1. Prescription Source & History

1. Ancient Doctors' Wisdom

Yunu Decoction comes from 'Complete Works of Jingyue' written by Zhang Jiebin, a famous medical scientist in the Qing Dynasty. Zhang Jiebin, with the courtesy name Jingyue and the literary name Tongyizi, was an outstanding medical scientist in the Ming Dynasty. He had in-depth research and made outstanding contributions to traditional Chinese medicine theory and clinical practice. 'Complete Works of Jingyue' is a summary of his academic thoughts in his life, with rich content covering many aspects such as basic theory of traditional Chinese medicine, diagnostics, and formulaology. As one of the classic formulas in it, Yunu Decoction condenses Zhang Jiebin's medical wisdom and still plays an important role in traditional Chinese medicine clinical practice after hundreds of years of clinical verification.

2. Prescription Inheritance & Development

Since the advent of Yunu Decoction, it has been widely spread in the field of traditional Chinese medicine, and successive medical scientists have continuously studied and applied it. Many medical scientists have made additions, subtractions, and modifications to the formula according to their clinical practice experience to adapt to different diseases and patient constitutions. For example, when treating the disease of excessive fire in the stomach and deficiency of kidney yin, some medical scientists will appropriately increase the dosage of drugs for clearing heat and purging fire or nourishing yin and tonifying the kidney according to the specific conditions of the patients, making the curative effect of the formula more significant. This inheritance and development enable Yunu Decoction to keep pace with the times and better serve clinical treatment.

2. Composition of Medicinal Herbs

1. Monarch Herb - Gypsum

Gypsum is the monarch drug in Yunu Decoction. It is extremely cold in nature, sweet and pungent in flavor. It belongs to the lung and stomach meridians. It has the effects of clearing heat and purging fire, removing vexation and quenching thirst. Gypsum is heavy in texture and is good at clearing the excess heat in the qi aspect of the lung and stomach meridians. In the formula, it can quickly remove the high fever, vexation, thirst and other symptoms caused by excessive fire in the stomach, laying a foundation for treating diseases. For example, for symptoms such as gum swelling and pain, bad breath caused by the upward inflammation of stomach fire, the effect of clearing heat and purging fire of gypsum can effectively relieve these discomforts.

2. Minister Herb - Rehmannia

Prepared Rehmannia Root is the ministerial drug, sweet in flavor and slightly warm in nature. It belongs to the liver and kidney meridians. It has the functions of nourishing yin and blood, replenishing essence and marrow. Prepared Rehmannia Root is sticky in texture and can nourish the yin of the liver and kidney, replenish essence and marrow. In Yunu Decoction, combined with gypsum, it can not only restrict the cold nature of gypsum, but also nourish the kidney yin to prevent excessive stomach fire from burning the kidney yin. For patients with deficiency of kidney yin and internal heat due to yin deficiency, the nourishing yin effect of prepared Rehmannia Root can play a good conditioning role, making the yin and yang of the human body reach balance.

3. Assistant Herb - Ophiopogon

Ophiopogon Root is the adjuvant drug, sweet and slightly bitter in flavor and slightly cold in nature. It belongs to the heart, lung and stomach meridians. It has the effects of nourishing yin and moistening the lung, promoting the production of fluid to relieve thirst, and clearing the heart to remove vexation. Ophiopogon Root can assist prepared Rehmannia Root to enhance the effect of nourishing yin and moistening dryness, and at the same time can clear the heat of the heart and lung. It can play a unique role in treating the disease of excessive fire in the stomach combined with deficiency of heart and lung yin with heat. For example, when patients have symptoms such as vexation, thirst, dry throat, etc., Ophiopogon Root can, on the basis of nourishing yin, clear the deficiency heat of the heart and lung and relieve these symptoms.

4. Guide Herb - Anemarrhena

Anemarrhena Rhizome is also the assistant and guiding drug, bitter and sweet in flavor and cold in nature. It belongs to the lung, stomach and kidney meridians. It has the effects of clearing heat and purging fire, nourishing yin and moistening dryness. Combined with gypsum, Anemarrhena Rhizome enhances the power of clearing heat and purging fire; coordinated with prepared Rehmannia Root and Ophiopogon Root, it strengthens the effect of nourishing yin and moistening dryness. It can also guide all the drugs to reach the disease location, making the medicinal power play a better role. In Yunu Decoction, Anemarrhena Rhizome plays an important role in coordinating all the drugs and assisting in treatment, making the effect of the whole formula more perfect.

Pathogenesis, Efficacy & Indications

1. Pathogenesis Analysis

The pathogenesis targeted by Yunu Decoction is mainly excessive heat in the stomach and deficiency of kidney yin. The stomach is an organ rich in qi and blood. External pathogenic factors are likely to transform into heat and enter the stomach, or emotional disorders, overeating spicy, fatty, sweet and thick-flavored foods, etc. can all lead to the endogenous generation of stomach fire. When there is excessive stomach fire, symptoms such as high fever, thirst, gum swelling and pain, bad breath, etc. can occur. The kidney is the root of congenital constitution, and kidney yin is the fundamental of human yin fluid. If stomach fire persists for a long time, or the patient is congenitally deficient in kidney yin, it can lead to deficiency of kidney yin. When there is deficiency of kidney yin, symptoms such as soreness and weakness of the waist and knees, dizziness and tinnitus, spermatorrhea, etc. can occur.

2. Efficacy

Yunu Decoction has the effects of clearing stomach heat and nourishing kidney yin. By using drugs such as gypsum to clear heat and purge fire to remove a series of symptoms brought by stomach fire; at the same time, using nourishing yin drugs such as prepared Rehmannia Root, Ophiopogon Root, and Anemarrhena Rhizome to nourish kidney yin and supplement the deficiency of kidney yin, achieving the purpose of clearing heat and nourishing yin, treating both the symptoms and the root cause.

3. Indications

Yuning Decoction (Yùnǚ Jiān) is mainly used to treat the syndrome of stomach heat with yin deficiency. Symptoms include headache, toothache, loose teeth with bleeding gums, restlessness, dryness and thirst, red tongue with yellow and dry coating. It can also treat consumptive thirst, excessive hunger and other symptoms. Among them, headache is mostly caused by the upward flaring of stomach fire along the meridian disturbing the clear orifices; toothache, loose teeth with bleeding gums are caused by stomach fire burning the gums and blood vessels; restlessness, dryness and thirst are manifestations of excessive stomach heat burning the body fluids; red tongue with yellow and dry coating is a typical tongue manifestation of stomach heat with yin deficiency. Symptoms such as consumptive thirst, excessive hunger are also related to excessive stomach heat and insufficient yin fluid. Yuning Decoction can effectively clear stomach heat and nourish kidney yin, thus relieving these symptoms.

IV. Analysis of Yunu Decoction

1. Clear Heat & Nourish Yin

In Yuning Decoction, Gypsum Fibrosum (Shígāo) clears heat and purges fire, directly reducing stomach heat, which is a method for treating the symptoms. Rehmannia Glutinosa (Shúdì) nourishes yin and tonifies the kidney, replenishing essence and marrow, which is a strategy for treating the root cause. The combination of the two, one clearing and one tonifying, takes both the symptoms and the root cause into consideration. When stomach fire is cleared, kidney yin will not be burned; when kidney yin is tonified, it can restrict the hyperactivity of stomach fire. Ophiopogon japonicus (Màidōng) and Anemarrhena asphodeloides (Zhīmǔ) can not only assist Rehmannia Glutinosa in nourishing yin and moistening dryness, but also assist Gypsum Fibrosum in clearing heat and relieving restlessness, making the power of clearing heat and nourishing yin stronger.

2. Treat Zang-Fu Organs Simultaneously

This formula not only focuses on the two zang-organs of the stomach and the kidney. Excessive stomach heat is the symptom, and deficiency of kidney yin is the root cause. By clearing stomach heat to treat the symptom and nourishing kidney yin to treat the root cause, it achieves the effect of treating both zang-organs simultaneously. There is a close physiological connection between the stomach and the kidney. The stomach is the yang dry earth, and the kidney is the zang-organ of the shaoyin with both water and fire. Stomach heat can consume kidney yin downward, and insufficient kidney yin can also lead to the stomach losing nourishment and generating deficiency fire internally. Yuning Decoction restores the normal function of the zang-organs by adjusting the yin-yang balance between the stomach and the kidney.

3. Drug Compatibility for Synergy

The combination of Gypsum Fibrosum and Anemarrhena asphodeloides multiplies the power of clearing heat and purging fire; the synergy of Rehmannia Glutinosa, Ophiopogon japonicus and Anemarrhena asphodeloides enhances the effect of nourishing yin and moistening dryness. The drugs are mutually compatible and work together synergistically, enhancing the overall curative effect of the formula. This compatibility method reflects the delicate principle of using drugs in traditional Chinese medicine formulaology, enabling the drugs to interact with each other and jointly achieve the purpose of treating diseases.

V. Comparison with Other Similar Formulas

1. Comparison with Qingwei Powder

Qingwei Powder (Qīngwèi Sǎn)  originates from the *Treatise on the Spleen and Stomach*, and its main function is to clear stomach heat and cool the blood. Its constituent herbs include Rehmannia glutinosa, Angelica sinensis, Paeonia suffruticosa, Coptis chinensis, and Cimicifuga foetida. Qingwei San (Clear Stomach Powder) focuses on clearing stomach heat and cooling the blood, primarily used to treat toothache caused by stomach fire. In the formula, Coptis chinensis is bitter and cold, directly clearing heat from the stomach; Cimicifuga foetida clears heat and detoxifies, guiding the medicine to the Yangming meridian; Rehmannia glutinosa and Paeonia suffruticosa cool the blood and clear heat; Angelica sinensis nourishes and harmonizes the blood.

Compared to Yuning Decoction (Yùnǚ Jiān) Qingwei Powder has a stronger effect of clearing heat and cooling the blood, while its power of nourishing yin is weaker, mainly targeting symptoms such as toothache caused by excessive stomach fire and blood heat escaping recklessly.

2. Comparison with Liuwei Dihuang Pills

Liuwei Dihuang Pills It is originated from 'Key to Therapeutics of Children's Diseases' and has the effect of nourishing yin and tonifying the kidney. Its component herbs include Rehmannia glutinosa preparata, Cornus officinalis, Moutan cortex, Dioscorea opposita, Poria cocos, and Alisma orientale. Liuwei Dihuang Pills mainly nourish kidney yin and are applicable to the syndrome of deficiency of kidney yin. Compared with Yuning Decoction , Liuwei Dihuang Pills focus on nourishing kidney yin, while its heat-clearing effect is not obvious. Yuning Decoction, on the basis of nourishing kidney yin, pays more attention to clearing stomach heat and is applicable to the syndrome of stomach heat and yin deficiency.

VI. Clinical Applications and Indications

1. Oral Diseases

Yuning Decoction is often used to treat oral diseases, such as toothache, gum swelling and pain, oral ulcers caused by the upward flaring of stomach fire. For patients with severe toothache, swollen and red gums, bad breath, red tongue with yellow coating, Yuning Decoction can clear stomach fire, reduce swelling and relieve pain. In clinical practice, after many patients take Yuning Decoction, the toothache symptoms are significantly relieved and the gum swelling gradually subsides.

2. Diabetes

Consumptive thirst is similar to diabetes in modern medicine. If symptoms such as excessive hunger, polydipsia, restlessness appear, and the syndrome differentiation belongs to stomach heat and yin deficiency, Yuning Decoction can be used for treatment. In the formula, Gypsum Fibrosum and Anemarrhena asphodeloides clear stomach heat, Rehmannia glutinosa preparata, Ophiopogon japonicus, and Anemarrhena asphodeloides nourish yin and moisten dryness, which helps to relieve the symptoms of patients with consumptive thirst and regulate blood sugar levels.

3. Acne

The occurrence of acne is related to various factors, and the steaming of stomach heat is one of the common causes. For patients with red, swollen and painful facial acne accompanied by symptoms of stomach heat such as bad breath and constipation, Yuning Decoction can clear stomach heat, cool blood and detoxify, and improve acne symptoms. By adjusting the yin-yang balance in the body, the occurrence of acne can be reduced.

VII. Modifications

1. Those with severe stomach fire

The dosage of Gypsum Fibrosum and Anemarrhena asphodeloides can be increased to enhance the power of clearing heat and purging fire. The dosage of Gypsum Fibrosum can be increased to 30 - 60 grams, and the dosage of Anemarrhena asphodeloides can be increased to 12 - 15 grams to more effectively clear stomach fire and relieve symptoms such as high fever and restlessness.

2. Those with obvious kidney yin deficiency

The dosage of Rehmannia glutinosa can be appropriately increased, or herbs that nourish yin and tonify the kidney such as Lycium barbarum and Ligustrum lucidum can be added. The dosage of Rehmannia glutinosa can be increased to 24 - 30 grams, and 10 - 15 grams each of Lycium barbarum and Ligustrum lucidum can be used to further nourish the kidney yin and improve symptoms of insufficient kidney yin such as soreness and weakness of the waist and knees, dizziness and tinnitus.

3. Those with constipation

Purgative drugs such as Rheum palmatum and Natrii Sulfas can be added to purge heat from the fu-organs. Use 5 - 10 grams of Rheum palmatum and 3 - 6 grams of Natrii Sulfas, which can play the role of removing the fire from the bottom of the pot, causing the stomach fire to be purged downward and relieving the symptom of constipation.

4. Those with blood heat bleeding

Cooling and hemostatic drugs such as Rehmannia glutinosa, Paeonia lactiflora, and Moutan cortex can be added. Use 15 - 20 grams of Rehmannia glutinosa, 10 - 12 grams of Paeonia lactiflora, and 10 - 12 grams of Moutan cortex to enhance the effects of clearing heat and cooling blood and hemostasis, and treat symptoms such as gingival bleeding and epistaxis.

VIII. Dosage (Traditional and Modern Concentrated Granules)

1. Traditional method

The traditional usage of Yuping Decoction is to decoct it for oral administration. Generally, use 15 - 30 grams of Gypsum Fibrosum, 9 - 30 grams of Rehmannia glutinosa, 6 grams of Ophiopogon japonicus, 5 grams of Anemarrhena asphodeloides, and 5 grams of Achyranthes bidentata. Add appropriate amount of water to the above drugs, soak for 30 minutes, then boil with strong fire, and then change to gentle fire and decoct for 30 - 40 minutes. Take the decoction and warm it in two doses.

2. Modern concentrated granules

With the development of modern pharmaceutical technology, Yuping Decoction also has a modern concentrated granule dosage form. When using it, just take it according to the dosage in the instruction manual. Generally speaking, taking the concentrated granules is more convenient and faster, and the curative effect is equivalent to that of the traditional decoction. For example, for a certain brand of Yuping Decoction concentrated granules, the single-dose amount is equivalent to the dosage of the crude drug, twice a day, and take it with boiling water.

IX. Precautions and Taboos

1. Use with caution for weak spleen-stomach

Yuping Decoction has a cold nature. Those with deficiency-cold of the spleen and stomach may have their spleen and stomach burden aggravated after taking it, resulting in symptoms such as abdominal pain and diarrhea. Such patients should use it with caution. If necessary, it should be used under the guidance of a doctor, and the drug dosage and compatibility should be adjusted appropriately.

2. Use with caution during pregnancy

Most of the drugs in the formula are cold and yin-nourishing herbs. Pregnant women have a special constitution, and taking it may have an adverse impact on the fetus. Therefore, if pregnant women need to use Yuping Decoction, they must be strictly evaluated and guided by a doctor.

3. Dietary taboos

During the period of taking Yuping Decoction, spicy, greasy, and stimulating foods should be avoided to prevent aggravating the symptoms of stomach heat. At the same time, the diet should be kept light, and eat more vegetables and fruits, which is helpful for the recovery of the disease.

X. Modern research progress

1. Research on pharmacological effects

In Yunu Decoction, Gypsum Fibrosum is pungent, sweet and extremely cold to clear the stomach fire, and Anemarrhena Rhizome is bitter, cold and moist in nature to nourish the deficiency of kidney yin. The combination of these two herbs clears heat and nourishes yin, and is applicable to syndromes of excessive stomach fire and deficiency of kidney yin such as restlessness, thirst, headache, toothache and stopping the bleeding of upward overflow. Modern research shows that Gypsum Fibrosum in Yunu Decoction has effects such as antipyretic and anti-inflammatory; Rehmannia Glutinosa has effects such as nourishing yin and blood, regulating immunity, etc.; Ophiopogon Japonicus can improve the body's hypoxia tolerance and myocardial function; Anemarrhena Rhizome has effects such as anti-inflammatory, antibacterial and hypoglycemic. These pharmacological effects provide a scientific basis for the clinical application of Yunu Decoction and further confirm its effectiveness in treating syndromes of stomach heat and yin deficiency.

2. Observation of clinical efficacy

Many clinical studies have observed the curative effects of Yunu Decoction in the treatment of various diseases. For example, when treating diabetes with syndromes of stomach heat and yin deficiency, Yunu Decoction can significantly reduce the fasting blood glucose and postprandial blood glucose levels of patients and improve the clinical symptoms. In the treatment of oral diseases, Yunu Decoction also shows good anti-inflammatory and analgesic effects, can promote the healing of oral ulcers and relieve the symptoms of gingival swelling and pain.

3. Research on dosage form improvement

With the development of modern technology, the research on the dosage form improvement of Yunu Decoction is also continuously carried out. In addition to the modern concentrated granule dosage form, some people also study to make it into dosage forms such as capsules and dripping pills to improve the stability of the drug and the convenience of taking. These research on dosage form improvement helps to better exert the curative effect of Yunu Decoction and meet the needs of clinical practice and patients.

As a classic prescription in traditional Chinese medicine, Yunu Decoction has withstood the test of hundreds of years of clinical practice, has unique curative effects and rich connotations. By deeply understanding its origin, composition, pathogenesis, efficacy, application, etc., we can better master this prescription and provide strong support for clinical treatment. At the same time, the continuous progress of modern research also opens up a broad prospect for the further development and application of Yunu Decoction.