Er Chen Tang
Star二陈汤 (Two-Cured Decoction)
Source: Tai Ping Hui Min He Ji Ju Fang (Song, 1107)
Last updated July 22, 2026
Description
Er Chen Tang (Two-Cured Decoction) is the foundational formula for phlegm and damp in TCM. Its name refers to the two aged (chen) key herbs: Chen Pi and Ban Xia. Together they dry dampness, transform phlegm, regulate Qi, and harmonize the Stomach. As the basis for dozens of phlegm-treating formulas, Er Chen Tang is one of the most versatile base formulas in the TCM canon.
Composition
| Herb | Amount | % | Role | Function |
|---|---|---|---|---|
| Ban Xia | 12g | 36.36% | Jun (Chief) | Dries dampness, transforms phlegm, harmonizes Stomach. |
| Chen Pi | 9g | 27.27% | Chen (Deputy) | Regulates Qi, dries dampness, transforms phlegm. |
| Fu Ling | 9g | 27.27% | Zuo (Assistant) | Drains dampness, strengthens Spleen. |
| Gan Cao | 3g | 9.09% | Shi (Envoy) | Harmonizes all herbs, moderates drying. |
Total weight: 30g
Preparation
Decoct all herbs in water for 20–25 minutes. Take warm. Use with Sheng Jiang to enhance anti-nausea effect.
Dosage
Decoction: 1 dose/day in 2–3 doses. Pills: 6g 3x/day. Adjust based on severity.
Conditions Addressed
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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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