1. Source and History of Formulas

1. Birth Background of Zhisou San

Zhi Sou San is a commonly used formula for treating exogenous coughs. It has the functions of dispersing the exterior, ventilating the lungs, relieving cough and resolving phlegm, eliminating phlegm, descending qi to resolve phlegm, not damaging healthy qi when relieving the exterior, not assisting heat when dispelling cold, and being gentle, warm and harmonious. It is mainly used for coughs caused by initial exposure to wind-cold, wind pathogen invading the lungs, and failure of the lung qi to disperse, with symptoms such as cough, itchy throat when coughing, cough with qi surging upward, thin and white tongue coating, and floating and slow pulse. It is widely used clinically for upper respiratory tract infections, bronchitis, pertussis, lung-heat cough, wind-heat cough, etc. Use with caution in cases of blood-streaked sputum, and it also has an adjuvant effect on yin-deficiency cough due to overstrain. It is composed of Platycodon grandiflorum, Aster tataricus, Schizonepeta tenuifolia, Glycyrrhiza uralensis, Citrus reticulata Blanco, Stemona japonica, etc., which can resolve phlegm and relieve thirst. Syndrome differentiation is required during clinical application.

Zhi Sou San was first recorded in Yìxué Xīnwù written by Cheng Zhongling in the Qing Dynasty. Cheng Zhongling was a doctor with profound insights and rich experience in traditional Chinese medicine clinical practice. In the medical practice at that time, cough was an extremely common disease. Although there were many formulas for treating cough, there were still some unsatisfactory therapeutic effects. Cheng Zhongling, through long-term clinical practice and summarization and refinement of the experience of predecessors, carefully created the Zhi Sou San formula, aiming to provide a more effective solution for the treatment of cough.

2. Historical Inheritance and Influence

Since its appearance, Zhi Sou San has been widely applied and inherited in traditional Chinese medicine clinical practice. It has been highly praised by doctors of all dynasties for its exquisite formula and definite curative effect. Many traditional Chinese medicine works have included and expounded on it, enabling this formula to be continuously spread and developed. In different historical periods, Zhi Sou San has played an important role, relieving the pain of countless cough patients and becoming one of the classic formulas for treating cough in traditional Chinese medicine, having a profound impact on the theory and practice of treating cough in later generations of traditional Chinese medicine.

Zhi Sou San is one of the most frequently used Traditional Chinese Medicine formulas for managing persistent cough and supporting respiratory recovery. Traditionally prescribed to dispel external pathogens, regulate Lung qi, and stop coughing, Zhi Sou San benefits individuals experiencing lingering cough, throat irritation, and respiratory discomfort following common colds or viral illnesses. As a classic Zhi Sou San TCM formula, it is widely utilized within Traditional Chinese Medicine for cough and may be considered for post-viral cough recovery, chronic cough TCM treatment, and Chinese herbs for respiratory health. Modern practitioners frequently apply the formula when symptoms align with a Wind invasion affecting the Lungs, particularly in cases involving lingering cough after infection, dry cough Chinese medicine, and throat irritation TCM. Because effective treatment depends on accurate pattern differentiation, consultation with a qualified TCM practitioner is recommended to determine whether Zhi Sou San is appropriate for your specific condition.

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

1. King Herbs - Aster, Stemona

Aster tataricus is sweet, bitter, and warm in nature, and belongs to the lung meridian. It has the effects of moistening the lungs and lowering qi, resolving phlegm and relieving cough. Aster tataricus can disperse the stagnation of the lung qi and resolve phlegm and relieve cough, and can be applied to various coughs, regardless of whether they are new or old, deficiency or excess. Stemona japonica is sweet, bitter, and slightly warm in nature, and belongs to the lung meridian. Its main effects are moistening the lungs and lowering qi to relieve cough, killing insects and lice. Stemona japonica is good at treating dryness-heat cough in the lungs, consumptive cough, etc., and is particularly suitable for coughs accompanied by symptoms of yin deficiency in the lungs such as dry throat and mouth. As the monarch drugs, Aster tataricus and Stemona japonica together play a core role in moistening the lungs and relieving cough, and treat the main pathogenesis of cough.

2. Minister Herbs - Platycodon, Cynanchum

Platycodon grandiflorum is bitter, pungent, and neutral in nature, and belongs to the lung meridian. It can ventilate the lungs, resolve phlegm, benefit the throat and drain pus. Platycodon grandiflorum can ventilate the lung qi, make the lung qi smooth, and help the discharge of phlegm, and has a good therapeutic effect on coughs accompanied by unsmooth expectoration. Cynanchum glaucescens is pungent, bitter, and slightly warm in nature, and belongs to the lung meridian. Its effect is to lower qi and resolve phlegm, and is mainly used for syndromes of excessive lung qi and excessive cough with profuse phlegm. Platycodon grandiflorum promotes the upward movement of lung qi, while Cynanchum glaucescens lowers qi and resolves phlegm. The two work together, one ascending and one descending, to regulate the ascending, descending, entering and exiting of lung qi, enhance the effect of relieving cough and resolving phlegm, and assist the monarch drugs to better exert the therapeutic effect.

3. Assistant Herbs - Schizonepeta, Tangerine Peel

Schizonepeta tenuifolia is pungent in flavor and slightly warm in nature, and belongs to the lung and liver meridians. It has the effects of expelling wind and relieving the exterior, promoting eruption and treating sores. In Zhi Sou San, Schizonepeta tenuifolia mainly plays the role of dispersing wind pathogens. Because wind pathogen is one of the common inducing factors for cough, Schizonepeta tenuifolia can disperse the wind pathogen on the exterior, so that the wind pathogen is removed and the cough is relieved. Citrus reticulata Blanco is pungent, bitter, and warm in nature, and belongs to the spleen and lung meridians. It has the effects of regulating qi and strengthening the spleen, drying dampness and resolving phlegm. Citrus reticulata Blanco can regulate the qi of the spleen and stomach, prevent the spleen and stomach from losing normal transportation and transformation and generating phlegm, and at the same time assist in resolving phlegm and relieving cough. As the assistant drugs, Schizonepeta tenuifolia and Citrus reticulata Blanco assist the monarch and ministerial drugs to play their roles from different angles and jointly deal with the etiology and pathogenesis of cough.

4. Guide Herb - Licorice Root

Glycyrrhiza uralensis is sweet in flavor and neutral in nature, and belongs to the heart, lung, spleen, and stomach meridians. It has multiple effects such as invigorating the spleen and replenishing qi, moistening the lungs and relieving cough, clearing heat and detoxifying, and harmonizing all the drugs in a formula. In Zhi Sou San, on the one hand, Glycyrrhiza uralensis can moisten the lungs and relieve cough, enhancing the effects of cough-relieving drugs such as Aster tataricus and Stemona japonica; on the other hand, it can harmonize all the drugs in a formula, making the various drugs in the formula cooperate with each other and exert the best therapeutic effect. The presence of Glycyrrhiza uralensis makes the property of the whole formula more gentle and the action more coordinated.

III. Pathogenesis, Efficacy & Indications

1. Pathogenesis Analysis

The occurrence of cough is mostly caused by exogenous pathogenic factors invading the lung system, or the dysfunction of zang-fu organs, which internally injures the lungs, resulting in the failure of the lungs to disperse and descend, and the upward reversal of lung qi. Wind pathogen is a relatively common etiology in exogenous cough. Wind pathogen often combines with cold, heat, dryness and other pathogenic factors to invade the human body, causing disharmony of the lung defense and stagnation of lung qi, and then presenting cough symptoms. Endogenous cough is mostly caused by the dysfunction of zang-fu organs, such as lung deficiency, spleen deficiency, kidney deficiency, etc., resulting in the failure of the lungs to be nourished and the loss of power in descending and purging, thus developing into cough. The pathogenesis targeted by Zhi Sou San is mainly exogenous wind pathogen invading the lungs, the failure of the lungs to disperse and descend, and the upward reversal of lung qi. At the same time, it takes into account the functional state of the lungs itself to achieve the purpose of relieving cough.

2. Efficacy Explanation

The main effects of Zhisou San are to relieve cough and resolve phlegm, disperse wind and diffuse the lung qi. In the formula, Aster tataricus and Stemona japonica moisten the lung and relieve cough, Platycodon grandiflorum and Cynanchum glaucescens regulate the ascending and descending of lung qi to resolve phlegm, Schizonepeta tenuifolia dispels wind pathogen, Citrus reticulatae Pericarpium regulates qi and resolves phlegm, and Glycyrrhiza uralensis调和 all the herbs and moistens the lung to relieve cough. When all the herbs are used together, it can effectively relieve cough and resolve phlegm, and disperse wind pathogen, enabling the lung qi to be diffused and the cough to stop automatically.

3. Indicated Diseases

Zhisou San is mainly used to treat cough caused by wind pathogen invading the lung. The symptoms include itchy throat with cough, unsmooth expectoration, or slightly aversion to wind and fever, thin and white tongue coating, and floating and slow pulse. This kind of cough often has a relatively sudden onset and is usually accompanied by mild exogenous symptoms such as aversion to wind and fever at the beginning. As the disease progresses, the cough gradually worsens, the throat itching becomes obvious, and expectoration is not smooth. Whether it is a newly contracted cough or a chronic cough with residual wind pathogen, Zhisou San has good curative effects.

IV. Analysis of Formula Principles

1. Wonderful in Relieving Cough & Phlegm

Aster tataricus and Stemona japonica moisten the lung and relieve cough, which are key herbs for treating cough. Platycodon grandiflorum and Cynanchum glaucescens, one ascending and one descending, regulate the lung qi, making the lung qi smooth and enabling the phlegm to be discharged smoothly, enhancing the effect of resolving phlegm and relieving cough. Citrus reticulatae Pericarpium dries dampness and resolves phlegm, assisting other herbs in resolving phlegm. Glycyrrhiza uralensis moistens the lung and relieves cough,调和 all the herbs, making the effect of relieving cough and resolving phlegm of the whole formula more coordinated and orderly.

2. Method of Dispersing Wind & Ventilating Lung

Schizonepeta tenuifolia has the effect of dispelling wind pathogen and can treat the cause of wind pathogen invading the lung. Once the wind pathogen is removed, the lung defense is harmonized, the lung qi is diffused, and the cough symptoms will naturally be alleviated. Platycodon grandiflorum diffuses the lung qi, which helps to disperse the wind pathogen and also enables the lung qi to restore its normal diffusing function.

3. Precision of Overall Compatibility

止嗽散配伍之精妙在于君、臣、佐、使各药分工明确，协同合作。君药紫菀、百部重在止咳；臣药桔梗、白前调理肺气以助化痰；佐药荆芥祛风邪，陈皮理气化痰；使药甘草调和诸药，润肺止咳。全方用药轻清，不寒不热，不峻不猛。既能祛邪，又可扶正，体现了中医治病求本、标本兼治的原则。

V. Comparison with Other Similar Formulas

1. Comparison with San'ao Decoction

Sanao Decoction is composed of Ephedra sinica, Armeniaca vulgaris, and Glycyrrhiza uralensis. Its main effect is to diffuse the lung, dispel cold, and relieve cough. Its medicinal power is relatively strong and focuses on treating cough due to wind-cold binding the lung, mainly manifested by symptoms such as aversion to cold and fever, cough, and asthma. Zhisou San While relieving cough, it pays more attention to diffusing wind and the lung, and its medicinal property is mild. It is applicable to various coughs caused by wind pathogen invading the lung, and the symptoms are relatively mild, such as itchy throat with cough, unsmooth expectoration, etc.

2. Comparison with Sangju Decoction

Mulberry and Chrysanthemum Beverage It is composed of mulberry leaves, chrysanthemums, almonds, forsythia, mint, platycodon grandiflorum, licorice root, and reed rhizome, and has the effects of dispersing wind and clearing heat, and regulating the lung to arrest cough. It is mainly used for the initial stage of wind-warm syndrome with mild exterior heat pattern, manifested mainly by fever, slightly aversion to wind-cold, cough, etc. Cough-Stopping Powder Although it can also be used for externally contracted cough, it emphasizes more on the dispersion of wind pathogen and the treatment of cough. The exterior heat symptoms are not as obvious as those of Mulberry and Chrysanthemum Beverage, and it has its unique advantages in stopping cough and resolving phlegm.

VI. Clinical Applications and Indications

1. Post - cold Cough

Post-cold cough is a common disease clinically, mostly caused by the lingering of pathogenic factors after a cold and wind pathogen invading the lung. Patients often present with itchy throat and cough, unsmooth expectoration, and may be accompanied by mild nasal congestion, runny nose and other symptoms. The effects of Cough-Stopping Powder in dispersing wind, regulating the lung, stopping cough and resolving phlegm are just suitable for this kind of disease, and can effectively relieve cough symptoms and promote the recovery of the disease.

2. Chronic Bronchitis

In the remission or attack stage of patients with chronic bronchitis, if they present with symptoms such as itchy throat and cough, unsmooth expectoration, and are differentiated as wind pathogen invading the lung, Cough-Stopping Powder can also be applied for treatment. Cough-Stopping Powder can regulate the function of the lung, enhance the body resistance, reduce the attack frequency of chronic bronchitis, and improve symptoms such as cough.

3. Allergic Cough

Patients with allergic cough mostly present with itchy throat and cough, and the cough worsens after exposure to irritating odors or allergens. Wind pathogen plays an important role in the pathogenesis of allergic cough. The effect of Cough-Stopping Powder in dispersing wind and regulating the lung can reduce the stimulation of wind pathogen to the lung, thus relieving cough symptoms, and has a certain therapeutic effect on allergic cough.

VII. Modifications

1. Wind-Cold Cough

If the cough is accompanied by obvious exterior wind-cold syndrome such as severe aversion to cold, mild fever, and absence of sweating, ephedra and perilla leaf can be added to enhance the power of dispersing wind-cold. Ephedra can induce sweating and relieve exterior syndrome, and relieve asthma by regulating the lung; perilla leaf can relieve exterior syndrome and disperse cold, regulate qi and soothe the middle. The combination of the two with Cough-Stopping Powder can better treat wind-cold cough.

2. Wind-Heat Cough

If coughing is accompanied by wind-heat exterior syndrome such as high fever, slight aversion to wind and cold, and sore throat, mulberry leaf, chrysanthemum, forsythia, etc. can be added to disperse wind and clear heat. Mulberry leaf and chrysanthemum can disperse wind-heat and clear the liver and improve eyesight, and forsythia can clear heat and detoxify and disperse wind-heat, which can effectively relieve the symptoms of wind-heat cough.

3. Excessive Phlegm

If there is excessive phlegm in coughing, pinellia ternata and poria cocos can be added to dry dampness and resolve phlegm. Pinellia ternata can dry dampness and resolve phlegm, lower adverse qi and stop vomiting, and poria cocos can promote diuresis to eliminate dampness, strengthen the spleen and resolve phlegm, enhancing the phlegm-resolving effect of the prescription.

4. Persistent Cough

For those with persistent cough that does not heal, tussilago farfara and schisandra chinensis can be added to astringe the lung and relieve cough. Tussilago farfara can moisten the lung, lower qi and relieve cough and resolve phlegm, and schisandra chinensis can astringe the lung to relieve cough, generate fluid and stop sweating. When combined with Zhisousan, it can treat both the principal and secondary aspects of the disease and cure persistent cough.

VIII. Dosage (Traditional & Concentrated Granules)

1. Traditional Method (Powder & Decoction)

The original powder formula is made by grinding platycodon grandiflorum, schizonepeta tenuifolia, aster tataricus, stemona sessilifolia, rhizoma et radix cynanchi stauntonii, licorice root, and dried tangerine peel into fine powder. It is usually taken by mixing with warm water after meals or before going to bed. Those who initially feel wind-cold can take it with ginger decoction to enhance the curative effect. In modern clinical practice, it is more commonly decocted with sliced traditional Chinese medicine. Soak it in cold water for 30 minutes before decocting, bring to a boil over high heat and then turn to low heat and decoct for 15 - 20 minutes (it should not be decocted for a long time because it contains schizonepeta tenuifolia). Take 1 dose daily, warm it and take it in two divided doses in the morning and evening.

2. Modern Concentrated Granules (Ready-to-Drink)

Modern scientific traditional Chinese medicine extracts and concentrates the whole formula into decoction-free granules (such as Nongbenfang, Eu Yan Sang, etc.). The dosage needs to strictly follow the specifications of each pharmaceutical factory or the doctor's prescription. Bottled granules are usually taken by stirring and dissolving them in 100 - 150 ml of warm water before meals or between meals and then taken warm; the individually packaged granules are taken according to the instructions on the outer box. Children need to consult a professional traditional Chinese medicine doctor to reduce the dosage according to age or weight.

IX. Precautions & Contraindications

1. Avoid for Yin Deficiency Cough

This formula is only suitable for treating wind-cold cough (such as cough persisting after a cold, itchy throat, expectorating thin white phlegm). If it shows dry cough without phlegm, dry mouth and night sweats (yin deficiency), or expectorating thick yellow purulent phlegm, fever and sore throat (lung heat), it must not be taken, otherwise it will aggravate the condition.

2. Precautions for Decoction & Medication

If using traditional Chinese medicine sliced pieces for decocting, bring to a boil over high heat and then turn to low heat and decoct for 15 to 20 minutes. Prolonged decocting will cause the medicinal effects to volatilize. If taking western medicine simultaneously, there must be at least a 1-hour interval between traditional Chinese medicine and western medicine to avoid interference between drug components.

3. Strict Diet during Medication

When taking the medicine, it is necessary to fast from raw and cold cold drinks to avoid damaging the stomach by cold and accumulating phlegm; at the same time, it is necessary to avoid spicy, greasy and sweet foods, and quit smoking and drinking, so as not to stimulate the trachea, promote dampness and generate heat, resulting in more difficult recovery of cough.

10. Modern Research Progress

1. Pharmacological Research

Zhisou San achieves comprehensive conditioning of the respiratory tract through "multiple components, multiple targets". Active ingredients such as quercetin, luteolin, and amygdalin in the formula can effectively inhibit the respiratory center and dilute sputum. At the same time, it can regulate the Th17/Treg immune balance, reduce airway hyperresponsiveness, and precisely block inflammatory signaling pathways such as IL-6 and TNF-α, thereby reducing inflammatory damage to airway epithelial cells.

2. Clinical Research Results

Multiple Meta-analyses and evidence-based medicine data have confirmed that the total effective rate of Zhisou San in treating post-infectious cough, cough variant asthma and other diseases is significantly better than conventional Western medicine. Clinical data show that this formula can not only significantly improve the lung function indexes (such as FEV1) of patients, but also reduce the disease recurrence rate and the incidence of adverse reactions to an extremely low level, and rarely show side effects such as dry mouth or drowsiness commonly seen in Western medicine.