Wendan Decoction: A classic formula for regulating qi, resolving phlegm, clearing the gallbladder and harmonizing the stomach.

1. Prescription Source & History

1. Origin Legend

The origin of Wen Dan Decoction has rich legendary stories. It is said that in ancient times, there was a scholar who was always timid and easily frightened on weekdays. When sleeping at night, the slightest noise would startle him, and after waking up, he often felt restless and was difficult to fall asleep again. His family was very worried about this and sought medical treatment everywhere, but the effects were not very satisfactory. Later, an old Chinese doctor heard about the scholar's situation and prescribed a special formula for him. After the scholar took it, his sleep quality gradually improved, and he became braver and was no longer as easily frightened as before. This miraculous formula was the prototype of Wendan Decoction, and it got its name because it could warm the gallbladder qi and treat symptoms such as timidity and easy startle caused by gallbladder cold.

2. Historical Records

Wendan Decoction was first recorded in 'Jiyan Fang' during the Southern and Northern Dynasties, and the original formula has been lost. In the Tang Dynasty, Sun Simiao included Wendan Decoction in 'Beiji Qianjin Yaofang'. Its drug composition was slightly different from that of later generations, consisting of six herbs: Pinellia ternata, Phyllostachys nigra var. henonis, Immature Bitter Orange, Citrus reticulata Blanco, Ginger, and Licorice Root. The book records that it is mainly used to treat restlessness and inability to sleep after a serious illness, which is due to gallbladder cold, and Wendan Decoction is suitable. Since then, Wendan Decoction has continuously developed and evolved in the clinical practice of doctors in successive dynasties. Chen Wuzhe in the Song Dynasty further improved Wendan Decoction in 'San因 Jiyi Bingzheng Fanglun'. Based on the original formula, Poria cocos was added, enhancing the effect of strengthening the spleen and promoting diuresis to eliminate dampness, making the formula more comprehensively targeted at the pathogenesis of disharmony between the gallbladder and stomach and internal disturbance of phlegm-heat. During the Ming and Qing dynasties, doctors had richer experience in the application of formulas, and the application scope of Wendan Decoction was also expanded. It was not only used to treat insomnia but also widely applied to various diseases caused by phlegm-heat.

3. Inheritance & Development

With the changes of history, Wendan Decoction, as a classic formula in traditional Chinese medicine, has been passed down to this day. Doctors in successive dynasties have continuously explored its efficacy and application scope in clinical practice, and made additions, subtractions, and changes to the formula according to different diseases and individual differences. Nowadays, Wendan Decoction is not only widely used in various clinical departments in China but also spread to all over the world, attracting the attention of many traditional Chinese medicine enthusiasts and researchers. As a representative formula for treating phlegm-heat diseases in traditional Chinese medicine, it has relieved the pain of countless patients and occupies an important position in the development process of traditional Chinese medicine formulaology.

Wendan Decoction: A classic formula for regulating qi, resolving phlegm, clearing the gallbladder and harmonizing the stomach.

2. Composition of Medicinal Flavors

1. Monarch Drug - Pinellia

Pinellia ternata is the monarch herb in Wendan Decoction. It has a pungent taste and warm nature, and belongs to the spleen, stomach, and lung meridians. It has the effects of drying dampness and resolving phlegm, descending adverse qi and stopping vomiting, and dissipating masses and resolving stagnation. In Wendan Decoction, Pinellia ternata can dry dampness and resolve phlegm, and treat the phlegm pathogen generated by disharmony between the gallbladder and stomach and internal disturbance of phlegm-heat. Its pungent and warm nature can dissipate phlegm and resolve masses, enabling the phlegm to be eliminated. At the same time, the descending effect of Pinellia ternata helps to harmonize the stomach and descend adverse qi, relieving symptoms such as nausea and vomiting caused by upward reversal of stomach qi. Just as stated in 'Compendium of Materia Medica': Pinellia ternata has a pungent taste and warm nature, is toxic, and can dry dampness and resolve phlegm, descend adverse qi and stop vomiting, dissipate masses and resolve stagnation. The application of Pinellia ternata lays the foundation for Wendan Decoction to treat the syndrome of internal disturbance of phlegm-heat.

2. Minister Drug - Bamboo Shavings

Phyllostachys nigra var. henonis is the ministerial herb, with a sweet and slightly cold taste, and belongs to the lung, stomach, and gallbladder meridians. It has the effects of clearing heat and resolving phlegm, and removing vexation and stopping vomiting. It can clear and resolve phlegm-heat. When combined with Pinellia ternata, one is warm and the other is cold, restricting each other and enhancing the power of resolving phlegm and clearing heat. For symptoms such as restlessness and bitter taste in the mouth caused by stagnation of gallbladder and stomach heat and internal disturbance of phlegm-heat, Phyllostachys nigra var. henonis can play a good role in clearing heat and removing vexation. At the same time, its effect of stopping vomiting can assist Pinellia ternata in harmonizing the stomach and descending adverse qi, further relieving the symptoms of upward reversal of stomach qi.

3. Assistant Drugs - Immature Bitter Orange, Tangerine Peel, Poria

Immature Bitter Orange tastes bitter, pungent, and sour, with a slightly cold nature, and belongs to the spleen and stomach meridians. It has the effects of breaking qi and reducing accumulation, and resolving phlegm and relieving fullness. In Wendan Decoction, Immature Bitter Orange can break qi and promote qi movement, eliminating the appearance of qi stagnation and phlegm obstruction, and working synergistically with Pinellia ternata and Phyllostachys nigra var. henonis to enhance the effect of resolving phlegm and regulating qi. Citrus reticulata Blanco tastes pungent and bitter, with a warm nature, and belongs to the spleen and lung meridians. It can regulate qi and strengthen the spleen, dry dampness and resolve phlegm, helping to regulate the qi movement of the spleen and stomach, enhancing the transportation and transformation function of the spleen and stomach, and preventing the endogenous generation of phlegm-dampness. Poria cocos tastes sweet and light, with a neutral nature, and belongs to the heart, lung, spleen, and kidney meridians. It has the effects of promoting diuresis to eliminate dampness, strengthening the spleen, and calming the mind. Poria cocos can strengthen the spleen and promote diuresis to eliminate dampness, enabling the damp pathogen to be transported and transformed, reducing the generation of phlegm, and at the same time calming the mind and relieving restlessness caused by internal disturbance of phlegm-heat. These three herbs together serve as the assistant herbs, assisting the monarch and ministerial herbs to exert their effects, making the formula more comprehensively targeted at the pathogenesis.

4. Assistant Drug - Licorice Root

Licorice root tastes sweet, is of neutral nature, and pertains to the heart, lung, spleen, and stomach meridians. It has the effects of invigorating the spleen and replenishing qi, moistening the lung and relieving cough, clearing heat and detoxifying, and harmonizing various herbs. In Wendan Decoction, as the envoy herb, licorice root can not only harmonize the cold and heat properties of herbs such as Pinellia ternata and Phyllostachys nigra var. henonis, but also alleviate the drastic properties of various herbs, making the properties of the formula mild and easy to take. At the same time, licorice root can invigorate the spleen and replenish qi, enhance the functions of the spleen and stomach, and promote the absorption and transportation of herbs.

Wendan Decoction: A classic formula for regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach HJMEDICAL">

III. Pathogenesis, Effects and Indications

1. Pathogenesis

Wendan Decoction The pathogenesis it targets is mainly disharmony between the gallbladder and stomach, and internal disturbance of phlegm-heat. The gallbladder is in charge of decision-making and houses the ministerial fire. If the gallbladder qi is restless and the ministerial fire stirs erratically, combined with abnormal transportation and transformation of the spleen and stomach, endogenous phlegm-dampness is generated, and phlegm-heat binds together, resulting in disharmony between the gallbladder and stomach. Phlegm-heat disturbing the heart spirit can cause symptoms such as restlessness and insomnia; upward reversal of stomach qi will cause manifestations such as nausea and vomiting. In addition, discomfort of gallbladder qi may also lead to symptoms such as emotional discomfort, bitter taste in the mouth and dryness. This pathogenesis is relatively common in modern life, and factors such as long-term mental stress, irregular diet, and emotional disorders may all trigger it.

2. Effects

Wendan Decoction has the effects of regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach. By using herbs such as Pinellia ternata, Citrus reticulata, and Immature Citrus aurantium to regulate qi and resolve phlegm, and Phyllostachys nigra var. henonis to clear heat and resolve phlegm, it jointly eliminates the pathogenic factor of phlegm-heat in the body. At the same time, the herbs in the formula can also regulate the qi mechanism of the gallbladder and stomach, make the gallbladder qi smooth, and the stomach qi descend. Thus, it achieves the purpose of relieving various symptoms caused by disharmony between the gallbladder and stomach and internal disturbance of phlegm-heat.

3. Indications

Wendan Decoction is mainly used to treat the syndrome of disharmony between the gallbladder and stomach and internal disturbance of phlegm-heat. Common symptoms include vexation and insomnia, palpitations and uneasiness, bitter taste in the mouth and nausea, or vomiting and retching, dizziness, fullness and oppression, greasy and slightly yellowish tongue coating, and taut and slippery pulse. Clinically, it can be used to treat various diseases, such as insomnia, anxiety disorder, depression, vertigo, gastritis, gastric ulcer, Meniere's disease, etc. It has good curative effects on mental and nervous system symptoms and digestive system symptoms caused by internal disturbance of phlegm-heat. For example, some insomnia patients, who show difficulty in falling asleep, having many dreams and being easy to wake up, restlessness and bitter taste in the mouth, often have obvious improvement in sleep quality after taking Wendan Decoction.

Wendan Decoction: A classic formula for regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach HJMEDICAL">

IV. Analysis of Wen Dan Tang Formula Principles

1. Resolving Phlegm and Regulating Qi

Pinellia ternata dries dampness and resolves phlegm, Immature Citrus aurantium breaks qi and resolves phlegm, Citrus reticulata regulates qi and resolves phlegm. The three cooperate with each other to treat phlegm pathogen and qi stagnation. Phlegm is a yin pathogen, with a sticky nature and easy to obstruct qi movement; qi stagnation will lead to unsmooth flow of body fluids, aggravating the generation of phlegm pathogen. By resolving phlegm and regulating qi, phlegm can be eliminated and qi can flow smoothly, restoring the normal functions of the gallbladder and stomach. Phyllostachys nigra var. henonis clears heat and resolves phlegm, and synergistically acts with herbs such as Pinellia ternata to enhance the power of clearing heat and resolving phlegm, so as to clear away the pathogenic factor of phlegm-heat.

2. Clearing Gallbladder and Harmonizing Stomach

The gallbladder is in charge of making decisions and houses the ministerial fire internally. When the qi of the gallbladder is restless, the ministerial fire will stir recklessly. Bamboo shavings clear the heat of the gallbladder, and immature bitter orange breaks qi and promotes qi movement, which helps the qi of the gallbladder to be smooth and the ministerial fire to be calmed. At the same time, pinellia ternata and pericarpium citri reticulatae regulate the stomach and descend adverse qi, and licorice root harmonizes the spleen and stomach, enabling the stomach qi to descend and harmonize, thus achieving the purpose of clearing the gallbladder and regulating the stomach. When the functions of the gallbladder and stomach are coordinated, the qi mechanism of the human body can be smooth and various symptoms can be alleviated.

3. Calm the Mind and Settle the Spirit

Phlegm-heat disturbing the mind can lead to symptoms such as restlessness and insomnia. Poria cocos invigorates the spleen and tranquilizes the mind, helping to relieve restlessness of the mind. At the same time, the whole formula improves the internal environment of the human body by resolving phlegm, clearing heat, regulating qi and harmonizing the stomach, thus indirectly playing the role of tranquilizing the mind and calming the nerves. It also has a certain regulatory effect on mental symptoms caused by phlegm-heat, such as anxiety and restlessness.

Wendan Decoction: A classic formula for regulating qi and resolving phlegm, clearing the gallbladder and regulating the stomach.

V. Comparison with Other Similar Formulas

1. Comparison with Minor Bupleurum Decoction

Minor Bupleurum Decoction Harmonizes the shaoyang meridian and is mainly used to treat the syndrome of exogenous cold attacking the shaoyang meridian, manifested as alternating chills and fever, fullness and discomfort in the chest and hypochondrium, listlessness and loss of appetite, restlessness and preference for sighing, etc. Its pathogenesis is that the pathogen is in the shaoyang meridian and the pivot mechanism is malfunctioning. Wendan Decoction mainly targets the syndrome of disharmony between the gallbladder and stomach and phlegm-heat disturbing the interior, with the main effects of resolving phlegm and regulating qi, clearing the gallbladder and regulating the stomach. There are differences in their pathogenesis and treatment. Minor Bupleurum Decoction focuses on harmonizing the shaoyang meridian and regulating the pivot mechanism; Wendan Decoction focuses on resolving phlegm and clearing heat and regulating the gallbladder and stomach. In terms of drug composition, Minor Bupleurum Decoction uses bupleurum chinense and scutellaria baicalensis as the main drugs to harmonize the shaoyang meridian; Wendan Decoction uses pinellia ternata and bamboo shavings as the main drugs to resolve phlegm and clear heat.

2. Comparison with Coptis Gallbladder-Warming Decoction

Coptis Wendan Decoction is formed by adding coptis chinensis to Wendan Decoction. Coptis chinensis is bitter in taste and cold in nature, with the functions of clearing heat and drying dampness, purging fire and detoxifying. Coptis Wendan Decoction enhances the power of clearing heat and purging fire and is more suitable for diseases with relatively severe phlegm-heat and accompanied by signs of fire-heat, such as obvious restlessness and bitter taste in the mouth, red tongue with yellow and greasy coating. While Wendan Decoction relatively focuses on resolving phlegm and regulating qi and has a weaker power of clearing heat. There are certain differences in their drug composition and efficacy, and clinical application requires selection according to the specific symptoms of the patients.

3. Comparison with Clear Qi Phlegm-Removing Pill

Qingqi Huatan Pills clears heat and resolves phlegm, and is mainly used to treat phlegm-heat accumulation, manifested as wheezing, thick and yellow phlegm, stuffiness and discomfort in the chest and diaphragm, etc. Its pathogenesis is mainly phlegm-heat congesting the interior. Although Wendan Decoction also has the effect of resolving phlegm and clearing heat, it focuses more on the pathogenesis of disharmony between the gallbladder and stomach and phlegm-heat disturbing the interior. In terms of drug composition, Qingqi Huatan Pills mainly use arisaema cum bile, semen benincasae, scutellaria baicalensis and other drugs for clearing heat and resolving phlegm; Wendan Decoction mainly uses pinellia ternata, bamboo shavings, immature bitter orange and other drugs for regulating the qi mechanism of the gallbladder and stomach. There are differences in their clinical applications. Qingqi Huatan Pills are mostly used to treat phlegm-heat diseases in the chest and diaphragm, while Wendan Decoction is more widely used in phlegm-heat diseases related to the gallbladder and stomach.

Wendan Decoction: A classic formula for regulating qi and resolving phlegm, clearing the gallbladder and regulating the stomach.

VI. Clinical Applications and Indications

1. Insomnia

Insomnia is Wendan Decoction one of the relatively common indications. For insomnia caused by internal disturbance of phlegm-heat, patients often have difficulty falling asleep and have many dreams, accompanied by symptoms such as restlessness, bitter taste in the mouth, and yellow and greasy tongue coating. Wendan Decoction can improve sleep quality through the effects of resolving phlegm and clearing heat, and calming the mind. Clinical studies have shown that the modified Wendan Decoction in the treatment of insomnia has good efficacy, which can prolong the sleep time of patients, increase the sleep depth, and significantly improve the sleep quality.

2. Anxiety Disorder

Patients with anxiety disorder often show symptoms such as emotional anxiety, restlessness, insomnia, bitter taste in the mouth, and chest tightness, which conform to the pathogenesis of disharmony between the gallbladder and stomach and internal disturbance of phlegm-heat. Wendan Decoction can regulate qi and resolve phlegm, clear the gallbladder and harmonize the stomach, and regulate the patient's mood and physical state. Some clinical observations have found that the combination of Wendan Decoction and psychotherapy has good therapeutic effects on patients with anxiety disorder, which can relieve the anxiety symptoms of patients and improve the quality of life.

3. Vertigo

The occurrence of vertigo is closely related to the upward disturbance of phlegm turbidity and the obstruction of clear yang. Wendan Decoction resolves phlegm and regulates qi, which helps to eliminate phlegm pathogens, enables the clear yang to rise, and the vertigo symptoms are relieved. For vertigo caused by Meniere's disease, etc., the modified Wendan Decoction in the treatment can improve the patient's dizziness, tinnitus, nausea and vomiting and other symptoms, improve the inner ear circulation, reduce the inner ear hydrops, so as to achieve the purpose of treating vertigo.

4. Digestive Diseases

In terms of digestive system diseases, Wendan Decoction can be used to treat gastritis, gastric ulcer, dyspepsia, etc. Disharmony between the gallbladder and stomach and internal disturbance of phlegm-heat can lead to symptoms such as discomfort in the stomach and epigastrium, nausea, vomiting, and bitter taste in the mouth. Wendan Decoction can relieve these symptoms and promote the recovery of digestive function by regulating the qi movement of the gallbladder and stomach, resolving phlegm and clearing heat. Clinical practice has proved that Wendan Decoction has a certain effect on improving the symptoms of patients with digestive system diseases, promoting gastrointestinal motility, and regulating digestive juice secretion.

Wendan Decoction: A classic formula for regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach HJMEDICAL">

VII. Modified Wendan Decoction

1. Severe Phlegm-Heat

If the phlegm-heat is relatively severe, Coptis chinensis and Scutellaria baicalensis can be added to enhance the power of clearing heat and purging fire. Coptis chinensis and Scutellaria baicalensis are bitter and cold, which can directly reduce the fire force and clear away the phlegm-heat pathogens. If the patient has obvious restlessness and bitter taste in the mouth, and the yellow and greasy tongue coating is relatively thick, after adding Coptis chinensis and Scutellaria baicalensis, the phlegm-heat symptoms can be effectively reduced, and the heat-clearing effect of the formula can be enhanced.

2. Obvious Qi Stagnation

When qi stagnation is obvious, qi-regulating herbs such as Cyperus rotundus and Curcuma aromatica can be added. Cyperus rotundus soothes the liver and regulates qi, alleviating menstruation-related pain; Curcuma aromatica promotes blood circulation to relieve pain and regulates qi to disperse depression. The two can enhance the qi-regulating effect and make the qi mechanism smoother. For patients with prominent qi stagnation symptoms such as chest and hypochondrium distension and emotional depression, adding Cyperus rotundus and Curcuma aromatica can better relieve the symptoms.

3. Severe Insomnia

When insomnia is severe, sedative herbs such as Semen Ziziphi Spinosae and Radix Polygalae can be added. Semen Ziziphi Spinosae nourishes the heart and liver, soothes the nerves and restrains sweating; Radix Polygalae soothes the nerves and improves intelligence, resolves phlegm and opens the orifices. They can enhance the effect of calming the heart and soothing the nerves, help patients fall asleep better and improve sleep quality.

4. Weak Spleen and Stomach

For those with weak spleen and stomach, spleen-strengthening herbs such as Codonopsis pilosula and Atractylodes macrocephala can be added. Codonopsis pilosula strengthens the spleen and benefits qi, nourishes blood and promotes fluid production; Atractylodes macrocephala strengthens the spleen and supplements qi, dries dampness and promotes diuresis. Enhancing the function of the spleen and stomach helps to transform and transport water dampness, prevent the endogenous generation of phlegm-dampness, and at the same time can also promote the absorption and utilization of drugs, enabling the prescription to play a better role.

Wendan Decoction: A classic prescription for regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach.

VIII. Dosage (Traditional and Modern Concentrated Granules)

1. Traditional Methods

When decocting Wendan Decoction by traditional methods, generally weigh the herbs such as Pinellia ternata, Phyllostachys nigra, Fructus Immaturus Citri Reticulatae, Pericarpium Citri Reticulatae, Zingiber officinale, Glycyrrhiza glabra, and Poria cocos according to a certain dosage. Usually, 6 grams of Pinellia ternata, 6 grams of Phyllostachys nigra, 6 grams of Fructus Immaturus Citri Reticulatae, 9 grams of Pericarpium Citri Reticulatae, 5 slices of Zingiber officinale, 3 grams of Glycyrrhiza glabra, and 5 grams of Poria cocos. Soak the herbs for about 30 minutes, then add water and decoct. Generally, after boiling with strong fire, then decoct with slow fire for 20 - 30 minutes, take the decoction, one dose per day, divided into two times.

2. Modern Concentrated Granules

Modern concentrated granules are granule preparations made by extracting and concentrating traditional Chinese herbs, which are convenient to take. When using, just take them according to the dosage on the instruction manual. For example, the concentrated granule preparation of Wendan Decoction generally contains an extract equivalent to a certain amount of the original herbs in each bag. Patients only need to take the granules with boiling water, one dose per day, divided into two times. Compared with traditional decoctions, modern concentrated granules retain the effective components of traditional Chinese herbs, are convenient to carry and take, save the decocting time, and are more suitable for the fast-paced modern life.

Wendan Decoction: A classic prescription for regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach.

IX. Precautions and Taboos

Although Wendan Decoction is a widely used and effective prescription, there are also some precautions and taboos when using it.

1. Dietary Taboos

During the period of taking Wendan Decoction, spicy, greasy and stimulating foods should be avoided. These foods are likely to generate phlegm and assist the fire, aggravating the symptoms of internal disturbance by phlegm-heat and being unfavorable to the recovery of the illness. For example, chili, fried foods, strong tea, etc. should be avoided as much as possible.

2. Physical Constitution Differences

Those with a deficiency-cold constitution should use Wendan Decoction with caution. The medicinal properties of Wendan Decoction are relatively cold and cool. For patients with a deficiency-cold constitution and yang deficiency of the spleen and stomach, taking it may aggravate the deficiency-cold symptoms, such as abdominal pain, diarrhea, fear of cold and cold limbs, etc. If such patients need to use it, they should, under the guidance of a doctor, make appropriate additions, subtractions or adjustments to the medication according to the specific situation.

3. Pregnant Women Use with Caution

Pregnant women need to use medications cautiously. The drug components in Wendan Decoction may have an impact on the fetus. Although there is no clear research indicating an absolute contraindication of Wendan Decoction for pregnant women, for the safety of the fetus, if pregnant women need to use Wendan Decoction, it must be carried out under the strict evaluation and guidance of a doctor.

4. Drug Interactions

If taking other medications, inform the doctor, because the drug components in Wendan Decoction may interact with other medications. For example, when used simultaneously with certain antibiotics, sedative-hypnotics, etc., it may affect the efficacy of the drugs or increase the risk of adverse reactions.

Wendan Decoction: A classic formula for regulating qi and resolving phlegm, clearing the gallbladder and harmonizing the stomach

X. Modern Research Progress

1. Pharmacological Research

Modern pharmacological studies have shown that Wendan Decoction has various pharmacological effects. Its drug components such as Pinelliae Rhizoma, Phyllostachys nigra (Lodd.) Munro var. henonis (Mitf.) Stapf ex Rendle, Immaturus Aurantii Fructus, etc. have anti-inflammatory, antibacterial and antiviral effects, can regulate the immune function of the body and enhance the body's resistance to pathogens. At the same time, Wendan Decoction can also regulate gastrointestinal function, promote gastrointestinal motility, increase the secretion of digestive juices and improve digestive function. In addition, Wendan Decoction also has a certain regulatory effect on the nervous system, can relieve emotions such as anxiety and depression and improve sleep quality.

2. Clinical Research

In terms of clinical research, more and more evidence supports the effectiveness of Wendan Decoction in the treatment of various diseases. In addition to insomnia, anxiety disorder, vertigo, digestive system diseases mentioned above, Wendan Decoction also shows good prospects in the treatment of some other diseases. For example, in cardiovascular diseases, Wendan Decoction can regulate blood lipids and improve hemorheological indexes, and has a certain adjuvant effect on the prevention and treatment of cardiovascular diseases. In respiratory diseases, Wendan Decoction can relieve cough, expectorate phlegm and other symptoms, and has a certain therapeutic effect on diseases such as chronic bronchitis.

3. Dosage Form Improvement

With the development of modern technology, the dosage forms of Wendan Decoction are constantly improving. In addition to the traditional decoction and modern concentrated granules, dosage forms such as capsules and tablets of Wendan Decoction have also emerged. The emergence of these new dosage forms further improves the convenience and stability of taking Wendan Decoction and provides more choices for patients. At the same time, scientific researchers are also exploring how to optimize the preparation process of Wendan Decoction to improve the quality and efficacy of the drugs.

4. Mechanism of Action Research

Regarding the mechanism of action of Wendan Decoction, it is still under in-depth research. Studies have found that Wendan Decoction may achieve the purpose of treating diseases by regulating the functions of multiple systems such as the neuroendocrine system, immune system, and gastrointestinal system. For example, it may improve sleep and mood states by regulating the levels of neurotransmitters in the brain; by regulating the balance of gut microbiota and enhancing the intestinal barrier function, it can improve digestive function and overall health. In the future, with the continuous in-depth research, the mechanism of action of Wendan Decoction will become more clear, providing a more solid theoretical basis for its clinical application.

Conclusion

Wen Dan Decoction is a classic prescription in traditional Chinese medicine, with the effects of clearing heat and resolving phlegm, clearing and resolving phlegm-heat. It is mainly used to treat the phlegm-fluid syndrome caused by phlegm-heat disturbing the heart and gallbladder cold. Patients often present symptoms such as palpitations, insomnia, restlessness and inability to sleep, bitter taste in the mouth, constipation, etc. The tongue coating is yellow and greasy, and the pulse is slippery. The medicinal herbs in this prescription include Pinellia ternata, Citrus reticulata, Aurantii fructus immaturus, Zingiber officinale, Glycyrrhiza glabra, etc. Clinically, it is often used in combination with or modified from Suanzaoren Decoction; for those with the combination of phlegm and blood stasis, drugs for promoting blood circulation and removing blood stasis can be added. Similar to the treatment methods related to phlegm-fluid in Synopsis of the Golden Chamber, Wendan Decoction embodies the characteristics of resolving phlegm and calming the mind, and regulating the gallbladder and stomach.