Xiao Xian Xiong Tang — Minor Sinking the Chest Decoction

On this page

1. Overview
2. TCM pattern
3. Key herbs
4. Formula actions
5. Conditions treated
6. Comparisons with related formulas
7. Modifications
8. Cautions

Overview

Xiao Xian Xiong Tang — the “Minor Sinking the Chest Decoction” — is a Han-dynasty formula from Zhang Zhongjing’s Shang Han Lun (c. 220 CE). Three herbs — Huang Lian, Ban Xia, Gua Lou — in elegant combination resolve Phlegm-Heat accumulation in the chest and epigastrium.

It is the “minor” version of Da Xian Xiong Tang (which uses harsher Da Huang, Mang Xiao and Gan Sui for the major chest-bind syndrome of acute serious chest pain with hard masses). Xiao Xian Xiong Tang is for the milder, far more common pattern of Phlegm-Heat causing focal distention, fullness, productive cough with yellow sputum, and oppressive sensation in the chest.

Modern uses are particularly for acid reflux, hiatus hernia, chronic bronchitis with productive yellow phlegm, and the everyday picture of patients with diet-driven Phlegm-Heat in the chest and stomach.

I prescribe Xiao Xian Xiong Tang as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan.

TCM pattern

Xiao Xian Xiong Tang is prescribed for Phlegm-Heat accumulation in the chest and epigastrium:

• Focal distention or fullness in the epigastrium — uncomfortable on light pressure
• Cough with sticky yellow phlegm
• Acid reflux, bitter taste
• Chest oppression and tightness
• Constipation with hard, dry stools
• Slight nausea
• Tongue — red, particularly at the centre, thick yellow greasy coat
• Pulse — slippery and rapid; or wiry and slippery

Key herbs

1. Huang Lian (Coptis chinensis) — clears Heart and Stomach Heat
2. Ban Xia — transforms Phlegm and descends Stomach Qi
3. Gua Lou (Trichosanthes fruit) — transforms Phlegm-Heat and opens the chest

Formula actions

1. Clears Heat
2. Transforms Phlegm-Heat
3. Opens the chest and resolves focal distention
4. Descends rebellious Qi

Conditions treated

1. GERD and acid reflux with Phlegm-Heat pattern — see acid reflux
2. Hiatus hernia symptoms with Phlegm-Heat — see hiatal hernia
3. Chronic bronchitis with sticky yellow phlegm
4. Acute bronchitis with chest oppression
5. Functional dyspepsia with epigastric fullness and Heat signs
6. Atypical chest pain from Phlegm-Heat (alongside cardiology assessment)
7. Persistent cough after febrile illness with sticky yellow phlegm
8. Smoker’s cough with productive yellow phlegm
9. Pleurisy alongside conventional care

Comparisons with related formulas

• Da Xian Xiong Tang — for severe Heat-stagnation chest-bind with acute pain; rarely used in modern outpatient practice.
• Ban Xia Xie Xin Tang — for mixed Cold-Heat in the middle burner with focal distention but vomiting and diarrhoea predominating.
• Qing Qi Hua Tan Wan — for chronic Phlegm-Heat in the Lung; less acute.
• Wen Dan Tang — for Phlegm-Heat with anxiety and insomnia.

Modifications

• For prominent acid reflux, add Hai Piao Xiao and Wa Leng Zi
• For severe constipation, add small dose of Da Huang
• For chronic bronchitis, add Zhe Bei Mu and Yu Xing Cao
• For anxiety overlay, combine with Wen Dan Tang principles
• For Qi stagnation overlay, add Zhi Shi and Mu Xiang

Cautions

Not appropriate for cold-pattern chest fullness (white phlegm, cold extremities, pale tongue) — the cold herbs will worsen Cold.

Not appropriate for Yin-deficient cough with peeled tongue and night sweats.

Acute severe chest pain needs immediate cardiology assessment to exclude angina, MI and other emergencies. Call 999 for any acute chest pain with sweating, breathlessness, arm or jaw radiation.

Use cautiously in pregnancy; Ban Xia and Huang Lian both require careful consideration.

Always consult a qualified Chinese herbalist registered with the RCHM.

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