1. Source and History of Formulas

1. Origin Background of Shensu Decoction

Shensu Decoction (or Shensu Tang) Originating from the crystallization of traditional medical wisdom, it has a long history that can be traced back to ancient times. In ancient times, through long-term medical practices and observations of diseases, people gradually accumulated rich experience in using herbs. Shensu Tang came into being under such circumstances, aiming to address various exogenous diseases and related discomfort symptoms. Shensu Tang (and its modern dosage form, Shensu Granules) was first recorded in the official classic of the Song Dynasty, Taiping Huimin Hejiju Fang, which is the first pharmacopoeia of patent medicines promulgated by the government in Chinese history. In the Song Dynasty, due to the developed commerce and the gathering of population, epidemic diseases such as exogenous wind-cold frequently occurred. At that time, medical experts found that patients with weak constitutions (qi deficiency) often couldn't bear the overly strong diaphoretic herbs. Therefore, under the promotion of the Hejiju, a national pharmaceutical institution, Shensu Tang emerged as an authoritative formula that balanced strengthening the healthy qi and dispelling pathogenic factors, formally establishing the standard for treating colds in the weak.

The core treatment logic of this formula is concisely summarized in its name: Shen originally referred to ginseng (now often replaced by codonopsis pilosula in clinical practice), aiming to tonify the qi of the spleen and lung, addressing the problem of insufficient healthy qi in patients and their inability to expel pathogenic factors. Su refers to perilla leaf, which is responsible for dispersing wind-cold and regulating qi movement. Through this combination of tonifying and dispersing, Shensu Tang can not only expel exogenous pathogenic factors but also regulate qi and resolve phlegm using Chinese herbs such as pinellia ternata, dried tangerine peel, and platycodon grandiflorum in the formula. This idea of strengthening the healthy qi and relieving the exterior accurately addresses the pain points of patients with qi-deficiency colds, such as prolonged colds, accompanied by cough and excessive phlegm, and weakness in physical strength, and is thus hailed as the top formula for qi-deficiency colds by later generations.

2. Development of Shensu Decoction

Over time, Shensu Decoction has been continuously studied and applied by medical experts in different dynasties. Medical experts of each generation adjusted and improved the formula based on their own clinical experiences. After nearly a thousand years of inheritance and evolution, Shensu Tang has not only been widely included in medical masterpieces of the Ming and Qing dynasties but remains the cornerstone of the treatment of traditional Chinese medicine respiratory diseases to this day. With the modernization of pharmaceutical technology, the traditional decocted herbal medicine has evolved into the instant Shensu Granules. While retaining the core compatibility of the ancient formula, it has greatly improved the convenience of taking medicine. In modern applications, it is often used to treat common colds, influenza, or acute exacerbations of chronic bronchitis in people with a relatively weak constitution, reflecting that the wisdom of ancient Chinese medicine still has strong vitality and practical value in contemporary society.

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

1. Ruler Herb - Ginseng

Ginseng is the key monarch herb in Shensu Decoction. It tastes sweet and slightly bitter, is slightly warm in nature, and enters the spleen, lung, heart, and kidney meridians. It has the effects of greatly tonifying primordial qi, restoring pulse and arresting collapse, tonifying the spleen and benefiting the lung, promoting fluid production and nourishing blood, calming the mind and improving intelligence. In Shensu Decoction, ginseng can greatly tonify primordial qi, enhance the healthy qi of the human body, improve the body's immunity, help resist the invasion of exogenous pathogenic factors, and at the same time tonify the qi of the lung, making the qi of the lung sufficient and better promoting the functions of the lung's dispersion and descent. It has a good conditioning effect on symptoms such as weakness of the lung qi caused by exogenous factors.

2. Minister Herb - Perilla Leaf

Perilla leaf tastes pungent and is warm in nature, and enters the lung and spleen meridians. It has the effects of relieving exterior syndrome by dispelling wind-cold and regulating qi and harmonizing the stomach. It can disperse wind-cold pathogenic factors and has a good relieving effect on symptoms such as aversion to cold, fever, headache, and nasal congestion caused by exogenous wind-cold. At the same time, perilla leaf can regulate qi and relieve distension in the middle jiao, and can regulate the qi stagnation in the spleen and stomach and chest distress and vomiting caused by exogenous factors, assisting ginseng to enhance the formula's effects of relieving the exterior and regulating qi movement. It is an indispensable minister herb in Shensu Decoction.

3. Assistant Herb - Pinellia

Pinellia ternata tastes pungent, is warm in nature, and is toxic, and enters the spleen, stomach, and lung meridians. It can dry dampness and resolve phlegm, lower adverse qi and stop vomiting, dissipate binds and disperse nodules. In Shensu Decoction, pinellia ternata can dry dampness and resolve phlegm, and regulate the situation of phlegm-dampness obstruction that may occur in exogenous diseases, preventing phlegm-dampness from further aggravating the condition. At the same time, its effect of lowering adverse qi and stopping vomiting can relieve the vomiting symptoms caused by the upward adverse flow of stomach qi due to exogenous factors, assisting the monarch and minister herbs to better exert their therapeutic effects.

4. Assistant Herb - Peucedanum

Peucedanum praeruptorum tastes bitter and pungent, is slightly cold in nature, and enters the lung meridian. It has the effects of lowering qi and resolving phlegm, dispersing wind and clearing heat. It can lower qi and resolve phlegm, making the qi of the lung smooth, and has a good therapeutic effect on symptoms such as fullness of the lung qi, cough, and excessive phlegm in exogenous diseases. At the same time, its effect of dispersing wind and clearing heat can assist perilla leaf and other herbs to enhance the power of relieving the exterior and clearing heat, further clearing exogenous pathogenic factors. It is one of the important assistant herbs in Shensu Decoction.

5. Adjuvant Drug - Licorice Root

Licorice is sweet in taste, neutral in nature, and belongs to the heart, lung, spleen, and stomach meridians. It has the functions of invigorating the spleen and replenishing qi, moistening the lung and relieving cough, clearing heat and detoxifying, and harmonizing all medicinal herbs. In Shensu Decoction, on the one hand, licorice can invigorate the spleen and replenish qi, enhance the functions of the spleen and stomach, and promote the digestion and absorption of drugs; on the other hand, it can harmonize all medicinal herbs, enabling each medicinal herb in the formula to better cooperate and play its role, alleviating the drastic nature of the drugs in the formula, and making the whole formula more gentle and effective.

III. Shensu Decoction: Pathogenesis, Efficacy, and Treatment Principle

1. Pathogenesis Analysis

Shensu Decoction The pathogenesis it targets is mainly exogenous wind-cold, internal retention of phlegm-dampness, and deficiency of vital qi. When the vital qi of the human body is weak, the pathogenic wind-cold is likely to invade the muscle surface, resulting in exogenous symptoms such as aversion to cold, fever, headache, and nasal congestion. At the same time, the transportation and transformation functions of the spleen and stomach are weakened, making it easy to generate phlegm-dampness. The internal obstruction of phlegm-dampness will further aggravate the condition, presenting symptoms such as cough with profuse phlegm, chest distress, and vomiting.

2. Efficacy Description Analysis

Shensu Decoction has the effects of boosting qi and relieving the exterior, regulating qi and resolving phlegm. By using herbs such as ginseng to greatly tonify the primordial qi and enhance the vital qi of the human body, perilla leaf and other herbs to disperse the pathogenic wind-cold, pinellia ternata and peucedanum praeruptorum and other herbs to dry dampness and resolve phlegm, lower qi and relieve cough, and licorice to harmonize all medicinal herbs, it jointly achieves the effects of relieving the exterior and dispelling cold, resolving phlegm and relieving cough, and regulating qi movement, enabling the vital qi of the human body to be restored, the exogenous pathogenic factors to be dispelled, and the phlegm-dampness to be resolved.

3. Indications

Shensu Decoction is mainly used to treat exogenous wind-cold with internal retention of phlegm-dampness in the weak. Symptoms include aversion to cold, fever, no sweating, headache, nasal congestion, cough with white phlegm, chest and diaphragm fullness and oppression, listlessness, weakness, shortness of breath, and reluctance to talk. Whether it is the elderly, children, or those with a weak constitution, when suffering from wind-cold accompanied by internal obstruction of phlegm-dampness, Shensu Decoction can be used for conditioning and treatment.

IV. Analysis of Shen Su Yin Formula Principles

1. Combining Exterior Resolving with Strengthening Healthy Qi

In the formula, herbs such as perilla leaf and schizonepeta tenuifolia can relieve the exterior and dispel cold, quickly dispelling the pathogenic wind-cold in the muscle surface. Ginseng greatly tonifies the primordial qi and enhances the vital qi of the human body, enabling the vital qi to be sufficient to resist exogenous pathogenic factors. This combination of relieving the exterior and strengthening the healthy qi can not only effectively dispel the exogenous pathogenic factors but also avoid damaging the vital qi due to excessive relieving of the exterior, embodying the principle of strengthening the healthy qi and eliminating pathogenic factors in traditional Chinese medicine treatment.

2.Promoting Phlegm Resolving and Regulating Qi

Phlegm-resolving herbs such as pinellia ternata and peucedanum praeruptorum cooperate with qi-regulating herbs such as tangerine peel and magnolia officinalis. Pinellia ternata dries dampness and resolves phlegm, peucedanum praeruptorum lowers qi and resolves phlegm, tangerine peel regulates qi and strengthens the spleen, dries dampness and resolves phlegm, and magnolia officinalis regulates qi to relieve fullness, promotes qi movement and relieves distension. Their synergistic effect can effectively resolve the internal accumulated phlegm-dampness, regulate qi movement, make the lung qi smooth, and the spleen and stomach function normally, thus relieving symptoms such as cough with profuse phlegm, chest distress, and vomiting.

3. Coordinating Effects of Herbs

Licorice plays a key role in harmonizing all medicinal herbs in the formula. It can alleviate the drastic nature of herbs such as ginseng and perilla leaf, making the property of the whole formula more gentle. At the same time, licorice can also coordinate the mutual relationship between each medicinal herb in the formula, enhance the overall efficacy of the formula, enable the medicinal herbs to better play their synergistic role, and achieve the purpose of treating diseases.

V. Comparison of Shensu Decoction

1. Comparison with Baidu Powder

Jiebai Powder Its main effects are to dispel cold and dampness, boost qi and relieve the exterior, with the emphasis on relieving the exterior and dispelling dampness. It is mainly used to treat the syndrome of exogenous wind-cold-damp pathogen. Shensu Decoction pays more attention to boosting qi and resolving phlegm while relieving the exterior, and is more suitable for patients with exogenous diseases who have insufficient healthy qi and are accompanied by phlegm-dampness. Jiebai Powder has a stronger effect on relieving the exterior, while Shensu Decoction relatively focuses more on strengthening the healthy qi and resolving phlegm to relieve the exterior.

2. Comparison with Mahuang Decoction

Mahuang Decoction is a typical formula for relieving exogenous wind-cold syndrome. It is mainly used to treat the exterior excess syndrome of exogenous wind-cold, manifested as aversion to cold, fever, absence of sweating, and panting, with a floating and tense pulse. Shensu Decoction is used to treat exogenous wind-cold in the weak with internal phlegm-dampness syndrome, with exterior symptoms such as aversion to cold, fever, and absence of sweating, but at the same time accompanied by symptoms of phlegm-dampness and weakness of healthy qi, such as copious white phlegm, fullness and oppression in the chest and epigastrium. There are obvious differences in pathogenesis, treatment, and medication between the two.

VI. Shen Su Yin Clinical Applications

1. Cold

For those with a weak constitution who catch a cold, manifested as aversion to cold, fever, headache, nasal congestion, copious phlegm, and general fatigue, Shensu Decoction is a commonly used formula. It can boost the healthy qi while relieving the exterior, resolve phlegm and stop coughing, effectively relieve cold symptoms, and promote the recovery of the body.

2. Bronchitis

When patients with bronchitis have exogenous wind-cold induced cough, copious clear phlegm, accompanied by aversion to cold, fever, fullness and oppression in the chest and epigastrium, Shensu Decoction can exert its effects of boosting qi and relieving the exterior, regulating qi and resolving phlegm, relieve symptoms, and control the development of the disease.

3. Other Respiratory Diseases

For some respiratory diseases caused by exogenous wind-cold and internal phlegm-dampness, such as pharyngitis, tonsillitis, etc., if there are symptoms similar to those treated by Shensu Decoction, Shensu Decoction can also be selected for modification according to specific conditions to achieve the purpose of relieving symptoms and regulating the body.

7. Additive and Subtractive Changes

1. Those with more severe harmony

Almond and Tussilago farfara can be added to enhance the effect of stopping cough. Almond can lower qi, stop cough and relieve asthma, and Tussilago farfara can moisten the lungs, lower qi, and stop cough and resolve phlegm. Adding these two herbs can make the cough-stopping effect of Shensu Decoction better, and it is suitable for patients with obvious cough symptoms.

Severe Aversion to Cold

Ephedra and Cinnamon Twig can be added to enhance the power of relieving exterior cold. Ephedra has a strong effect of inducing sweating and relieving the exterior, and Cinnamon Twig can relieve the muscles, promote sweating, and warm and dredge the meridians. For patients with more severe aversion to cold symptoms, adding these two herbs appropriately can effectively relieve the aversion to cold symptoms and enhance the exterior-relieving effect of the formula.

3. Those with heavy phlegm-dampness

Poria cocos and Atractylodes macrocephala can be added to strengthen the spleen and promote diuresis, enhancing the effect of resolving phlegm. Poria cocos promotes diuresis and percolates dampness, strengthens the spleen. Atractylodes macrocephala invigorates the spleen qi, dries dampness and promotes diuresis, which can further improve the transportation and transformation function of the spleen and stomach, reduce the generation of phlegm-dampness, and make the Shensu Decoction more targeted in treating diseases with severe phlegm-dampness.

VIII. Dosage (Traditional and Modern)

1. Traditional Methods

The traditional usage is to decoct the medicinal slices by adding water. Generally, 10 - 15 grams of ginseng, 6 - 10 grams of perilla leaf, 6 - 10 grams of Qigen, 6 - 10 grams of Pinellia ternata, 6 - 10 grams of Peucedanum praeruptorum, 9 grams of Poria cocos, 6 grams of Magnolia officinalis, 6 grams of Platycodon grandiflorum, 4 grams of Aucklandia lappa, 6 grams of Citrus reticulata, and 3 grams of roasted Glycyrrhiza glabra are used. Put these medicines into the pot, soak them in an appropriate amount of water for about 30 minutes, then boil them with strong fire, and then change to slow fire and decoct for 20 - 30 minutes. Take the juice, 1 dose per day, and warm it and take it in 2 - 3 times.

Modern Concentrated Granules

Taking modern concentrated granules is more convenient. The dosage varies slightly according to the specifications of different manufacturers, but generally, it is equivalent to the dosage of traditional slices. When using, just take each concentrated granule with an appropriate amount of boiling water according to the instructions, 1 dose per day, and take it in 2 - 3 times. Modern concentrated granules retain the efficacy of traditional Chinese medicine, and are convenient to carry and take, suitable for the modern fast-paced lifestyle.

IX. Precautions and Taboos

1. Dietary Taboos

During the period of taking the Shensu Decoction, it is necessary to avoid eating stimulating foods such as raw and cold, greasy, and spicy foods. Raw and cold foods are likely to damage the yang qi of the spleen and stomach and affect the transportation and absorption of the medicine. Greasy foods are not easy to digest and will increase the burden on the spleen and stomach. Spicy foods may help generate fire and heat, aggravate the external symptoms, and are not conducive to the recovery of the illness.

2. Special Populations

Pregnant women should use the Shensu Decoction with caution because some drugs in the formula may have an impact on the fetus. When children use it, the dosage should be adjusted appropriately according to age and constitution, and it needs to be taken under the guidance of a doctor. The elderly and those with extremely weak constitutions need to closely observe the body's reaction during the medication process, and inform the doctor in time if there is any discomfort.

3. Disease Changes

If the symptoms do not significantly relieve or the condition worsens after taking the Shensu Decoction, such as continuous fever, aggravation of cough, abnormal color of phlegm, etc., medical treatment should be sought in time, the condition should be re-evaluated, and the treatment plan should be adjusted, and the original formula should not be taken continuously by oneself.

X. Modern Research Progress

1. Pharmacological Action Research

Modern research shows that ginseng in the Shensu Decoction has the effects of regulating immune function and enhancing the body's anti-stress ability. Perilla leaf has antibacterial, antiviral, anti-inflammatory and other effects. Pinellia ternata can relieve cough and resolve phlegm, and regulate gastrointestinal function. Peucedanum praeruptorum has the effects of resolving phlegm and relieving asthma. These drugs are mutually compatible, making the Shensu Decoction have a certain pharmacological basis in regulating the body's immunity and relieving respiratory symptoms.

2. Clinical Effect Verification

Multiple clinical studies have confirmed the effectiveness of the Shensu Decoction in treating diseases such as exogenous pathogens attacking the healthy qi of the weak. By observing patients of different ages and different conditions, it is found that the Shensu Decoction can effectively relieve symptoms such as aversion to cold and fever, cough with phlegm, and physical fatigue, improve the quality of life of patients, and promote physical recovery, providing more scientific basis for its clinical application.

Summary

Shensu Yin is a traditional Chinese medicine formula for strengthening the healthy qi and relieving exterior syndrome, used for exterior contraction of wind-cold due to qi deficiency or exterior contraction of wind-cold in the weak with internal phlegm-damp syndrome (phlegm-fluid fever, internal injury of phlegm-fluid, phlegm accumulation in the middle jiao). Patients often present with aversion to cold and fever, common cold fever, headache and nasal congestion, sweating slightly or not sweating at all and then recovering, cough with profuse phlegm, fullness and oppression in the chest and diaphragm (fullness and oppression in the chest and epigastrium), lassitude and weakness, shortness of breath and reluctance to speak, dizziness and discomfort, palpitation and hiccupping, residual heat on the face, white tongue coating, and weak pulse. The herbs in this formula include ginseng, perilla leaf (perilla), kudzu root, pinellia, tangerine peel, bitter orange, platycodon root, poria, licorice, Chinese date (1 Chinese date), and fresh ginger (7 slices of fresh ginger, add fresh ginger). It has the functions of benefiting qi and relieving exterior syndrome, dispersing lung qi and resolving phlegm, regulating qi and resolving phlegm. Decoct with 220 ml of water until 140 ml remains. It can be modified clinically and has good curative effect on exterior contraction of wind-cold due to qi deficiency.