1. Prescription Source & History

1. Yang Yin Qing Fei Tang Origin Background

The Yang Yin Qing Fei Decoction originated from 'Chonglou Yuyue' written by the famous medical expert Zheng Meijian in the Qing Dynasty. In the medical environment at that time, for some diseases with deficiency of lung yin and accompanied by symptoms of dryness and heat, the traditional treatment methods might not be very effective. Through long-term clinical practice and in-depth study of traditional Chinese medicine theory, Zheng Meijian summarized the effective prescription of Yangyin Qingfei Decoction. At that time, with the changes in climate, lifestyle, and the evolution of the disease spectrum, there were more diseases in the lung system with the main pathogenesis of yin deficiency and dryness-heat, and the Yangyin Qingfei Decoction came into being, providing new ideas and methods for the treatment of such diseases.

2. Historical Inheritance

Since the publication of 'Chonglou Yuyue', the Yangyin Qingfei Decoction has been widely applied and inherited in clinical practice of traditional Chinese medicine. Later generations of medical experts continuously verified and improved it during the application process. Many traditional Chinese medicine classics recorded this prescription and made appropriate adjustments and supplements according to different clinical situations. It played an important role in the treatment of throat diseases such as diphtheria. Over time, its application scope gradually expanded to other various diseases with symptoms of yin deficiency and dryness of the lung, becoming one of the classic prescriptions for traditional Chinese medicine to treat such diseases, remaining effective for hundreds of years and witnessing the inheritance and development of traditional Chinese medicine formulaology.

2. Yang Yin Qing Fei Tang Composition of Medicinal Flavors

1. Monarch Drug: Rehmannia Root

Rehmannia glutinosa has a powerful effect of nourishing yin and promoting blood circulation. It can nourish the kidney yin, and sufficient kidney yin can nourish the lung yin upward, making the lung yin sufficient. The components such as rehmannia polysaccharide it contains help promote the generation of body yin fluid, provide sufficient nutrients for the lungs, and improve the condition of lung yin deficiency. At the same time, Rehmannia glutinosa can cool the blood and clear heat, and has a certain effect of clearing away the pathogenic heat in the lungs, clearing away the blood heat caused by dryness and heat, preventing the pathogenic heat from further burning the lung yin, making the lungs in a relatively cool environment, which is beneficial to the restoration of the normal physiological functions of the lungs.

2. Ministerial Drug: Ophiopogon Root

Ophiopogon japonicus tastes sweet, slightly bitter, is slightly cold in nature, and belongs to the heart, lung, and stomach meridians. It can moisten the lungs and nourish yin, and has a good relieving effect on symptoms such as dry cough and dry throat caused by insufficient lung yin. Components such as ophiopogon polysaccharide in Ophiopogon japonicus can increase the water content in lung tissues, improve the dry state of the lungs, and enhance the moistening function of the lungs. At the same time, Ophiopogon japonicus can also benefit the stomach and promote the production of body fluid. By nourishing the stomach yin, it indirectly provides support for the supplementation of lung yin, enabling the yin of the lungs and stomach to nourish each other and jointly maintain the balance of body yin fluid.

3. Assistant Drug: Scrophularia Root

Scrophularia ningpoensis has the effects of clearing heat, cooling the blood, and detoxifying, and can assist Rehmannia glutinosa in clearing away the heat-toxin in the lungs. For symptoms of heat-toxin accumulation caused by lung dryness, such as sore throat, Scrophularia ningpoensis can play its role in clearing heat and detoxifying, reducing the local inflammatory reaction. At the same time, its effect of cooling the blood also helps prevent the pathogenic heat from further damaging the lung yin. Scrophularia ningpoensis can also nourish yin and reduce fire. Its power of nourishing yin can enhance the overall effect of nourishing yin in the prescription, and the effect of reducing fire can inhibit the upward inflammation of deficient fire in the lungs, enabling the functions of the lungs to return to normal.

4. Assistant Drug: Fritillaria Thunbergii

Fritillaria cirrhosa is divided into Fritillaria cirrhosa D. Don and Fritillaria thunbergii Miq. Generally, Fritillaria cirrhosa D. Don is often used in the Yangyin Qingfei Decoction. Fritillaria cirrhosa D. Don can moisten the lungs and resolve phlegm, and has a good therapeutic effect on symptoms such as dry cough with lung dryness and difficult expectoration. It can dilute phlegm, making phlegm easier to expectorate. At the same time, its function of moistening the lungs can relieve the irritation of lung dryness to the respiratory tract and reduce cough symptoms. In addition, Fritillaria cirrhosa D. Don also has the effect of dissipating nodules and reducing swelling. In some diseases with local nodules or masses caused by lung dryness, Fritillaria cirrhosa D. Don can promote local qi and blood circulation through its effect of dissipating nodules, disperse nodules, and help improve the condition.

5. Assistant Drug: Cortex Moutan

Moutan cortex has the effect of clearing heat and cooling the blood, and can clear away the pathogenic heat in the blood aspect. It has a certain therapeutic effect on the situation where the dryness and heat in the lungs spread to the blood aspect and cause blood to flow erratically. In the Yangyin Qingfei Decoction, Moutan cortex can prevent the pathogenic heat from further penetrating into the blood aspect, protect the yin fluid from being overly consumed by the pathogenic heat, and maintain the normal operation of the blood. At the same time, Moutan cortex also has the effect of promoting blood circulation and removing blood stasis, can improve local blood circulation, helps promote the repair and functional recovery of lung tissues, makes the qi and blood circulation in the lungs smoother, and is beneficial to the nourishment and distribution of yin fluid.

6. Guiding Drug: Mentha Haplocalyx

Mentha haplocalyx tastes pungent, is cool in nature, and has the effect of dispersing wind-heat. In the Yangyin Qingfei Decoction, it can disperse the pathogenic wind-heat in the lung meridian, prevent exogenous pathogenic factors from further aggravating the condition of lung dryness, and at the same time can also relieve symptoms such as sore throat caused by wind-heat. Mentha haplocalyx can also benefit the throat and promote the eruption of rash. It has a certain therapeutic effect on the situation of uncomfortable throat and unsmooth eruption of rash. It can make the lung qi smooth through its pungent and dispersing nature, help the eruption of rash toxin, and at the same time reduce the discomfort of the throat, making the prescription more comprehensive and effective in treating diseases with deficiency of lung yin and concurrent exogenous wind-heat.

4. Guiding Drug: Mentha Haplocalyx

Peppermint is pungent in flavor and cool in nature, and has the function of dispersing wind-heat. In the Yangyin Qingfei Decoction, it can disperse the pathogenic factors of wind-heat in the lung meridian, prevent exogenous pathogenic factors from further aggravating the dryness of the lung, and at the same time relieve symptoms such as sore throat caused by wind-heat. Peppermint can also benefit the throat and promote eruption of measles, enabling the lung qi to be diffused smoothly, making the prescription more comprehensive and effective in treating the syndrome of deficiency of lung yin complicated by exogenous wind-heat.

III. Pathogenesis, Efficacy and Principal Treatment

1. Pathogenesis

Yangyin Qingfei Decoction The pathogenesis targeted by the Yangyin Qingfei Decoction is mainly yin deficiency with dryness of the lung. Due to various reasons, such as exogenous dry pathogenic factors, prolonged internal illness, overexertion, emotional disorders, etc., it leads to deficiency of lung yin. When the lung yin is insufficient and the lung loses nourishment, symptoms such as dry cough, dry throat, and dry mouth will appear. The lung is a delicate organ, preferring moistness and hating dryness. Yin deficiency leads to dryness, and endogenous dry pathogenic factors further damage lung yin, forming a vicious cycle. Yin deficiency fails to control yang, generating internal deficiency fire, which flares up to the lung. The deficiency fire burns the lung collaterals, resulting in symptoms such as sore throat and hemoptysis. At the same time, the deficiency fire also affects the normal diffusing and descending functions of the lung, causing the lung qi to reverse upward and aggravating symptoms such as cough.

2. Efficacy

3. Indications

The Yangyin Qingfei Decoction was mainly used to treat diphtheria in history. Diphtheria is an acute respiratory infectious disease caused by Corynebacterium diphtheriae, characterized by white patches like rotten matter in the throat that are not easily wiped off, accompanied by symptoms such as fever and sore throat. In addition, for cough and hemoptysis caused by yin deficiency with dryness of the lung, the Yangyin Qingfei Decoction also has good curative effects. Deficiency of lung yin and loss of moistening and clearing of the lung lead to incessant cough, and the deficiency fire burns the lung collaterals causing hemoptysis. For some diseases such as chronic bronchitis and pharyngitis belonging to the syndrome type of yin deficiency with dryness of the lung, the Yangyin Qingfei Decoction can also be appropriately added or subtracted according to specific symptoms to achieve better therapeutic effects.

IV. Analysis of Recipe Meaning of Yangyin Qingfei Decoction

1. Combine Yin-nourishing and Heat-clearing

In the Yangyin Qingfei Decoction, the yin-nourishing herb Rehmannia glutinosa is the monarch herb, and Ophiopogon japonicus, Scrophularia ningpoensis, etc. are adjuvant herbs, jointly playing the role of nourishing yin, fundamentally supplementing the lung yin and nourishing the lung. At the same time, heat-clearing herbs such as Moutan cortex and Fritillaria thunbergii are also indispensable. When there is yin deficiency in the lung, it is easy to generate dryness and heat. Heat-clearing herbs can clear the dryness and heat pathogenic factors in the lung, prevent heat pathogenic factors from further damaging yin fluid. The combination of nourishing yin and clearing heat treats both the symptoms and the root cause to correct the pathological state of yin deficiency with dryness of the lung complicated by upward flaring of deficiency fire.

2. Combine Dispersing and Astringing

As the guiding herb, peppermint has the effect of dispersing wind-heat, can disperse the pathogenic factors of wind-heat in the lung meridian, enabling the exogenous pathogenic factors on the surface to be dispersed, and preventing exogenous pathogenic factors from further entering the interior and aggravating the condition. At the same time, other herbs in the prescription such as Rehmannia glutinosa and Ophiopogon japonicus, etc., which are yin-nourishing herbs, also contribute to the restoration of the descending function of the lung during the process of nourishing the lung yin. The lung governs diffusing and descending. When there is deficiency of lung yin, the diffusing and descending functions are abnormal. The combination of the dispersing effect of peppermint and the descending effect of yin-nourishing herbs regulates the qi movement of the lung, enabling the lung qi to diffuse normally to expel pathogenic factors and descend orderly to nourish the lung, maintaining the normal physiological functions of the lung.

3. Treat Qi and Blood Simultaneously

In the prescription, Moutan cortex not only has the effect of clearing heat and cooling blood, but also has the effect of promoting blood circulation and removing blood stasis. In the pathological state of deficiency of lung yin, the qi and blood circulation of the lung may also be affected, showing the situation of qi and blood stagnation. Moutan cortex promotes blood circulation and removes blood stasis, improves the blood circulation of the lung, enables the qi and blood to circulate smoothly, which is beneficial to the nourishment and distribution of yin fluid. At the same time, yin-nourishing herbs such as Rehmannia glutinosa also provide the material basis for the normal circulation of qi and blood during the process of nourishing yin and blood. Treating both qi and blood simultaneously helps to comprehensively improve the functions of the lung and promote the recovery of the disease.

V. Comparison with Other Similar Formulas

1. Comparison with Baihe Gujin Decoction

Lily Consolidating the Metal Decoction is composed of lily, raw rehmannia root, prepared rehmannia root, ophiopogon root, scrophularia root, fritillaria cirrhosa, platycodon root, licorice root, angelica sinensis, and paeonia lactiflora. Compared with the Yin-Nourishing and Lung-Clearing Decoction, it has prepared rehmannia root, angelica sinensis, paeonia lactiflora, platycodon root, and licorice root added, and mentha haplocalyx removed. Lily Consolidating the Metal Decoction focuses on nourishing the yin of the lung and kidney, with relatively stronger yin-nourishing power, and has the effects of nourishing blood and relieving cough and resolving phlegm. Its efficacy emphasizes nourishing the lung and kidney, relieving cough and resolving phlegm, and is applicable to symptoms such as cough with asthma, blood-streaked sputum due to yin deficiency of the lung and kidney and flaring-up of deficient fire. While the Yin-Nourishing and Lung-Clearing Decoction mainly focuses on nourishing yin and clearing the lung, detoxifying and relieving the throat, targeting diseases such as diphtheria with yin deficiency of the lung and dryness and heat-toxin accumulation, and its effect of detoxifying and relieving the throat is more prominent.

2. Comparison with Qingzao Jiufei Decoction

The Dryness-Removing and Lung-Saving Decoction is composed of mulberry leaf, gypsum, ginseng, licorice root, semen sesami nigrum, donkey-hide gelatin, ophiopogon root, almond, and eriobotrya japonica leaf. The Dryness-Removing and Lung-Saving Decoction mainly functions to clear heat and moisten dryness, benefit qi and nourish yin, contains more herbs for clearing heat and purging fire and benefiting qi, and is applicable to the syndrome of damage to the lung by warm dryness and impairment of qi and yin, mainly manifested as fever, headache, dry cough without phlegm, and dyspnea with reversed flow of qi. The Yin-Nourishing and Lung-Clearing Decoction mainly targets the situation of yin deficiency of the lung with dryness and heat-toxin accumulation, and emphasizes the treatment of heat-toxin diseases and throat symptoms based on deficiency of lung yin. In the Dryness-Removing and Lung-Saving Decoction, gypsum clears heat and purges fire, and ginseng benefits qi, focusing on clearing away the dryness and heat in the lung and supplementing qi and yin; in the Yin-Nourishing and Lung-Clearing Decoction, herbs for nourishing yin such as raw rehmannia root are the main ones, combined with herbs for clearing heat, detoxifying, and relieving the throat, with the emphasis on nourishing lung yin and clearing away heat-toxin.

VI. Clinical Applications and Indications

1. Diphtheria

Patients with diphtheria usually present with a grayish-white false membrane in the throat, which is not easily wiped off. Forcible peeling is likely to cause bleeding, accompanied by symptoms such as fever and sore throat. In severe cases, hoarseness and shortness of breath may occur. The Yin-Nourishing and Lung-Clearing Decoction relieves the symptoms of diphtheria through the effects of nourishing yin and clearing the lung, detoxifying and relieving the throat, promotes the shedding of the false membrane, and restores the normal function of the throat.

2. Cough and Hemoptysis due to Yin Deficiency and Lung Dryness

These patients mainly manifest as dry cough with little phlegm, or blood-streaked sputum, dry throat and mouth, afternoon tidal fever, night sweats, etc. When applying the Yin-Nourishing and Lung-Clearing Decoction, the dosage of the medicine can be adjusted appropriately according to the degree of hemoptysis. For those with more severe hemoptysis, drugs for cooling blood and stopping bleeding, such as radix sanguisorbae and rhizoma imperatae, can be added.

VII. Modifications

1. Severe Sore Throat

Drugs such as belamcanda chinensis and sophora subprostrata can be added. Belamcanda chinensis has the effects of clearing heat and detoxifying, resolving phlegm and relieving the throat, and can effectively relieve the symptoms of sore throat. Sophora subprostrata has relatively strong power in clearing heat and detoxifying, and has a good therapeutic effect on the swelling and pain caused by excessive heat-toxin in the throat. Adding these two herbs to the Yin-Nourishing and Lung-Clearing Decoction can enhance the efficacy of the decoction in detoxifying and relieving the throat, relieve the throat pain more quickly, and promote the subsidence of throat inflammation. For example, when the patient has obvious throat swelling and pain and difficulty in swallowing, adding belamcanda chinensis 10 grams and sophora subprostrata 6 grams to the original formula can better exert the therapeutic effect of the decoction and relieve the patient's pain.

2. More Severe Hemoptysis

Add drugs for cooling blood and stopping bleeding such as radix sanguisorbae and rhizoma imperatae. Radix sanguisorbae has the effects of cooling blood and stopping bleeding, detoxifying and astringing ulcers, and rhizoma imperatae can clear heat and cool blood, promote diuresis and relieve stranguria. Both have good effects on cooling blood and stopping bleeding. For the situation of more hemoptysis caused by yin deficiency of the lung and dryness, adding these two herbs can enhance the hemostatic effect of the decoction and prevent adverse consequences such as qi and blood deficiency caused by excessive bleeding. For example, if the patient has continuous hemoptysis, 15 grams of radix sanguisorbae and 30 grams of rhizoma imperatae can be added to the Yin-Nourishing and Lung-Clearing Decoction to control the hemoptysis symptoms as soon as possible and stabilize the condition.

3. Obvious Fever with Night Sweats

Drugs such as concha ostreae and fructus tritici levigati can be added. Concha ostreae has the effects of suppressing the hyperactive liver and subsiding yang, nourishing yin, and softening hardness and dissipating nodules, and fructus tritici levigati can benefit qi, remove heat, and stop sweating. For patients with yin deficiency of the lung and dryness accompanied by tidal fever and night sweats, adding these two herbs can play the role of astringing yin and stopping sweating, clearing away deficiency heat, improve the patient's symptoms, and regulate the balance of yin and yang in the body. For example, when the patient's symptoms of tidal fever and night sweats are more prominent, adding 20 grams of concha ostreae and 30 grams of fructus tritici levigati to the original formula helps relieve the patient's discomfort and improve the quality of life.

VIII. Dosage and Administration

1. Traditional Method

In ancient times, the usage of the Yin-Nourishing and Lung-Clearing Decoction was generally to decoct it with water. After weighing the herbs such as raw rehmannia root, ophiopogon root, scrophularia root, fritillaria cirrhosa, cortex moutan, and mentha haplocalyx according to a certain dosage, put them into a casserole, add an appropriate amount of water and soak for a period of time, and then decoct slowly with a slow fire. Generally decoct twice. After mixing the medicinal liquid decocted for the first time and the medicinal liquid decocted for the second time, take it warm in several doses. The specific dosage will be adjusted according to factors such as the patient's age and condition. In modern clinical applications, generally, 12 - 15 grams of raw rehmannia root, 9 - 12 grams of ophiopogon root, 9 - 12 grams of scrophularia root, etc. are used in proportion.

2. Modern Concentrated Granules

In modern times, there is a concentrated granule dosage form of Yangyin Qingfei Decoction. This dosage form is more convenient and faster. Patients only need to take it with boiling water according to the instructions. Its dosage is generally converted according to the traditional dosage, and the specific dosage can be consulted with a doctor. The concentrated granules maintain the efficacy of the traditional prescription, reduce the trouble of patients decocting medicine by themselves, and improve the compliance of taking medicine. In clinical application, doctors will select the appropriate dosage form, usage and dosage according to the individual conditions of patients to ensure the treatment effect.

IX. Precautions and Taboos

1. Dietary Taboos

During the period of taking Yangyin Qingfei Decoction, spicy, hot, greasy and other stimulating foods should be avoided, such as chili, Chinese prickly ash, fried foods, etc. These foods may aggravate the pathogenic heat in the lungs and affect the treatment effect of the prescription. At the same time, raw and cold foods should also be avoided to avoid damaging the spleen and stomach. The diet should be kept light, and moistening foods such as pears, tremella, lilies, etc. should be eaten more, which is helpful to nourish the lung yin and promote the recovery of the disease.

2. Special Populations

Pregnant women, lactating women, children and the elderly and the infirm should consult a doctor before using Yangyin Qingfei Decoction. Pregnant women need to use drugs carefully to avoid adverse effects on the fetus; the physiological functions of children and the elderly and the infirm are different from those of adults, and the dosage and usage of drugs need to be adjusted according to individual conditions. It must be used under the guidance of a doctor.

3. Caution for Spleen-Stomach Deficiency-Cold

Most of the drugs in Yangyin Qingfei Decoction are on the cool and cold side. For patients with spleen and stomach deficiency-cold, loose stools and loss of appetite, it should be used with caution or under the guidance of a doctor. If it needs to be used, some drugs for warming the middle-jiao and strengthening the spleen can be appropriately combined to prevent the cool and cold drugs from damaging the yang qi of the spleen and stomach and affecting the digestive function.

4. Adjustment According to Symptoms

During the process of using Yangyin Qingfei Decoction, the medication should be adjusted at any time according to the specific symptom changes of the patient. If the condition changes, such as the symptoms worsen or new symptoms appear, medical treatment should be sought in time. The doctor should re-evaluate the condition and adjust the treatment plan. Do not increase or decrease the drug dosage by yourself or continue to take it blindly.

X. Modern Research Progress

1. Research on Pharmacological Effects

Modern research shows that each drug in Yangyin Qingfei Decoction has a variety of pharmacological effects. Rehmannia glutinosa contains components such as Rehmannia glutinosa polysaccharide, which has effects such as immune regulation, antioxidant, hypoglycemic, etc.; Ophiopogon japonicus polysaccharide can enhance the body's immunity and improve lung function; Scrophularia ningpoensis has anti-inflammatory and antibacterial effects; Fritillaria cirrhosa contains a variety of alkaloids, which has effects such as relieving cough, reducing phlegm, anti-inflammatory, etc.; Paeonol in Cortex Moutan has effects such as anti-inflammatory, anti-allergic, antibacterial, etc.; Mentha haplocalyx contains menthol, which has effects such as cooling, antibacterial, anti-inflammatory, etc. These pharmacological effects jointly explain the mechanism of Yangyin Qingfei Decoction in treating various diseases clinically.

2. Clinical Research

In recent years, many clinical studies have verified and observed the curative effect of Yangyin Qingfei Decoction. In the treatment of diphtheria, Yangyin Qingfei Decoction can effectively promote the shedding of the false membrane, relieve symptoms such as sore throat, etc., and promote the recovery of the disease by nourishing yin and clearing the lung, detoxifying and relieving the throat. In terms of cough with hemoptysis due to yin deficiency and dryness of the lung, Yangyin Qingfei Decoction can effectively improve the symptoms of dry cough, blood streaks in the sputum, dryness of the throat and mouth, etc. of patients, nourish the lung yin, clear away the deficiency-fire, and achieve good clinical effects. For diseases such as chronic bronchitis and pharyngitis belonging to the syndrome type of yin deficiency and dryness of the lung, the treatment with modification of Yangyin Qingfei Decoction has also achieved positive treatment effects.

3. Application Expansion

With the deepening of research, the application scope of Yangyin Qingfei Decoction is also constantly expanding. In addition to traditional lung diseases, Yangyin Qingfei Decoction also has potential application value in some skin diseases, diabetic complications, etc. For example, for some skin diseases of yin deficiency and heat dryness type, such as skin dryness and dry mouth caused by Sjogren's syndrome, Yangyin Qingfei Decoction may play a certain improvement role by nourishing yin fluid, clearing heat and moistening dryness. In the future, Yangyin Qingfei Decoction is expected to play its therapeutic role in more fields and make greater contributions to human health.

Conclusion

Yang Yin Qing Fei Tang, also known as Qing Fei Tang, is a classical formula in traditional Chinese medicine that nourishes yin and clears lung heat. It is specifically indicated for patterns of yin deficiency and dryness or yin deficiency and dryness-heat affecting the lung and kidney yin.

The formula nourish yin, clear the lung, and cools the blood to relieve sore throat, dry cough, dry nose, and rapid pulse while supporting overall respiratory health and throat health. It is widely used for chronic pharyngitis and acute tonsillitis. Key ingredients include sheng di huang, mai men dong, mu dan pi, xuan shen, and bo he, which work synergistically to restore lung qi balance and moisten dryness.