I. Prescription Source & History

1. Recorded in Ancient Books

Baihe Gujin Decoction originated from "Annotations to Formulas of Famous Physicians Revised and Supplemented in Golden Mirror of Medicine", written by the famous medical scientist Wu Jutong in the Qing Dynasty. Wu Jutong made outstanding contributions to the theory of epidemic febrile diseases, and his works had a profound impact on the clinical practice and theoretical development of traditional Chinese medicine in later generations. Baihe Gujin Decoction was detailedly recorded in this book and became a bright pearl in the treasure house of traditional Chinese medicine prescriptions.

2. Heritage Context

This prescription did not appear out of thin air, but was developed on the basis of the treatment experience of lung and kidney yin deficiency by physicians in past dynasties. Some similar medication ideas and the prototype of prescriptions can be traced back in ancient medical books. For example, Zhu Danxi in the Jin and Yuan dynasties emphasized that "yang is often excessive and yin is often insufficient", and paid attention to nourishing yin and reducing fire. His academic thoughts laid a theoretical foundation for the formation of Baihe Gujin Decoction. As time went by, physicians in later generations continuously enriched and improved the relevant medication combinations. Finally, Wu Jutong summarized and sorted them into the classic prescription of Baihe Gujin Decoction, which has been passed down to this day and is widely used in clinical treatment of diseases related to lung and kidney yin deficiency.

II. Composition of Medicinal Flavors

1. Sovereign Herbs - Lily, Rehmannia

Lily is sweet in taste and slightly cold in nature, and belongs to the lung and heart meridians. It has the effects of nourishing yin and moistening the lung, clearing the heart and calming the mind. In the prescription, lily can nourish the lung yin and moisten the lung to relieve cough, and is the key herb for treating lung yin deficiency, so it is one of the monarch herbs.

Raw Rehmannia Root is sweet, bitter in taste and cold in nature, and belongs to the heart, liver and kidney meridians. It has the functions of clearing heat and cooling blood, nourishing yin and promoting fluid production. It can both nourish yin and blood to supplement the yin of the liver and kidney, and clear heat and cool blood. It is a commonly used herb for nourishing yin and reducing fire. Combined with lily, it can jointly achieve the effect of nourishing yin and moistening the lung, and is also a monarch herb.

2. Ministerial Herbs - Prepared Rehmannia, Ophiopogon, Scrophularia

Prepared Rehmannia Root is sweet in taste and slightly warm in nature, and belongs to the liver and kidney meridians. It has the effects of nourishing yin and tonifying blood, replenishing essence and marrow. Its power of nourishing yin is stronger, and it can further nourish the yin of the liver and kidney, assisting the monarch herbs to enhance the effect of nourishing yin, so it is a ministerial herb.

Ophiopogon Root is sweet, slightly bitter in taste and slightly cold in nature, and belongs to the heart, lung and stomach meridians. It has the functions of nourishing yin and moistening the lung, promoting fluid production in the stomach, clearing the heart and removing vexation. It can moisten the lung dryness to relieve cough, nourish the stomach yin to promote fluid production, and clear the heart heat to remove vexation. Acting synergistically with lily and raw Rehmannia Root, it strengthens the effect of moistening the lung and nourishing yin, and is an important ministerial herb.

Scrophularia Root is sweet, bitter, salty in taste and slightly cold in nature, and belongs to the lung, stomach and kidney meridians. It can clear heat and cool blood, nourish yin and reduce fire, detoxify and disperse nodules. Its power of clearing heat and detoxifying helps to clear the deficiency heat in the lung. Combined with other yin-nourishing herbs, it enables nourishing yin without retaining pathogenic factors and better plays the therapeutic role of the prescription, and is also a ministerial herb.

3. Assistant Herbs - Angelica, White Peony

Angelica Sinensis is sweet, pungent in taste and warm in nature, and belongs to the liver, heart and spleen meridians. It has the effects of enriching blood and promoting blood circulation, regulating menstruation and relieving pain, moistening the intestines and relaxing bowel. In the prescription, Angelica Sinensis enriches and harmonizes the blood. It can both assist the yin-nourishing herbs to nourish yin and blood, and prevent the yin-nourishing herbs from being too greasy and obstructing the stomach, playing the role of regulating the properties of the herbs, and is an adjuvant herb.

White peony root is bitter, sour, and slightly cold in nature. It belongs to the liver and spleen meridians. It can nourish blood and regulate menstruation, astringe yin and stop sweating, soothe the liver and relieve pain, and suppress liver yang. When combined with angelica sinensis, it enhances the effect of nourishing the liver and soothing the liver, and at the same time helps to coordinate the properties of various herbs in the formula, belonging to the category of assistant herbs.

4. Guide Herb - Platycodon, Licorice

Platycodon grandiflorum is bitter, pungent, and neutral in nature. It belongs to the lung meridian. It can promote the dispersing function of the lung, soothe the throat, resolve phlegm, and drain pus. Platycodon grandiflorum serves as the guiding herb in the formula. It can carry the herbs upward, enabling the medicinal power to directly reach the affected area and act on the lung meridian. At the same time, it can also disperse the lung qi. When combined with herbs that nourish yin and moisten the lung, it is beneficial to the smooth dispersing of lung qi and better发挥 the effect of nourishing yin and moistening the lung to relieve cough.

Licorice root is sweet, neutral in nature, and belongs to the heart, lung, spleen, and stomach meridians. It has the functions of invigorating the spleen and replenishing qi, moistening the lung and relieving cough, clearing heat and detoxifying, and harmonizing various herbs. Licorice root can both moisten the lung and relieve cough and harmonize the properties of various herbs in the formula, making the compatibility of the entire formula more coordinated. Therefore, it is the guiding herb.

III. Pathogenesis, Efficacy and Indications

1. Pathogenesis

The pathogenesis targeted by the Lily Consolidating the Metal Decoction is mainly yin deficiency of the lung and kidney. The lung is in charge of qi and respiration, and the kidney is in charge of receiving qi. The lung and kidney are interrelated, and the lung and kidney generate and nourish each other like metal generating water. If the yin fluid of the lung and kidney is deficient, the lung loses nourishment, resulting in symptoms such as dry cough with little sputum, dry throat and mouth. Insufficient kidney yin, with the upward flaring of deficiency fire, can lead to dizziness, hot flashes and night sweats. In addition, yin deficiency leads to yang hyperactivity, and the deficiency fire burns the lung collaterals, which may also cause symptoms such as hemoptysis.

2. Efficacy

Based on the above pathogenesis, the Lily Consolidating the Metal Decoction has the effects of nourishing the lung and kidney, relieving cough and resolving phlegm. By nourishing the yin of the lung and kidney, the yin fluid of the lung and kidney becomes sufficient, and the deficiency fire is cleared and reduced, thus alleviating various symptoms caused by yin deficiency of the lung and kidney. At the same time, the effect of resolving phlegm and relieving cough can reduce symptoms such as cough and expectoration, achieving the purpose of treating both the symptoms and the root cause.

3. Indications

This decoction is mainly used to treat the syndrome of yin deficiency of the lung and kidney with upward flaring of deficiency fire. Common symptoms include cough and asthma, blood streaks in the sputum, dry and sore throat, dizziness, afternoon hot flashes, red tongue with little coating, thready and rapid pulse, etc. Clinically, it is commonly used to treat chronic bronchitis, pulmonary tuberculosis, hemoptysis due to bronchiectasis, etc. belonging to yin deficiency of the lung and kidney.

IV. Analysis of Formula Principles

1. Moistening Lung with Yin as Main Line

In the formula, nourishing yin herbs such as lily, ophiopogon root, raw rehmannia root, prepared rehmannia root, and scrophularia root are the monarch and minister herbs. They are mutually compatible and mainly nourish the yin of the lung and kidney. Lily and ophiopogon root directly moisten the lung and relieve cough. Raw rehmannia root, prepared rehmannia root, and scrophularia root nourish yin from the liver and kidney. Through the principle of the lung and kidney generating and nourishing each other like metal generating water, they nourish the lung yin, enabling the lung to be nourished by sufficient yin fluid and restoring its normal physiological function, thus alleviating symptoms such as dry cough and dry throat caused by lung yin deficiency.

2. Cooling Blood, Clearing Heat and Reducing Fire

Raw rehmannia root and scrophularia root can both nourish yin and cool blood to clear heat. Targeting the pathogenesis of yin deficiency with excessive fire, they can clear and reduce the deficiency fire. The upward flaring of deficiency fire is likely to cause symptoms such as dry and sore throat, hot flashes and night sweats. The addition of these two herbs can effectively clear the deficiency fire, enabling the yin fluid to be at peace, preventing the deficiency fire from further burning the yin fluid, and maintaining the balance of yin and yang in the body.

3. Nourishing Blood, Harmonizing Blood and Regulating Liver

Angelica sinensis and Paeonia lactiflora enrich the blood and harmonize the blood, soothe the liver and relieve pain. The liver is in charge of storing blood. Insufficiency of kidney yin can lead to deficiency of liver yin, which in turn affects the functions of the liver in storing blood and regulating qi flow. Angelica sinensis and Paeonia lactiflora enrich the blood and nourish yin, regulate the liver, so that the liver qi can be soothed, which helps to smooth the overall qi movement, and at the same time assists the yin-nourishing herbs to play a better role and prevent adverse reactions caused by excessive yin-nourishing.

4. Dispersing Lung Qi, Alleviating Sore Throat and Resolving Phlegm

Platycodon grandiflorum disperses lung qi and benefits the throat, Glycyrrhiza glabra moistens the lungs and relieves cough, and harmonizes all the herbs. Platycodon grandiflorum guides the herbs upward, making the medicinal power directly reach the lung meridian, dispersing lung qi, which is beneficial to the smooth flow of lung qi and improving symptoms such as cough and asthma. Glycyrrhiza glabra harmonizes all the herbs in the formula, synergistically plays the role of moistening the lungs and relieving cough, making the action of the whole formula more coordinated and the medicinal power more concentrated, so as to achieve the purpose of treating cough and expectoration caused by deficiency of yin in the lung and kidney and flaring up of deficient fire.

V. Comparison with Other Similar Formulas

1. Comparison with Shashen Maidong Decoction

Decoction of Adenophora and Ophiopogon also focuses on nourishing yin and moistening the lungs, mainly used for the syndrome of yin deficiency in the lung and stomach caused by dryness. Compared with the Lumbi Solidifying the Metal Decoction, the power of nourishing yin of the Decoction of Adenophora and Ophiopogon is relatively weak, focusing on nourishing the yin of the lung and stomach to relieve symptoms such as dry throat, thirst, and dry cough with little sputum. Its drug composition is relatively simple, mainly including Adenophora stricta, Ophiopogon japonicus, Polygonatum odoratum, Trichosanthes kirilowii, etc., without the drugs for nourishing kidney yin such as Rehmannia glutinosa and Scrophularia ningpoensis and the drugs for nourishing blood and regulating the liver such as Angelica sinensis and Paeonia lactiflora in the Lumbi Solidifying the Metal Decoction. And Lumbi Solidifying the Metal Decoction not only nourishes lung yin, but pays more attention to nourishing kidney yin, taking into account the overall pathogenesis of yin deficiency in both the lung and kidney, and is more suitable for diseases with more complex conditions involving yin deficiency in both the lung and kidney.

2. Comparison with Liuwei Dihuang Pills

Liuwei Dihuang Pills is a classic formula for nourishing kidney yin, mainly targeting the syndrome of kidney yin deficiency. Lily Consolidating Metal Decoction Although it also has the effect of nourishing kidney yin, it emphasizes the simultaneous treatment of the lung and kidney, with moistening the lung and relieving cough as one of the important effects. The drug composition of Liuwei Dihuang Pills mainly includes cooked rehmannia root, cornelian cherry fruit, Chinese yam, oriental water plantain rhizome, poria cocos, and moutan bark, focusing on nourishing kidney yin. On this basis, Lily Consolidating Metal Decoction adds drugs such as lily, ophiopogon root, platycodon root, and licorice root, strengthening the effect of moistening the lung, resolving phlegm, and relieving cough, and is more suitable for patients with yin deficiency of the lung and kidney accompanied by symptoms such as coughing and expectoration.

VI. Clinical Applications and Indications

1. Respiratory Diseases

In the treatment of chronic bronchitis, if the patient shows symptoms of yin deficiency of the lung and kidney, such as repeated coughing, scanty and sticky sputum, accompanied by dry throat, dry mouth, soreness and weakness of the waist and knees, tidal fever and night sweats, Lily Consolidating Metal Decoction can be selected. It can nourish the yin of the lung and kidney, relieve cough symptoms, reduce sputum secretion, improve the patient's immunity, and improve lung function.

For pulmonary tuberculosis patients, when there are manifestations of yin deficiency of the lung and kidney such as dry cough with hemoptysis, afternoon tidal fever, night sweats, flushed cheeks, red tongue with scanty coating, Lily Consolidating Metal Decoction is also one of the commonly used prescriptions. Its effect of nourishing yin and moistening the lung, cooling blood and stopping bleeding helps to relieve the symptoms of pulmonary tuberculosis, promote the healing of lesions, and improve the patient's quality of life.

For hemoptysis due to bronchiectasis belonging to yin deficiency of the lung and kidney, Lily Consolidating Metal Decoction can also be applied. The yin-nourishing drugs in the prescription can nourish the lung and kidney, moisten the lung collaterals, and the drugs for cooling blood and clearing heat can clear and descend the deficiency fire, reducing the occurrence of hemoptysis symptoms. Platycodon root and licorice root can also relieve cough, resolve phlegm, and regulate the lung qi, comprehensively improving the condition.

2. Throat Diseases

In the treatment of chronic pharyngitis, if the patient shows symptoms of yin deficiency of the lung and kidney such as dry throat, itchy throat, slight pain, dry cough with scanty sputum, feverish sensation in the palms and soles, red tongue with scanty coating, Lily Consolidating Metal Decoction can exert the effects of nourishing yin and reducing fire, relieving sore throat and relieving cough. By nourishing the yin of the lung and kidney, it can reduce the state of hyperactivity of fire due to yin deficiency in the throat and relieve the discomfort symptoms of the throat.

For throat diseases such as vocal nodules and vocal polyps, if accompanied by manifestations of yin deficiency of the lung and kidney, such as hoarseness, dry throat, soreness and weakness of the waist and knees, Lily Consolidating Metal Decoction can also be used as an adjuvant treatment prescription. Its yin-nourishing effect helps to improve the local nutritional status of the vocal cords, promote the repair of lesions, and at the same time regulate the state of yin deficiency of the lung and kidney throughout the body.

VII. Modified Baihe Gujin Decoction

1. Those with severe cough

Almond and fritillary bulb can be added to enhance the power of relieving cough and resolving phlegm. Almond can lower qi, relieve cough and asthma, and fritillary bulb can clear heat, resolve phlegm, moisten the lung and relieve cough. When combined with the original prescription, they can more effectively relieve cough symptoms, make the lung qi descend and disperse normally, and the sputum is discharged smoothly.

2. Those with more hemoptysis

Add drugs for cooling blood and stopping bleeding such as Imperatae Rhizoma, Agrimoniae Herba, and Biotae Folium. Imperatae Rhizoma clears heat and cools blood, stopping bleeding without leaving stasis; Agrimoniae Herba arrests bleeding with astringents and tonifies deficiency and strengthens the body; Biotae Folium cools blood and stops bleeding, resolving phlegm and relieving cough. These drugs can enhance the effect of the prescription in cooling blood and stopping bleeding, effectively control the symptom of hemoptysis, and prevent excessive bleeding from further consuming yin blood.

3. Those with obvious fever and night sweats

Add Anemarrhenae Rhizoma and Phellodendri Cortex to nourish yin and reduce fire, clearing heat and eliminating steaming. Anemarrhenae Rhizoma clears heat and purges fire, nourishing yin and moistening dryness; Phellodendri Cortex clears heat and dries dampness, purges fire and detoxifies, reducing deficiency heat. The combination of the two can enhance the efficacy of clearing and reducing deficiency fire, alleviate symptoms of yin deficiency and excessive fire such as hectic fever and night sweats, and restore the balance of yin and yang in the patient's body.

4. If severe lung yin deficiency, no phlegm cough

Lilium Brownii can be used in large doses, and Glehniae Radix and Polygonati Odorati Rhizoma can be added to enhance the effect of moistening the lung and nourishing yin. Glehniae Radix nourishes yin and moistens the lung, promoting the production of fluid to quench thirst; Polygonati Odorati Rhizoma nourishes yin and moistens dryness, promoting the production of fluid to relieve thirst. Increasing the dosage of these drugs can more specifically nourish lung yin, relieve the dry cough symptom caused by lung yin deficiency, and gradually restore the normal function of the lung.

VIII. Dosage (Traditional and Modern Concentrated Granules)

1. Traditional method

The traditional usage of the Lily Decoction to Strengthen the Metal is to decoct it in water for oral administration. Generally, after weighing each medicinal flavor in the prescription according to the specified dosage, add an appropriate amount of water, soak for a period of time, then bring to a boil with strong fire, and then change to slow fire for simmering. Take the decoction in several warm doses. For example, the common dosage is three qian each of Lilium Brownii, Rehmanniae Radix Recens, Rehmanniae Radix Praeparata, Ophiopogonis Radix, and Scrophulariae Radix, and one and a half qian each of Angelicae Sinensis Radix, Paeoniae Radix Alba, Platycodonis Radix, and Glycyrrhizae Radix. The specific dosage can be appropriately adjusted according to factors such as the patient's age, constitution, and condition.

2. Modern concentrated granules

With the development of modern pharmaceutical technology, there is also a concentrated granule dosage form of the Lily Decoction to Strengthen the Metal. When using modern concentrated granules, just take them with boiling water according to the dosage specified in the instructions. This dosage form is convenient and fast, easy to store and take, and suitable for the modern fast-paced lifestyle. However, during the use process, it is also necessary to reasonably adjust the dosage and treatment course according to the specific situation of the patient, following the principle of syndrome differentiation and treatment in traditional Chinese medicine.

IX. Precautions and Taboos

1. Dietary Taboos

During the period of taking the Lily Decoction to Strengthen the Metal, spicy, greasy, and stimulating foods such as chili peppers, fried foods, strong tea, and coffee should be avoided. These foods are likely to assist fire and generate heat, aggravating the symptoms of yin deficiency and excessive fire in the body, and are not conducive to the recovery of the disease. At the same time, smoking and alcohol should be abstained from to avoid the stimulation of the throat and lungs by tobacco and alcohol, which may affect the therapeutic effect of the prescription.

2. Physical Constitution Differences

Those with deficiency-cold in the spleen and stomach and internal obstruction of phlegm-dampness should use the Lily Decoction to Strengthen the Metal with caution. Because most of the drugs in the prescription are products for nourishing yin and clearing heat, with a relatively cold nature. For patients with deficiency-cold in the spleen and stomach and heavy phlegm-dampness, it may further damage the yang qi of the spleen and stomach, leading to a weakened function of the spleen and stomach in transportation and transformation, and symptoms such as discomfort in the epigastrium, abdominal distension, and loose stools may occur. If such patients need to take medicine, they should, under the guidance of a doctor, make appropriate adjustments according to the specific situation or combine with drugs for strengthening the spleen and resolving dampness.

3. Special Populations

Special populations such as pregnant women, lactating women, and children should be particularly cautious when using the Lily Decoction to Strengthen the Metal. When using drugs during pregnancy, the impact on the fetus needs to be considered. When using drugs during lactation, they may be transmitted to the baby through breast milk. When using drugs for children, the dosage needs to be accurately adjusted according to factors such as their age and weight. If these populations need to use this prescription, they must do so under the guidance of a professional doctor to ensure the safety of medication.

X. Modern Research Progress

1. Pharmacological Action Research

Modern research shows that various drug components in Baihe Gujin Decoction have extensive pharmacological effects. For example, components such as polysaccharides in lily have immunomodulatory effects, which can enhance the body's immunity and help resist diseases. Rehmannia polysaccharides in raw Rehmannia root and prepared Rehmannia root can regulate blood sugar and blood lipids, improve hemorheological indexes, and have a certain protective effect on the cardiovascular system. Ophiopogon japonicus polysaccharides in Ophiopogon japonicus have antioxidant and anti-inflammatory effects, which can reduce tissue inflammatory responses. Components such as scrophularin in Scrophularia ningpoensis have antibacterial and antiviral effects and can inhibit the growth and reproduction of various pathogens. These pharmacological effects provide a scientific basis for the treatment of related diseases with Baihe Gujin Decoction.

2. Clinical Efficacy Verification

In clinical practice, multiple studies have confirmed the effectiveness of Baihe Gujin Decoction. For respiratory diseases such as chronic bronchitis and pulmonary tuberculosis, treating with Baihe Gujin Decoction can effectively relieve symptoms such as cough, expectoration, and hemoptysis, improve lung function, and enhance the quality of life of patients. In terms of throat diseases, Baihe Gujin Decoction also has a certain therapeutic effect on chronic pharyngitis, vocal cord nodules, etc., which can relieve throat discomfort and promote the recovery of lesions. Through modern clinical research, the advantages and application value of Baihe Gujin Decoction in treating diseases related to yin deficiency of the lung and kidney have been further clarified.

3. Dosage Form Improvement and Innovation

With the continuous progress of modern technology, the dosage form improvement and innovation of Baihe Gujin Decoction are also being continuously explored. In addition to the modern concentrated granule dosage form mentioned above, some people have also studied and developed oral liquids, capsules and other dosage forms of Baihe Gujin Decoction. On the basis of maintaining the efficacy of the prescription, these new dosage forms further improve the stability and convenience of taking the medicine, providing more choices for patients. At the same time, the research of some traditional Chinese medicine compound preparations also draws on the formula idea of Baihe Gujin Decoction, combines the modern pharmacological research results, and develops new drugs with more pertinence and effectiveness, injecting new vitality into the modern development of traditional Chinese medicine.

Summary

Baihe Gujin Decoction is a classic prescription for nourishing the lung and kidney and moistening the lung to stop cough, with the functions of resolving phlegm and stopping cough, clearing heat and resolving phlegm to stop cough, nourishing yin and clearing heat to nourish the lung and protect the kidney. It is applicable to syndromes such as cough and asthma, hemoptysis, and dry and painful throat caused by yin deficiency of the lung and kidney, deficiency of yin in the lung and kidney, and flaring up of deficiency fire. In the formula, lily with sweet, bitter and slightly cold nature is the monarch drug, Ophiopogon japonicus with sweet and cold nature, Scrophularia ningpoensis with salty and cold nature, raw Rehmannia root and prepared Rehmannia root nourishing the yin and blood of the lung and kidney are the ministerial drugs, combined with white peony root to nourish blood and regulate blood, angelica sinensis to treat cough and dyspnea, fritillaria cirrhosa to resolve phlegm and dissipate nodules, platycodon grandiflorum as the adjuvant drug, and raw licorice root to clear heat and purge fire, harmonize all the drugs as the guiding drug. When all the drugs are used together, they regulate both the lung and kidney qi, take into account both the root and the branch, and are decocted for oral administration, showing good curative effect on resolving phlegm and stopping cough.