Mai Da Zao 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
King — Main ingredient driving the formula
Xiao Ji

Xiao Ji

Field Thistle Herb

Dosage 15 - 30g
Temperature Cool
Taste Sweet (甘 gān), Bitter (苦 kǔ)
Organ Affinity Heart, Liver

Role in Gan Mai Da Zao Tang

The primary herb in this formula. Xiao Mai is sweet and slightly cool, entering the Heart channel. It nourishes Heart Yin, calms the spirit, and clears vexation heat. The classical text states that wheat is the grain corresponding to the Heart, making it the ideal substance to directly nourish a depleted Heart. It is used in the largest dose to anchor the spirit and address the root cause of restlessness and emotional instability.
Deputy — Assists and enhances the King
Gan Cao

Gan Cao

Licorice root

Dosage 9 - 15g
Temperature Neutral
Taste Sweet (甘 gān)
Organ Affinity Heart, Lungs, Spleen, Stomach

Role in Gan Mai Da Zao Tang

Gan Cao supplements Heart Qi, harmonises the Middle Burner, and relaxes tension and urgency. Its sweet flavour directly addresses the Liver's need for sweetness to relax constraint (a classical principle: the Liver suffers from tension and craves sweetness to soften it). It also supports the Spleen to generate Qi and Blood, providing the material basis for nourishing the Heart.
Assistant — Supports or moderates other herbs
Da Zao

Da Zao

Jujube fruit

Dosage 10 pieces (approximately 20 - 30g)
Temperature Warm
Taste Sweet (甘 gān)
Organ Affinity Spleen, Stomach, Heart
Preparation Split open before decocting

Role in Gan Mai Da Zao Tang

Da Zao is sweet and warm with a moist quality. It tonifies the Middle Burner, benefits Qi, nourishes Blood, and calms the spirit. It works with Gan Cao to strengthen the Spleen and Stomach as the source of Qi and Blood production, and its moistening nature helps relieve the internal dryness that drives the restlessness of Zang Zao.

Why This Combination Works

How the herbs in Gan Mai Da Zao Tang complement each other

Overall strategy

This formula addresses a Heart deprived of nourishment and a Liver that has lost its smooth flow, resulting in emotional volatility and spiritual unrest. The strategy is entirely sweet, gentle, and moistening: rather than forcefully sedating or moving, the formula softly replenishes what has been lost so the spirit naturally settles.

King herbs

Xiao Mai (wheat) is the King herb, used in the largest quantity. Classical teaching holds that wheat is the grain of the Heart, making it uniquely suited to nourish Heart Yin and Qi. By replenishing Heart substance and clearing mild deficiency heat, it directly addresses the root of the spiritual unrest: a Heart too depleted to house the spirit peacefully.

Deputy herbs

Gan Cao (licorice) serves as Deputy by supplementing Heart Qi and relaxing urgency. A key classical principle states that the Liver "craves sweetness to relax its tension." Gan Cao's deep sweetness directly soothes constrained Liver Qi, alleviating the involuntary sadness and crying that arise when the Liver's free-coursing function fails. It also harmonises the Spleen and Stomach, supporting the production of Qi and Blood that the Heart needs.

Assistant herbs

Da Zao (jujube) is a reinforcing Assistant. Its sweet, moist quality tonifies the Middle Burner and nourishes Blood, working alongside Gan Cao to ensure the digestive system generates enough vital substance to replenish the Heart. Its moistening nature is particularly valuable in this formula because internal dryness of the organs (Zang Zao) is the fundamental problem.

Notable synergies

All three herbs are sweet-flavoured, and their combination creates a profoundly nourishing, "sweet and moistening" effect that neither would achieve alone. Gan Cao and Da Zao together strengthen the Spleen's ability to generate Blood, while Xiao Mai directs this nourishment specifically to the Heart. The classical commentary notes that this produces a gentle cycle: when the Heart is nourished, Heart Fire can properly warm the Spleen (Fire generates Earth), which in turn generates more Blood to sustain both Heart and Liver. The formula's simplicity is its genius: three common food-grade substances working in concert to moisten dryness, calm the spirit, and relax tension throughout the organ network.

How to Prepare

Traditional preparation instructions for Gan Mai Da Zao Tang

The original Jin Gui Yao Lue instructions are: combine Gan Cao (three liang), Xiao Mai (one sheng), and Da Zao (ten pieces) with six sheng of water (approximately 1200 ml). Bring to a boil, then simmer slowly until reduced to about three sheng (approximately 600 ml). Strain and divide into three warm doses to be taken throughout the day.

In modern practice, add the three ingredients to about 800-1000 ml of water. Bring to a boil, reduce to low heat and simmer for 30-40 minutes until reduced by roughly half. Strain and take warm in two to three divided doses daily. The decoction is naturally sweet and pleasant-tasting. Split the Da Zao (jujube dates) open before cooking to release their flavour and active constituents.

Common Modifications

How practitioners adapt Gan Mai Da Zao Tang for specific situations

Added
Bai He

15-20g, to nourish Heart Yin and clear deficiency heat

Suan Zao Ren

15-30g, to nourish Liver Blood and calm the spirit for sleep

Bai He and Suan Zao Ren strengthen the formula's spirit-calming action and directly target insomnia from Heart-Liver Yin and Blood deficiency.

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

Contraindications

Situations where Gan Mai Da Zao Tang should not be used or requires extra caution

Caution

Phlegm-Dampness obstruction with symptoms such as acid reflux, borborygmus, epigastric fullness, and especially a thick greasy tongue coating. All three herbs in this formula are tonifying and sweet, which can worsen Dampness accumulation.

Caution

Hypertension or edema. Gan Cao (licorice) at the dosages used in this formula can promote sodium and water retention and may raise blood pressure, particularly with prolonged use.

Caution

Hypokalemia or concurrent use of potassium-depleting diuretics. Gan Cao can promote potassium excretion, potentially worsening low potassium levels.

Caution

Excess-type conditions with Heat or Fire patterns. This formula is designed for deficiency-type emotional disturbance. It is inappropriate for mania or agitation caused by Phlegm-Fire or Liver Fire blazing.

Caution

Diabetes mellitus (use with caution). Gan Cao has glucocorticoid-like effects that can raise blood sugar, and Da Zao is high in natural sugars. Blood glucose should be monitored.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy. Gan Cao (licorice) in this formula may have steroid-like and estrogenic effects, and some research suggests that significant licorice consumption during pregnancy may increase the risk of preterm delivery and stimulate the fetal hypothalamic-pituitary-adrenal axis. At the standard clinical dosages used in this formula (9-18g of Gan Cao), the risk is considered low, but prolonged high-dose use should be avoided. Notably, the famous TCM physician Deng Tietao recorded a case where Gan Mai Da Zao Tang was used successfully during pregnancy for neurosis, and the patient subsequently delivered a healthy infant. A qualified practitioner should supervise any use during pregnancy.

Breastfeeding

Generally considered safe during breastfeeding. All three ingredients (Gan Cao, Xiao Mai, Da Zao) are food-grade substances with a long history of safe dietary use. The classical text Xue Zheng Lun (Blood Pattern Treatise) even draws a parallel between this formula's fluid-generating action and the mechanism of promoting lactation. No adverse effects on breastfed infants have been reported in the literature. However, high-dose or prolonged use of Gan Cao should still be approached with caution due to its potential mineralocorticoid effects. Standard clinical doses are not expected to cause problems.

Children

Gan Mai Da Zao Tang has a long history of pediatric use. The Japanese Kampo classic Ruiju Ho Kogi (類聚方広義) specifically mentions its application for children who cry incessantly. In modern practice, it is commonly used for pediatric night crying (小儿夜啼), childhood anxiety, and minor epilepsy (petit mal seizures). All three ingredients are food-grade and very well tolerated. Dosage should be adjusted by age and body weight: typically one-third to one-half of the adult dose for children aged 3-7, and one-half to two-thirds for children aged 7-14. For young children, the decoction can be sweetened naturally by the Da Zao and is generally palatable without additional flavoring. Long-term use in children has not shown adverse effects such as liver dysfunction, electrolyte disturbance, or drowsiness in reported clinical observations.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Gan Mai Da Zao Tang

Digoxin and other cardiac glycosides: Gan Cao (licorice) in this formula can promote potassium excretion through its mineralocorticoid-like effect. Low potassium increases cardiac sensitivity to digoxin and may provoke digoxin toxicity with arrhythmias. Concurrent use should be avoided or closely monitored.

Potassium-depleting diuretics (furosemide, hydrochlorothiazide): Combined use with Gan Cao may compound potassium loss, increasing the risk of hypokalemia, muscle weakness, and cardiac arrhythmias. Electrolytes should be monitored.

Antihypertensive medications: Gan Cao can cause sodium and water retention, potentially raising blood pressure and counteracting the effects of blood pressure-lowering drugs.

Corticosteroids (hydrocortisone, prednisone): Gan Cao inhibits the metabolic clearance of corticosteroids, raising their blood levels and potentially amplifying side effects such as edema, hypertension, and hypokalemia. Combined use should be avoided.

Warfarin: Licorice may interact with warfarin, potentially reducing its anticoagulant effect and increasing clotting risk.

Hypoglycemic agents (insulin, sulfonylureas): Gan Cao has glucocorticoid-like properties that can promote gluconeogenesis and raise blood sugar, potentially antagonizing the effects of diabetes medications.

MAO inhibitors: Some experts suggest licorice may possess MAO inhibitor-like activity, which could theoretically potentiate the side effects of pharmaceutical MAO inhibitor antidepressants.

Usage Guidance

Practical advice for getting the most out of Gan Mai Da Zao Tang

Best time to take

Warm, divided into 2-3 doses per day, taken between meals or 30 minutes before meals. Can also be sipped as a tea throughout the day.

Typical duration

Often taken for 2-4 weeks initially, then reassessed. Chronic or recurring emotional conditions may require intermittent courses of 1-3 months. Classical sources note that long-term use may be needed for full effect.

Dietary advice

While taking this formula, favor easily digestible, nourishing foods that support the Spleen and Heart: warm congees, lightly cooked vegetables, dates, lotus seeds, and small amounts of whole grains. Avoid greasy, heavy, or excessively rich foods that can generate Dampness and Phlegm, as the sweet nature of this formula already tends toward Dampness production in susceptible individuals. Limit cold, raw foods and iced drinks, which can impair Spleen function. Reduce stimulating substances such as strong coffee, alcohol, and very spicy foods, which can agitate the spirit and counteract the calming effect of the formula. Because this formula addresses emotional disturbance, regular mealtimes and a calm eating environment also support its therapeutic aim.

Gan Mai Da Zao Tang originates from Jin Gui Yao Lue (Essential Prescriptions from the Golden Cabinet) by Zhang Zhongjing Eastern Hàn dynasty, ~200 CE

Classical Texts

Key passages from the classical Chinese medical texts that first described Gan Mai Da Zao Tang and its clinical use

《金匮要略·妇人杂病脉证并治》(Jin Gui Yao Lue, Chapter on Miscellaneous Diseases of Women):
"妇人脏躁,喜悲伤欲哭,象如神灵所作,数欠伸,甘麦大枣汤主之。"
"When a woman has Zang Zao [visceral restlessness], she is prone to sadness and weeping, behaving as if possessed by spirits, and frequently yawning and stretching. Gan Mai Da Zao Tang governs this."

《金匮要略》original formula text:
"甘草三两,小麦一升,大枣十枚。上三味,以水六升,煮取三升,分温三服。亦补脾气。"
"Gan Cao three liang, Xiao Mai one sheng, Da Zao ten pieces. Boil the three ingredients in six sheng of water, reduce to three sheng, divide into three warm doses. It also supplements Spleen Qi."

《金匮要略论注》(Jin Gui Yao Lue Lun Zhu):
"小麦能和肝阴之客热,而养心液,且有消烦利溲止汗之功,故以为君。甘草泻心火而和胃,故以为臣。大枣调胃,而利其上壅之燥,故以为佐。"
"Xiao Mai can harmonize the Liver Yin's lurking Heat while nourishing Heart fluids, and has the ability to relieve irritability, promote urination, and stop sweating, so it serves as the Sovereign. Gan Cao drains Heart Fire and harmonizes the Stomach, serving as the Minister. Da Zao regulates the Stomach and relieves the dryness that congests upward, serving as the Assistant."

《金匮要略心典》(Jin Gui Yao Lue Xin Dian):
"五志生火,动必关心,脏阴既伤,穷必及肾也。小麦为肝之谷,而善养心气;甘草、大枣甘润生阴,所以滋脏器而止其躁也。"
"The five emotions generate Fire, which inevitably involves the Heart. Once the visceral Yin is damaged, ultimately the Kidneys are affected. Wheat is the grain of the Liver and excels at nourishing Heart Qi. Gan Cao and Da Zao are sweet, moist, and Yin-generating, thereby nourishing the organs and stopping restlessness."

Historical Context

How Gan Mai Da Zao Tang evolved over the centuries — its origins, lineage, and place in the broader tradition of Chinese medicine

Gan Mai Da Zao Tang originates from Zhang Zhongjing's Jin Gui Yao Lue (Synopsis of the Golden Chamber), written around 200 CE during the Eastern Han Dynasty. It appears in Chapter 22, "Miscellaneous Diseases of Women" (妇人杂病脉证并治). Despite being placed in the women's section, later physicians recognized that its application extends well beyond gynecology to anyone suffering from emotional disturbance rooted in deficiency.

The formula is remarkable for its radical simplicity. With only three common, food-grade ingredients, it stands as one of the smallest and most gentle prescriptions in the classical canon. The original text includes the intriguing closing note "亦补脾气" ("it also supplements Spleen Qi"), which some textual scholars have argued is a later interpolation. However, the renowned National Master of Chinese Medicine Deng Tietao (邓铁涛) defended this line, pointing out that emotional disorders treated by this formula "inevitably involve Spleen deficiency" and that all three herbs demonstrably nourish the Heart and Spleen together. Deng Tietao also argued against the common interpretation that Zang Zao refers to uterine blood deficiency, instead understanding it as Heart and Spleen damage from emotional taxation.

In modern clinical practice across East Asia, the formula has become one of the most commonly prescribed herbal formulas for depressive disorders. A Taiwanese national health insurance database study found that Gan Mai Da Zao Tang was the single most frequently prescribed formula for patients diagnosed with depression. It is known as Kambakutaisoto (甘麦大枣湯) in Japanese Kampo medicine and Gammckdaecko-tang in Korean medicine. Practitioners often use it as a base formula, combining it with other prescriptions such as Wen Dan Tang, Xiao Yao San, or Suan Zao Ren Tang depending on accompanying symptoms.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Gan Mai Da Zao Tang

1

Meta-analysis of the efficacy and safety of Ganmai Dazao decoction for depression (2014)

Yeung WF, Chung KF, Ng KY, Yu YM, Ziea ET, Ng BF. Journal of Ethnopharmacology, 2014, 153(2): 309-317.

This systematic review searched 16 databases and included 10 RCTs comparing GMDZ (alone or as co-therapy) with antidepressant drugs for depression. Results indicated that GMDZ showed antidepressant therapeutic effects and was associated with fewer adverse drug reactions compared to conventional antidepressants. However, the overall methodological quality of the included studies was generally low, and larger, better-designed trials were recommended.

2

Systematic review and meta-analysis of GMDZ decoction for depression (RCTs, 2014)

Jun JH, Choi TY, Lee JA, Yun KJ, Lee MS. Maturitas, 2014, 79(4): 370-380.

This review identified 13 RCTs from 12 international databases examining GMDZ decoction for various types of depression. The review found that all included RCTs had a high risk of bias. While some individual trials showed benefits for post-stroke depression and as adjuvant therapy, the pooled data did not provide strong evidence of superiority of GMDZ over standard antidepressants for major depression. The authors concluded that higher-quality trials are needed.

3

GABA and 5-HT systems are involved in the anxiolytic effect of GMDZ decoction (preclinical, 2019)

Chen HS, Gu LJ, Yang YX, Guo JY. Frontiers in Neuroscience, 2019, 12: 1043.

This animal study in mice demonstrated that oral GMDZ decoction at multiple dosages over 7 days produced anxiolytic-like effects comparable to diazepam and buspirone in standard behavioral tests (elevated plus maze, light-dark box, marble burying). The anxiolytic mechanism appeared to involve modulation of benzodiazepine-site and serotonin (5-HT) receptors, with no major side effects observed.

4

Antidepressant-like effects of GMDZ via monoamine regulatory pathways (preclinical, 2018)

Huang HL, Lim SL, Lu KH, Sheen LY. Journal of Traditional and Complementary Medicine, 2018, 8(1): 53-59.

This rat study using the forced swimming test found that 21-day oral administration of the combined GMDZ formula significantly reduced immobility time and modulated brain monoamine neurotransmitters, increasing serotonin (5-HT) and dopamine levels while reducing DOPAC turnover. Notably, the individual ingredients (licorice, wheat, and jujube alone) did not produce significant effects, suggesting the formula's efficacy depends on the synergy of all three components together.

5

Major plant in herbal mixture Gan-Mai-Da-Zao for the alleviation of depression in rat models (preclinical, 2022)

Li YX, Cheng KC, Hsu CT, Cheng JT, Yang TT. Plants, 2022, 11(3): 258.

Using the unpredictable chronic mild stress (UCMS) model and chemical serotonin depletion in rats, this study found that 21 days of GMDZ administration significantly improved depressive behaviors. The antidepressant effect was linked to enhanced expression of serotonin transporter (5-HTT) and brain-derived neurotrophic factor (BDNF) in the hippocampus, supporting a neurobiological mechanism for the formula's traditional use.

Research on TCM formulas is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.