Da Cheng Qi Tang
Star大承气汤 (Major Order the Qi Decoction)
Source: Shang Han Lun — Zhang Zhongjing (Han, 220)
Last updated July 22, 2026
Description
Da Cheng Qi Tang (Major Order the Qi Decoction) is the most powerful purgative formula in TCM, clearing Yang Ming organ excess heat through strong purgation. It treats dry stool, severe constipation, and accumulation of heat in the Large Intestine with signs of Yang Ming heat excess. Given its strength, it should be used only when the condition clearly matches and discontinued once the bowels move.
Composition
| Herb | Amount | % | Role | Function |
|---|---|---|---|---|
| Da Huang | 12g | 25% | Jun (Chief) | Purges heat and stagnation, clears Large Intestine. |
| Mang Xiao | 9g | 18.75% | Chen (Deputy) | Softens hardness, moistens dryness, purges heat. |
| Hou Po | 15g | 31.25% | Zuo (Assistant) | Moves Qi, disperses fullness, eliminates distension. |
| Zhi Shi | 12g | 25% | Zuo (Assistant) | Breaks Qi stagnation, reduces accumulation. |
Total weight: 45g
Preparation
Decoct Da Huang separately for only 3–5 minutes (over-cooking reduces purgative effect). Add Mang Xiao to the strained decoction just before taking. Take on empty stomach.
Dosage
Decoction: Take warm. Discontinue immediately once stools loosen. Not for use in deficiency patients, post-partum, or during pregnancy.
Conditions Addressed
Related Formulas
Similar Formulas by composition
Match score combines dosage-weighted composition (cosine, 70%) with shared-herb overlap (Jaccard, 30%).
Traditional formula information is for educational purposes only. Herbal formulas should be prescribed by a qualified practitioner — dosages and combinations are individualized and can interact with medications.
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