1. Source and History of Yinqiao Powder

1. Birth Background of Yinqiao Powder

Yin Qiao San (银翘散), known in English as Honeysuckle and Forsythia Powder, is one of the most important classical formulas in Traditional Chinese Medicine for treating Wind-Heat invasion at the very early (Wei) stage of febrile diseases. Yinqiao Powder was first recorded in 'Treatise on Febrile Diseases' written by Wu Jutong, a famous febrile disease expert in the Qing Dynasty. During that period, febrile diseases raged, and traditional treatment methods often failed to achieve satisfactory results. Based on his long-term clinical practice and in-depth research on febrile diseases, Wu Jutong summarized the experience of predecessors and created Yinqiao Powder, opening up a new way for the treatment of febrile diseases.

2. Historical Evolution and Inheritance

Created by Wu Ju-tong in the Qing dynasty, this elegant formula clears Heat, relieves toxicity, and disperses Wind from the exterior before the pathogen penetrates deeper into the body. It is particularly indicated for the onset of colds and flu with Heat signs such as fever with slight aversion to wind, sore throat, thirst, red tongue tip, and floating rapid pulse. In modern clinical practice, Yin Qiao San is widely used at the first signs of Wind-Heat type upper respiratory infections, often within the first 24–48 hours, to gently clear the pathogen while protecting the body’s righteous Qi.

Since its appearance, Yinqiao Powder has been widely used in the clinical treatment of the initial stage of febrile diseases. Later generations of physicians have continuously summarized and improved it during the application process, making its curative effect in treating febrile diseases more remarkable. It has not only spread in China but also had a certain impact on the development of medicine in neighboring countries, becoming one of the classic prescriptions for treating febrile diseases in traditional Chinese medicine and has been passed down for hundreds of years.

2. Introduction of Ingredients (King, Minister, Assistant, Guide)

1. King Ingredients: Honeysuckle, Forsythia

- Flos Lonicerae

Flos Lonicerae is sweet in flavor and cold in nature, with the effects of clearing heat and detoxifying, dispelling wind and heat. It is good at clearing the heat-toxin in the upper-jiao lung meridian and has a good curative effect on the symptoms such as fever and sore throat at the initial stage of febrile diseases when the pathogenic factors are in the lung and defensive qi. Its power of clearing heat and detoxifying is relatively strong, and the effect of dispelling wind and heat is stable, making it an important herb for treating febrile diseases.

- Fructus Forsythiae

Fructus Forsythiae is bitter and slightly cold in nature, belonging to the lung, heart, and small intestine meridians. It can clear heat and detoxify, eliminate swelling and dissipate nodules, and dispel wind and heat. It is used in combination with Flos Lonicerae, enhancing the effects of clearing heat and detoxifying, dispelling wind and heat. Fructus Forsythiae can also penetrate heat and transform qi, enabling the pathogenic heat in the defensive qi to quickly penetrate into the qi aspect, preventing the further development of the disease.

2. Minister Ingredients: Mint, Arctium, Schizonepeta, Sojae Semen Praeparatum

- Herba Menthae

Herba Menthae is pungent in flavor and cool in nature, belonging to the lung and liver meridians. It has the functions of dispelling wind and heat, clearing the head and eyes, relieving sore throat and promoting eruption, and soothing the liver and regulating qi. In Yinqiao Powder, Herba Menthae can assist the monarch herb in dispelling wind and heat in the upper-jiao, enabling the pathogenic wind and heat to be resolved from the exterior, and at the same time can relieve symptoms such as headache and sore throat.

- Arctium lappa

Arctium lappa is pungent, bitter and cold in nature, and belongs to the lung and stomach meridians. It can disperse wind-heat, promote the dispersing of the lung qi and resolving phlegm, relieve sore throat and promote eruption, and detoxify and reduce swelling. It can enhance the power of dispersing wind-heat, and can clear and benefit the throat, which is particularly suitable for those with sore throat at the initial stage of warm diseases.

- Schizonepeta tenuifolia Briq.

Schizonepeta tenuifolia Briq. is pungent in taste and slightly warm in nature, and belongs to the lung and liver meridians. It has the effects of inducing sweating to disperse wind, promoting eruption and resolving carbuncles. Its pungent-dispersing power is relatively strong, which can assist the monarch drug to disperse wind-heat on the body surface. After Schizonepeta tenuifolia Briq. is stir-fried into charcoal, it also has the effect of stopping bleeding, preventing bleeding syndromes caused by heat injuring blood collaterals during the process of warm diseases.

- Semen Sojae Preparatum

Semen Sojae Preparatum is bitter, pungent and cool in nature, and belongs to the lung and stomach meridians. It can induce sweating, relieve vexation, and disperse stagnated heat. It can not only assist in dispersing wind-heat, but also disperse stagnated heat, allowing pathogenic heat to have an outlet. It has a good therapeutic effect on symptoms such as fever, slightly aversion to wind-cold, and restlessness caused by stagnation of pathogenic factors in the muscle surface at the initial stage of warm diseases.

3. Assistant Ingredients: Bambusa Leaves, Phragmites Rhizome

- Phyllostachys nigra (Lodd.) Munro var. henonis (Mitf.) Stapf ex Rendle

Phyllostachys nigra (Lodd.) Munro var. henonis (Mitf.) Stapf ex Rendle is sweet, pungent, light in taste and cold in nature, and belongs to the heart, stomach and small intestine meridians. It can clear away heat and relieve vexation, promote the production of body fluid and induce diuresis. In Yinqiao Powder, Phyllostachys nigra (Lodd.) Munro var. henonis (Mitf.) Stapf ex Rendle can clear the heat in the upper jiao, relieve symptoms such as fever and restlessness. At the same time, its diuretic effect helps the pathogenic damp-heat to be excreted through urine.

- Rhizoma Phragmitis

Rhizoma Phragmitis is sweet in taste, cold in nature, and attributed to the lung and stomach meridians. It has the effects of clearing heat and purging fire, promoting the production of body fluid to quench thirst, removing vexation, stopping vomiting, and inducing diuresis. It can clear heat and promote the production of body fluid, and has a good relieving effect on symptoms such as thirst and dry throat caused by the injury of body fluid at the initial stage of febrile disease. Moreover, it can harmonize the stomach and stop vomiting, enabling the stomach qi to descend smoothly.

4. Guide Ingredients: Platycodon, Licorice

- Platycodon Grandiflorum

Platycodon Grandiflorum is bitter and pungent in taste, neutral in nature, and attributed to the lung meridian. It can disperse the lung qi, resolve phlegm, soothe the throat, and drain pus. It can carry the drugs upward, enabling the medicinal power to reach the affected area directly. At the same time, it can promote the smooth flow of lung qi and has an adjuvant therapeutic effect on symptoms such as cough due to the failure of lung qi dispersion at the initial stage of febrile disease treated with Yinqiao Powder.

- Glycyrrhiza Glabra

Glycyrrhiza Glabra is sweet in taste, neutral in nature, and attributed 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 coordinating the properties of various drugs. In Yinqiao Powder, Glycyrrhiza Glabra can not only coordinate the properties of various drugs, enabling each drug to exert its effects synergistically, but also moisten the lung and relieve cough, alleviating cough symptoms. It can also moderate the drastic nature of the drugs in the formula.

Pathogenesis, Effects & Indications of Yinqiao Powder

1. Pathogenesis Analysis

The disease treated by Yinqiao Powder has a pathogenesis of the initial stage of febrile disease with the pathogenic factor residing in the lung and defensive qi. The warm-heat pathogenic factor invades the human body and first attacks the lung, leading to the disorder of the functions of the lung and defensive qi. The lung is in charge of qi and respiration, externally associated with the skin and hair, and opens into the nose. Therefore, when the warm pathogen attacks the lung, the defensive qi is stagnated, and the opening and closing functions are disordered, presenting exterior syndrome such as fever and slight aversion to wind-cold; when the lung fails to disperse and descend properly, the lung qi rebels upward, resulting in cough; when the warm-heat pathogenic factor disturbs the throat, there will be sore throat.

2. Effects

Yinqiao Powder has the effects of dispersing pathogenic factors on the exterior with pungent and cool herbs and clearing heat and detoxifying. In the formula, Flos Lonicerae Japonicae and Fructus Forsythiae are used as the monarch drugs to clear heat and detoxify and disperse wind-heat; Mentha Haplocalyx, Arctium Lappa, Herba Schizonepetae, and Semen Sojae Praeparatum assist the monarch drugs to disperse wind-heat and strengthen the power of relieving the exterior syndrome as the ministerial drugs; Folium Bambusae and Rhizoma Phragmitis clear heat and promote the production of body fluid as the adjuvant drugs; Platycodon Grandiflorum carries the drugs upward, and Glycyrrhiza Glabra coordinates the properties of various drugs as the envoy drugs. With the compatibility of the whole formula, it jointly achieves the effects of dispersing pathogenic factors on the exterior with pungent and cool herbs and clearing heat and detoxifying, enabling the pathogenic heat on the exterior to be dispersed and the heat-toxin in the interior to be cleared.

3. Indications

Yinqiao Powder is mainly used for the initial stage of warm diseases. Symptoms include fever, mild aversion to wind-cold, no sweating or unsmooth sweating, headache, thirst, sore throat, cough, red tip and edges of the tongue, thin white or slightly yellowish tongue coating, and floating and rapid pulse. Clinically, it is often used to treat colds, influenza, acute tonsillitis, acute pharyngitis, etc. belonging to the initial stage of warm diseases with pathogenic factors in the lung and defensive qi.

Analysis of Yinqiao Powder Formula

1. Combine Exterior & Heat Clearing

In Yinqiao Powder, there are heat-clearing and detoxifying herbs such as Flos Lonicerae Japonicae and Fructus Forsythiae, as well as herbs for dispersing wind-heat such as Herba Menthae Haplocalycis and Spica Schizonepetae, which reflects the characteristic of using both exterior-resolving and heat-clearing methods simultaneously. In the initial stage of warm diseases, when pathogenic factors are in the lung and defensive qi, simply resolving the exterior is difficult to clear the interior heat, and simply clearing heat may fear cold pathogen stagnating the exterior pathogen. Therefore, the treatment method of combining exterior-resolving and heat-clearing is adopted, so that the exterior pathogen can be resolved and the interior heat can be cleared, achieving the purpose of resolving both the exterior and the interior.

2. Method of Gentle & Clear Discharge

Most of the herbs in the formula are light and clear in nature, such as Herba Menthae Haplocalycis, Fructus Arctii, Spica Schizonepetae, Semen Sojae Praeparatum, etc., which have the property of light and clear dispersion. These herbs can quickly penetrate the muscle surface and disperse wind-heat pathogens, allowing the pathogens to find an outlet and preventing the inward transmission of pathogenic heat. At the same time, heat-clearing and detoxifying herbs such as Flos Lonicerae Japonicae and Fructus Forsythiae are not used in large doses of bitter-cold herbs to directly reduce the heat, but are used in a light and clear way to disperse and clear the heat in the lung and defensive qi, conforming to the principle of 'In the defensive qi, sweating is sufficient; when it reaches the qi aspect, only then can the qi be cleared' in the treatment of the initial stage of warm diseases.

3. Marvel of Lung-ventilating & Cough-suppressing

Platycodon grandiflorum promotes the dispersing function of the lung and relieves cough, and Glycyrrhiza uralensis moistens the lung and relieves cough. The combination of the two can relieve cough symptoms. At the same time, Fructus Arctii and Platycodon grandiflorum can also benefit the throat, and Folium Bambusae in Taenia and Rhizoma Phragmitis can clear heat and promote fluid production, relieving symptoms such as sore throat and dry throat with thirst. The application of these herbs plays a comprehensive therapeutic role of promoting the dispersing function of the lung, relieving cough, benefiting the throat and detoxifying, clearing heat and promoting fluid production for the symptoms of the lung and defensive qi in the initial stage of warm diseases, enabling the functions of the lung and defensive qi to return to normal.

V. Comparison with Other Similar Prescriptions

1. Comparison with Sangju Decoction

- Similarities

Mulberry Leaf and Chrysanthemum Decoction and Yinqiao Powder can both be used to treat the initial stage of warm diseases. Both have the effect of dispersing wind-heat and can relieve cough symptoms.

- Differences

The efficacy of Sangju Decoction focuses on dispelling wind and clearing heat, and dispersing the lung qi to arrest cough. It is mainly used for the initial stage of wind-warm disorders, with pathogenic factors lodging in the lung collaterals syndrome. Symptoms include cough, mild body fever, slightly thirsty mouth, and floating and rapid pulse. In the formula, mulberry leaf and chrysanthemum are used as the monarch drugs, focusing on clearing and purging the lung heat, and being combined with bitter almond, platycodon root and other herbs for dispersing the lung qi to arrest cough. The medicinal flavors are relatively mild, gentle and peaceful. Yinqiao Powder Its efficacy is to dispel pathogenic factors on the exterior with pungent and cool herbs, clear heat and resolve toxins, and is mainly used to treat the initial stage of warm diseases, with pathogenic factors in the lung and defensive qi, and relatively severe exterior heat syndrome. Symptoms include relatively severe fever, slightly aversion to wind-cold, sore throat and thirst. In the formula, the dosages of honeysuckle flower and forsythia fruit are relatively large, with a stronger power of clearing heat and resolving toxins, and being combined with many exterior-resolving herbs, the exterior-resolving effect is more remarkable.

2. Comparison with Maxing Shigan Decoction

- Similarities

Maxing Shigan Decoction and Yinqiao Powder can both be used to treat symptoms such as fever and cough.

- Differences

Maxing Shigan Decoction is mainly used to treat exterior contraction of wind pathogen, with pathogenic heat congesting the lung syndrome. Symptoms include persistent body fever, sweating or no sweating, cough with dyspnea, even nasal flaring, thirst, thin white or yellow tongue coating, and floating and rapid pulse. In the formula, ephedra and gypsum are combined, focusing on clearing and purging the lung heat, and also relieving the exterior, being applicable to the excess syndrome of lung heat congestion. Yinqiao Powder It is mainly used to treat the initial stage of warm diseases, where pathogenic factors are in the lung and defensive qi, with exterior heat being the main manifestation and not yet transforming into interior heat. The formula mainly consists of herbs that clear heat and detoxify, disperse wind-heat, focusing on dispersing the exterior and clearing heat, enabling the pathogenic factors to be resolved from the exterior. It is applicable to the relatively mild cases in the initial stage of warm diseases.

VI. Clinical Applications and Indications

1. Common Cold

Common cold is a frequently encountered exterior contraction disease in clinical practice. If it presents symptoms such as fever, slight aversion to wind-cold, headache, sore throat, red tip and edges of the tongue, thin white or slightly yellowish tongue coating, and floating and rapid pulse, and is differentiated as the initial stage of warm disease with pathogenic factors in the lung and defensive qi, Yinqiao Powder can be selected for treatment. Generally, after taking Yinqiao Powder, symptoms such as fever and aversion to cold can gradually relieve, and the condition can be controlled.

2. Influenza

During the influenza epidemic season, if there are symptoms such as relatively high fever, slight aversion to cold, headache, general body aches, sore throat, cough, etc., which conform to the pathogenesis of the initial stage of warm disease with pathogenic factors in the lung and defensive qi, Yinqiao Powder can be used as a commonly used formula. It can effectively relieve influenza symptoms, shorten the course of disease, and reduce the occurrence of complications.

3. Acute Tonsillitis

Acute tonsillitis is mostly caused by exogenous wind-heat pathogens. Common symptoms include sore throat, difficulty in swallowing, fever, and slight aversion to wind-cold. Yinqiao Powder has the effects of clearing heat and detoxifying, relieving sore throat and reducing swelling. It has good curative effects on acute tonsillitis belonging to the initial stage of warm disease with pathogenic factors in the lung and defensive qi, and can relieve symptoms such as sore throat and make the inflammation subside.

4. Acute Pharyngitis

Patients with acute pharyngitis often present symptoms such as redness, swelling, pain, dryness, burning sensation in the pharynx, difficulty in swallowing, accompanied by fever, aversion to cold, etc. Yinqiao Powder can disperse wind-heat, clear heat and detoxify, relieve sore throat and pain, improve the symptoms of acute pharyngitis, and promote the recovery of pharyngeal inflammation.

7. Additive and Subtractive Changes

1. With Dampness Evil

If damp pathogens are also involved, Herba Pogostemonis, Herba Eupatorii, Talcum, etc. can be added to aromatically transform dampness and promote its excretion through light diuresis. Herba Pogostemonis and Herba Eupatorii can aromatically transform dampness, dispel foulness and harmonize the middle jiao, enabling the damp pathogens to be transformed and dispersed; Talcum can clear heat and promote diuresis, enabling the damp pathogens to be excreted through urine. When combined with the original formula, it can enhance the power of eliminating dampness and treat the syndrome of the initial stage of warm disease with concurrent damp pathogens.

Those with severe cough

For severe cough, Semen Armeniacae Amarum and Radix Peucedani can be added to enhance the effects of relieving cough and resolving phlegm. Semen Armeniacae Amarum can lower qi and relieve cough and asthma, and Radix Peucedani can lower qi and resolve phlegm. When combined with Platycodon grandiflorum and Glycyrrhiza glabra, it can enhance the function of dispersing lung qi and relieving cough, and relieve cough symptoms.

For Those with Severe Heat Toxin

For those with severe heat-toxin, heat-clearing and toxin-resolving herbs such as Taraxacum mongolicum, Viola yedoensis, and Chrysanthemum indicum can be added to enhance the power of clearing heat and resolving toxins, so as to better treat the syndrome of excessive heat-toxin at the initial stage of warm diseases. These herbs can further clear the heat-toxin in the lung and defensive qi, effectively controlling the disease condition.

VIII. Dosage (Traditional & Modern)

1. Traditional Methods

The traditional usage of Yinqiao Powder is 'pestle into powder, take six qian each time, decoct with fresh reed root decoction. When the aroma is strong, take it immediately without overcooking. Lung herbs are taken for their light and clear nature. Overcooking will make the flavor thick and enter the middle jiao. For those with severe illness, take it once every two hours, three times a day and once at night; for those with mild illness, take it once every three hours, twice a day and once at night; if the disease does not resolve, take another dose.' That is to grind the herbs into powder, take six qian each time, and decoct with fresh reed root decoction. Pay attention to the heat when decocting. Take it when the aroma is strong and do not overcook. For those with severe illness, take it every two hours, three times a day and once at night; for those with mild illness, take it every three hours, twice a day and once at night; if the condition does not improve, take another dose.

2. Modern Concentrated Granules

The usual dosage of modern concentrated granules of Yinqiao Powder is to be taken by pouring boiling water, one bag each time, three times a day. The concentrated granules are extracted and concentrated by modern technology based on the traditional formula. They are convenient to take and carry, and can better retain the active ingredients of the herbs, with the curative effect equivalent to that of the traditional decoction.

IX. Precautions and Taboos

1. Dietary Taboos

During the period of taking Yinqiao Powder, spicy, greasy, and stimulating foods such as chili peppers, fried foods, strong tea, and coffee should be avoided. These foods may aggravate the heat pathogen in the body, affect the curative effect of the herbs, and are not conducive to the recovery of the disease condition.

2. Special Populations

Pregnant women, lactating women, children, the elderly, and those with weak constitutions should be cautious when using Yinqiao Powder. If it is necessary to use, it should be carried out under the guidance of a doctor, and the dosage and medication time should be adjusted according to individual conditions to ensure the safety of medication.

3. Condition Observation

After taking the medicine, closely observe the changes in the disease condition, such as whether symptoms like fever, aversion to cold, sore throat, cough, etc. are relieved. If the symptoms persist or worsen, seek medical attention in a timely manner and adjust the treatment plan to avoid delaying the disease condition.

Tenth. Modern Research Progress

1. Pharmacological Research

Yinqiao Powder is a commonly used formula for treating wind-heat colds and has good effects on upper respiratory tract infection symptoms such as cough with sore throat and pneumonia. It has the functions of relieving exterior syndrome with pungent-cool herbs and clearing heat and resolving toxins.

Modern research shows that Yinqiao Powder has effects such as antiviral, antibacterial, anti-inflammatory, and antipyretic. The active ingredients in herbs such as Flos Lonicerae and Fructus Forsythiae can inhibit the growth and reproduction of various viruses and bacteria, reduce the inflammatory response, and lower body temperature. Its anti-inflammatory effect may be related to regulating the body's immune function, enhancing the body's resistance, and resisting the invasion of exogenous pathogens.

2. Clinical Efficacy Observation

A large number of clinical studies have confirmed that Yinqiao Powder has significant curative effects in the treatment of diseases such as colds, influenza, acute tonsillitis, acute pharyngitis, etc. Compared with Western medicine, Yinqiao Powder has fewer side effects, higher safety, and can effectively relieve symptoms and shorten the course of disease. In the prevention and treatment of some epidemic diseases, Yinqiao Powder has also played an important role, demonstrating the unique advantages of traditional Chinese medicine prescriptions in modern medicine.

3. Dosage Form Improvement Research

In order to improve the convenience and stability of taking Yinqiao Powder, scientific research personnel have improved its dosage form. In addition to modern concentrated granules, new dosage forms such as Yinqiao Powder capsules and Yinqiao Powder dripping pills have also been developed. While retaining the curative effects of the medicine, these new dosage forms are more convenient for patients to take and store, further promoting the clinical application and popularization of Yinqiao Powder.