Long Dan Xie Gan Tang: Clearing Liver Fire and Draining Damp-Heat

SERVICE HONGJI MEDICAL

The Source and History of Long Dan Xie Gan Tang

1. Long Dan Xie Gan Tang Origin

Long dan Xie gan Decoction originated from 'Collection and Explanation of Medical Formulas' written by Wang Ang, a famous medical expert in the Qing Dynasty. Wang Ang, with the courtesy name Ji'an, was a medical scientist who made outstanding contributions to traditional Chinese medicine formulaology. He was aware that there were numerous medical formulas at that time, making it difficult for beginners to master. Therefore, he extensively collected and carefully selected, and compiled the book 'Collection and Explanation of Medical Formulas'. This book elaborated in detail the origin, composition, formula explanation, functions, and main treatments of each formula, becoming a classic in traditional Chinese medicine formulaology. Longdan Xiegan Decoction is one of the most representative formulas among them.

2. Historical Evolution

The origin of Longdan Xiegan Decoction can be traced back to the Jin and Yuan dynasties. There was a formula called Longdan Yinzi in Li Dongyuan's 'Secret Collection of the Orchid Chamber' at that time, and its drug composition included gentian, ledebouriella root, raw rehmannia root, angelica sinensis, bupleurum, etc. In the Ming Dynasty, a similar formula was also recorded in 'Complete Works of Jingyue', but the drug composition and efficacy were slightly different. On the basis of synthesizing the experiences of predecessors, Wang Ang further optimized and perfected Longdan Xiegan Decoction, forming the formula we are familiar with now. Since then, Longdan Xiegan Decoction has continuously developed in clinical applications and has been widely used to treat various diseases, and its influence has continued to this day.

Introduction to the Ingredients of Long Dan Xie Gan Tang (Ruler, Minister, Assistant, and Guide)

1. Ruler Herb — Gentiana scabra

Gentian has a bitter and cold nature and belongs to the liver and gallbladder meridians. It is extremely bitter and cold, with extremely strong power in clearing heat and drying dampness. It can clear the excess fire of the liver and gallbladder and is the key medicine for treating the upward inflammation of the excess fire in the liver meridian. In Longdan Xiegan Decoction, gentian directly enters the liver meridian, purging fire and removing dampness, and is the main medicine in the formula.

2. Minister Herbs — Scutellaria baicalensis, Gardenia jasminoides

Scutellaria has a bitter and cold nature and belongs to the lung, gallbladder, spleen, large intestine, and small intestine meridians. It can clear heat and dry dampness, purge fire and detoxify, and is especially good at clearing the fire in the upper jiao. In Longdan Xiegan Decoction, scutellaria assists gentian in clearing the fire of the liver and gallbladder, and at the same time can also take into account other zang-fu organs to prevent the spread of fire. Gardenia is also bitter and cold, belonging to the heart, lung, and triple energizer meridians, and can purge fire and remove vexation, clear heat and promote dampness, cool the blood and detoxify. Gardenia combined with scutellaria enhances the effects of clearing heat and purging fire, promoting dampness and detoxifying, further assisting gentian in clearing the excess fire of the liver and gallbladder, and they are both assistant medicines.

3. Assistant Herbs — Alisma orientale, Akebia quinata, Plantago asiatica

Alisma has a sweet, bland, and cold nature and belongs to the kidney and bladder meridians. Its effect of promoting diuresis and percolating dampness is relatively strong, and it can clear and promote dampness-heat in the lower jiao, allowing the dampness-heat to be excreted through urine. Akebia quinata has a bitter and cold nature and belongs to the heart, small intestine, and bladder meridians, and can clear heat and purge fire, promote diuresis and relieve stranguria. Plantago asiatica has a sweet and cold nature and belongs to the liver, kidney, lung, and small intestine meridians, and can clear heat, promote diuresis and relieve stranguria, percolate dampness and stop diarrhea, clear the liver and improve eyesight. The combination of these three medicines enhances the effect of clearing heat and promoting dampness, enabling the dampness-heat in the lower jiao to be quickly discharged, and they are the assistant medicines in the formula, assisting the monarch and assistant medicines in clearing heat and promoting dampness.

4. Assistant Herbs — Angelica sinensis, Rehmannia glutinosa

Angelica sinensis has a sweet, spicy, and warm nature and belongs to the liver, heart, and spleen meridians. In Longdan Xiegan Decoction, angelica nourishes and activates blood circulation to prevent the extremely bitter and cold substances such as gentian, scutellaria, and gardenia from damaging yin and blood. Raw rehmannia root has a sweet, bitter, and cold nature and belongs to the heart, liver, and kidney meridians, and can clear heat and cool the blood, nourish yin and promote the production of body fluid. The combination of raw rehmannia root and angelica sinensis can both nourish yin and activate blood circulation, and prevent the heat-clearing and dampness-drying medicines from overly damaging yin, playing the role of nourishing yin and activating blood circulation, strengthening the healthy qi and eliminating pathogenic factors, and also serving as assistant medicines.

5. Guide Herb — Bupleurum chinense

Bupleurum has a bitter, pungent, and slightly cold nature and belongs to the liver and gallbladder meridians. It has the effects of reconciling shaoyang and reducing fever, soothing the liver and relieving depression, and lifting yang qi. In Longdan Xiegan Decoction, bupleurum can soothe the liver and regulate qi, guide all the medicines into the liver meridian, enabling the medicinal power to directly reach the affected area, and at the same time can prevent the bitter and cold medicines such as gentian from sinking too much, playing the role of guiding the meridian and serving as the messenger medicine.

Pathogenesis, Effects, and Indications of Longdan Xiegan Decoction

1. Pathogenesis

The pathogenesis targeted by Gentiana Liver-Clearing and Gallbladder-Draining Decoction is mainly the flaming up of excessive fire in the liver and gallbladder and the downward pouring of damp-heat in the liver meridian. Emotional stagnation leading to transformation of liver qi into fire, or exogenous damp-heat pathogen invading and accumulating in the liver and gallbladder can both cause the flaming up of excessive fire in the liver and gallbladder. The pathogenic fire disturbing along the meridian can present symptoms such as headache, red eyes, bitter taste in the mouth, deafness, and rib-side pain. If damp-heat pours downward along the meridian, it can trigger such disorders as swelling of the genitals, itching of the genitals, flaccidity of the sinews, sweating in the genital area, and turbid urination.

2. Effects

Based on the above pathogenesis, Gentiana Liver-Clearing and Gallbladder-Draining Decoction has the effects of clearing excessive fire from the liver and gallbladder and removing damp-heat from the liver meridian. Through the synergistic effect of the monarch, ministerial, assistant, and envoy herbs in the formula, the excessive fire in the liver meridian is cleared, and the pathogenic damp-heat is removed, thus achieving the purpose of treating diseases.

3. Indications

Gentiana Liver-Clearing and Gallbladder-Draining Decoction is主治证 for the syndrome of flaming up of excessive fire in the liver and gallbladder and the syndrome of downward pouring of damp-heat in the liver meridian. Symptoms include headache and red eyes, rib-side pain and bitter taste in the mouth, deafness, ear swelling, red tongue with yellow coating, and forceful string-taut pulse; or swelling of the genitals, itching of the genitals, flaccidity of the sinews, sweating in the genital area, turbid urination, or foul-smelling yellow vaginal discharge in women. It has a wide clinical application and has good curative effects on various diseases caused by excessive fire or damp-heat in the liver and gallbladder.

Gentiana Liver-Clearing and Gallbladder-Draining Decoction Analysis of Formula Principles

1. Clearing Excessive Fire in Liver and Gallbladder

In the formula, gentiana is extremely bitter and very cold, directly purging excessive fire in the liver and gallbladder, and is the monarch herb. Scutellaria and gardenia are bitter and cold, purging fire to assist gentiana in clearing fire from the liver and gallbladder, and are both ministerial herbs. The combination of these three herbs can quickly clear the excessive fire in the liver meridian and relieve the symptoms.

2. Clearing and Promoting Dampness-Heat in Liver Meridian

Alisma, akebia, and plantago clear heat and promote diuresis, enabling the damp-heat in the lower jiao to be excreted through urine. These three herbs combined with heat-clearing herbs such as gentiana enhance the effect of clearing heat and promoting diuresis, playing a major therapeutic role in the syndrome of downward pouring of damp-heat in the liver meridian.

3. Nourishing Blood and Yin

Angelica sinensis and Rehmannia glutinosa nourish blood and yin, preventing the drugs for clearing heat and drying dampness from damaging yin. While clearing excessive fire and damp-heat, it pays attention to protecting yin and blood, reflecting the principle of treating diseases by dispelling pathogenic factors without harming healthy qi in traditional Chinese medicine.

4. Soothing Liver Qi

Bupleurum can soothe the liver and regulate qi, guiding all the drugs into the liver meridian, enabling the medicinal power to reach the affected area directly. At the same time, the ascending and dispersing property of Bupleurum can prevent other drugs in the formula from sinking too much, playing the role of regulating qi movement and guiding the medicinal power.

Comparison with Other Similar Formulas

1. Comparison with Xieqing Pills

Xieqing Pills come from 'Key to Therapeutics of Children's Diseases'. Its main efficacy is to clear the liver and purge fire. Compared with Longdan Xiegan Decoction, Xieqing Pills have a stronger effect of purging fire, and it adds wind-dispelling drugs such as Notopterygium incisum and Saposhnikovia divaricata, focusing more on dispersing wind-heat in the liver meridian. While Longdan Xiegan Decoction, on the basis of clearing excessive fire from the liver and gallbladder, pays more attention to clearing damp-heat from the liver meridian and has drugs for nourishing blood and yin to prevent yin damage.

2. Comparison with Zuojin Pills

Zuojin Pills come from 'Danxi's Methods of Treatment', composed of Coptis chinensis and Evodia rutaecarpa. Its efficacy is to clear the liver and purge fire, and lower adverse qi and stop vomiting. It is mainly used for treating the syndrome of liver fire invading the stomach, with symptoms such as hypochondriac pain, acid regurgitation, vomiting and bitter taste in the mouth. Compared with Longdan Xiegan Decoction, Zuojin Pills have a simple composition of drugs, mainly targeting the specific pathogenesis of liver fire invading the stomach, mainly clearing liver fire and lowering adverse qi and stopping vomiting. While Longdan Xiegan Decoction has a wider range of treatment, covering various diseases such as excessive fire of the liver and gallbladder flaring up and downward flow of damp-heat in the liver meridian.

Clinical Applications and Indications

1. Ophthalmic Diseases

For symptoms such as red and swollen eyes, photophobia and excessive tearing caused by excessive fire of the liver meridian flaring up, Longdan Xiegan Decoction has a good therapeutic effect. For example, in acute conjunctivitis, keratitis, etc., when辨证 belongs to excessive fire of the liver and gallbladder, it can be appropriately modified and applied in the formula. Clinically, it is often seen that patients have red, swollen, hot and painful eyes, accompanied by symptoms such as bitter taste in the mouth, dry throat, red tongue with yellow coating. After taking Longdan Xiegan Decoction, the eye symptoms can gradually relieve.

2. Ear Diseases

If there are symptoms such as red, swollen and painful ears, tinnitus, deafness, etc. due to accumulation of damp-heat in the liver and gallbladder in the ears, Longdan Xiegan Decoction can also be used as a treatment formula. For example, in acute otitis media, external otitis, etc., when辨证 is damp-heat of the liver and gallbladder, applying Longdan Xiegan Decoction to clear damp-heat can relieve the ear symptoms and promote the recovery of the disease.

3. Urinary System Diseases

For symptoms such as frequent urination, urgency of urination, dysuria, short and red urine caused by damp-heat pouring downward along the liver meridian, as well as diseases like scrotal eczema and genital itching, Longdan Xiegan Decoction has a certain therapeutic effect. For example, in urinary system infectious diseases such as acute cystitis and urethritis, if differentiated as damp-heat in the liver meridian, using Longdan Xiegan Decoction can clear heat and promote diuresis to relieve symptoms.

4. Dermatological Diseases

In the field of dermatology, Longdan Xiegan Decoction can be used to treat various skin diseases caused by damp-heat. For example, herpes zoster is mostly caused by the accumulation of damp-heat in the liver meridian and exogenous toxic pathogens. Longdan Xiegan Decoction can clear and remove damp-heat, detoxify and relieve pain, which helps to relieve the symptoms of herpes and reduce pain. In addition, for seborrheic dermatitis, acne, etc. differentiated as damp-heat accumulation in the interior, Longdan Xiegan Decoction can also be selected for modification and treatment.

Addition and Subtraction Variations

If the excessive fire of the liver and gallbladder is relatively severe, the dosages of gentian, scutellaria baicalensis, and gardenia fruit can be increased to enhance the power of clearing excessive fire. If the damp-heat in the liver meridian is relatively heavy, the dosages of alisma orientale, akebia quinata, and plantago asiatica can be increased to strengthen the effect of promoting diuresis and clearing heat.

If constipation is also present, rhubarb can be added to induce defecation and let the damp-heat pathogen discharge through the stool.

If obvious swelling and itching of the genitals are present, sophora flavescens, dictamnus dasycarpus, etc. can be added, which can clear heat and dry dampness, kill parasites and relieve itching.

If the pain in the hypochondrium is relatively severe, rhizoma corydalis, fructus toosendan, etc. can be added, which are drugs for regulating qi and relieving pain. If obvious bitter taste and dry mouth are accompanied, trichosanthes kirilowii, anemarrhena asphodeloides, etc. can be added, which can clear heat and promote the production of body fluid.

Dosage and Administration

1. Traditional Method

The traditional usage of Longdan Xiegan Decoction is to be decocted in water for oral administration. The general drug composition and dosage are Gentianae Radix (fried with wine) 6g, Scutellariae Radix (fried) 9g, Gardeniae Fructus (fried with wine) 9g, Alismatis Rhizoma 12g, Akebiae Caulis 9g, Plantaginis Semen 9g, Angelicae Sinensis Radix 3g, Rehmanniae Radix (fried with wine) 9g, Bupleuri Radix 6g, Glycyrrhizae Radix 6g. Add appropriate amount of water to the above drugs, soak and then decoct, and take the decoction warm in two divided doses.

2. Modern Concentrated Granules

With the development of modern pharmaceutical technology, there is also a corresponding concentrated granule dosage form of Longdan Xiegan Decoction. Modern concentrated granules are granule preparations made from traditional Chinese medicines through processes such as extraction and concentration, which are convenient to take. The dosage is generally adjusted according to the product instructions of different manufacturers. Compared with the traditional decoction, the concentrated granules maintain the efficacy of the original formula and are convenient for storage and carrying.

Precautions and Contraindications

1. Use with Caution in Those with Deficient Cold in Spleen and Stomach

Longdan Xiegan Decoction The properties of the medicine are bitter and cold, which are likely to damage the yang qi of the spleen and stomach. Those with spleen and stomach deficiency-cold may experience symptoms such as gastric discomfort, abdominal pain, and diarrhea after taking it, so it should be used with caution. If it must be used, some herbs for strengthening the spleen and regulating the stomach, such as Atractylodis Macrocephalae Rhizoma, Poria, and Citri Reticulatae Pericarpium, can be appropriately added to the formula to reduce the damage of the medicine to the spleen and stomach.

2. Use with Caution in Those with Yin Deficiency and Fluid Injury

Most of the drugs in the formula are bitter and cold, which are likely to consume yin fluid. Those with yin deficiency and fluid injury may have aggravated yin fluid impairment after taking it, presenting symptoms such as dry mouth and throat, red tongue with little coating, and dry stools. If such patients need to use it, Longdan Xiegan Decoction should be selected as appropriate based on nourishing yin and promoting fluid production.

3. Use with Caution in Pregnant Women

Some drugs in the formula, such as Akebiae Caulis, have a certain downward-draining effect. After pregnant women take it, it may have an adverse impact on the fetus. Therefore, pregnant women should use Longdan Xiegan Decoction with caution. If it is necessary to use it, it should be under the guidance of a doctor.

4. Not Suitable for Long-Term Use

Longdan Xiegan Decoction has a relatively strong bitter and cold property. Taking it for a long time may damage the healthy qi, leading to problems such as spleen and stomach weakness and qi and blood deficiency. Therefore, the medicine should be stopped in time after the condition is relieved and should not be taken continuously for a long time.

Modern Research Progress

1. Research on Pharmacological Effects

Modern research shows that Gentiana Liver-Clearing and Gallbladder-Draining Decoction has various pharmacological effects. It has a certain protective effect on the liver, can reduce liver inflammation, and lower indicators such as alanine aminotransferase. At the same time, this formula also has antibacterial, anti-inflammatory, antiviral and other effects, can inhibit the growth and reproduction of a variety of bacteria and viruses, and reduce the inflammatory response. In addition, Gentiana Liver-Clearing and Gallbladder-Draining Decoction also has a certain role in regulating immune function and improving blood circulation.

2. Research on Expansion of Clinical Applications

With the continuous deepening of clinical research, the application scope of Gentiana Liver-Clearing and Gallbladder-Draining Decoction is also constantly expanding. In addition to the traditional treatment of diseases, in recent years, it has also been found to have a certain curative effect in the treatment of certain neurological diseases, cardiovascular diseases, etc. For example, for emotional diseases such as anxiety disorder and depression, if the syndrome differentiation belongs to damp-heat in the liver and gallbladder or liver depression transforming into fire, using Gentiana Liver-Clearing and Gallbladder-Draining Decoction with modification for treatment can achieve certain clinical effects. In terms of cardiovascular diseases, for patients with hypertension, if accompanied by symptoms such as dizziness, bitter taste in the mouth, irritability, etc., and the syndrome differentiation is excessive fire in the liver meridian, applying Gentiana Liver-Clearing and Gallbladder-Draining Decoction can also play an auxiliary role in reducing blood pressure and improving symptoms.

3. Research on Dosage Form Improvement

In order to improve the curative effect and convenience of taking Gentiana Liver-Clearing and Gallbladder-Draining Decoction, modern scientific researchers have done a lot of research on dosage form improvement. In addition to the concentrated granule dosage form mentioned above, there are also attempts to make it into pill dosage form, capsule dosage form and other different dosage forms. These new dosage forms have better stability and compliance on the basis of maintaining the original formula efficacy, providing more choices for clinical application.

Conclusion:

Long Dan Xie Gan Tang is a classic formula in Chinese herbal medicine that clears damp-heat and excess fire from the liver. It is specifically indicated for patterns of damp-heat in the liver channel and gallbladder channel, as well as damp-heat in the liver and liver and gallbladder disharmony. These patterns often present with irritability, bitter taste in the mouth, red and painful eyes, headaches, painful urination, lower abdominal pain, urinary tract symptoms such as urinary tract infections, acute eczema, and sudden hearing loss. In modern applications, it is sometimes used for hyperthyroidism related to liver fire.

The formula promotes urination and drains pathogenic heat through its key ingredients, including long dan cao, huang qin, zhi zi, chai hu, ze xie, che qian zi, mu tong, sheng di huang, and dang gui. Patients typically show a red tongue with yellow coating.

⚠️ This content is for reference only and does not provide medical advice. Consult a healthcare professional for any health concerns.

Our Topics