San Ren Tang
Classical TCM Formula Profile
Part of the HJMEDICAL TCM Discovery Center
三仁湯 · Sān Rén Tāng
A classical warm-disease formula for early damp-warmth with heavy body, afternoon fever and chest oppression.
Read the complete guide →Quick Facts
- Formula Category
- Dampness-Draining Formulas
- Primary Pattern
- Damp-Heat
- Primary Function
- Diffuse Qi, resolve damp, clear heat gently
- Primary Therapeutic Principle
- Open the three jiao, resolve damp and gently clear heat
- Classical Source
- Wen Bing Tiao Bian (Wu Jutong, 1798)
- Available as Granules
- Yes
Formula Overview
A classical warm-disease formula for early damp-warmth with heavy body, afternoon fever and chest oppression.
Therapeutic Principle
Traditionally selected for early damp-warmth with body heaviness and afternoon fever, rather than epidemic damp-heat, jaundice, or exterior cold-damp sudden turmoil.
Composition: Sovereign, Minister, Assistant, Envoy
Every herb in the formula, grouped by the job it does in the classical hierarchy.
君SovereignTreats the main pattern
杏仁Xing Ren9g
Bitter Apricot Kernel- diffuses the lung qi and Moves qi to reduce dampness
白豆蔻Bai Dou Kou6g
Round Cardamom- transforms dampness and moves middle qi
薏苡仁Yi Yi Ren15g
Coix Seed / Job's Tears- sweet
- bland
- and cold
- percolates dampness and promotes urination to fortify the spleen
- guides damp-heat downward to the
- lowers jiao
佐/使Assistant & EnvoyTreats accompanying patterns, harmonises the whole
厚樸Hou Po6g
Magnolia Bark- moves qi and remove dampness
- dissipates masses and relieves fullness
半夏Ban Xia9g
Pinellia Rhizome- moves qi and remove dampness
- dissipates masses and relieves fullness
通草Tong Cao6g
Tetrapanax Pith- moves qi and remove dampness
- dissipates masses and relieves fullness
淡竹葉Dan Zhu Ye6g
Lophatherum / Bamboo Leaf- moves qi and remove dampness
- dissipates masses and relieves fullness
滑石Hua Shi15g
Talcum- sweet and cold
- strengthens the function to drain dampness and clears heat
Classical Composition
- Armeniacae Semen Amarum (Xing Ren) 5 qian (15g)
- Talcum (Hua Shi) 6 qian (18g)
- Tetrapanacis Medulla (Tong Cao) 2 qian (6g)
- Amomi Fructus Rotundus (Bai Dou Kou) 2 qian (6g)
- Lophatheri Herba (Zhu Ye) 2 qian (6g)
- Magnoliae Officinalis Cortex (Hou Po) 2 qian (6g)
- Coicis Semen (Yi Yi Ren) 6 qian (18g)
- Pinelliae Rhizoma (Ban Xia) 5 qian (15g)
Dosages follow the classical source and are shown for study, not as a prescription.
Related Conditions
Related Health Topics
Actions
- Disperses and diffuses qi movement
- clears and removes damp-heat.
Indications
- San Ren Tang is indicated for the pattern of more dampness than heat in the early stage of damp-warmth and summerheat-warmth with dampness.
- The symptoms are headache, aversion to cold, heavy body, general pain, fatigue, a light yellow complexion, chest distress without hunger, afternoon fever, and no thirst.
Tongue & pulseThe tongue coating is white and the pulse is wiry, thin, and soggy.
Traditional Pathogenesis
Cause & mechanism
- San Ren Tang is a common formula used in the early stages of damp-warmth where the pathogen is in the qi level with more dampness than heat.
- Generally, there are two causes for this condition.
- One is external damp-heat contraction.
- The other is internal dampness and fluid accumulation with external pathogen contraction.
- When the internal and external pathogens mix together, damp-warmth is the result.
- When wei yang is obstructed by dampness, there is headache and aversion to cold.
- Symptoms such as a heavy body, general pain, and fatigue are induced because of the heavy, turbid nature of dampness.
- When damp-warmth stagnates in the spleen and stomach, there will be a dysfunction of transformation and a blockage of qi movement causing chest distress without hunger.
- Dampness is a yin pathogen that is active between 3 to 7 pm.
- Thereby, afternoon fever results from the conflict between zheng qi and pathogenic qi.
Treatment strategy
- The treatment principle is to open the three jiao, resolve damp and gently clear heat.
How does this formula compare?
Clinical Perspective
San Ren Tang, Gan Lu Xiao Du Dan, Yin Chen Hao Tang and Huo Xiang Zheng Qi San all address damp. Gan Lu Xiao Du Dan is broader epidemic damp-heat; Yin Chen Hao Tang focuses on damp-heat jaundice; Huo Xiang Zheng Qi San releases exterior and resolves turbid damp for sudden turmoil. San Ren Tang opens the three jiao for early damp-warmth with heavy body and afternoon fever.
Clinical Differentiation
- San Ren Tang is applicable to patterns of more dampness than heat in the early stages of damp-warmth.
- This clinical pattern is marked by headache and aversion to cold, heavy body and general pain, fever at afternoon, white tongue coating without thirst.
Safety notes: This formula is not applicable for patients with heat more than dampness marked by a yellow and greasy tongue coating.
For educational reference only, based on traditional pattern differentiation — not a substitute for professional advice.
Frequently Asked Questions
What are the actions of San Ren Tang?
San Ren Tang has the actions of diffusing and regulating Qi throughout the San Jiao and clearing Damp-Heat. It is the representative formula for early Damp-Warmth when Dampness predominates over Heat.
Which modern diseases is San Ren Tang suited to?
Modern TCM clinical practice commonly applies it to individuals whose pattern differentiation falls within Damp-preponderant Heat, including lingering low-grade or afternoon fever of Damp-Warmth type, gastroenteritis with heaviness and poor appetite, certain urinary tract or kidney inflammations, and Damp-Heat arthritis when the body feels heavy and the tongue coating is white and greasy rather than yellow and dry.
Is San Ren Tang suitable for improving body heaviness, afternoon fever, and chest oppression without much thirst?
For presentations of headache with mild aversion to cold, heaviness and aching of the body, fatigue, chest oppression with no desire to eat, afternoon fever, a white greasy tongue coating without thirst, and a soggy or wiry-fine-soft pulse — in those whose pattern differentiation confirms early Damp-Warmth with Damp heavier than Heat — TCM commonly applies San Ren Tang as an adjunct. It cannot replace evaluation of infectious or systemic febrile illness.
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San Ren Tang: Classic TCM Formula for Early-Stage Damp-Heat, Headache & Heavy Body
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Huo Xiang Zheng Qi San: Classic TCM Formula for Summer-Heat, Dampness & Gastrointestinal Upset
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Medical Disclaimer
For general TCM education only — not medical advice. Consult a qualified TCM practitioner or licensed healthcare provider before use, especially if pregnant, nursing, on medication, or managing a chronic condition.