Er Xian Tang
Star二仙汤 (Two Immortals Decoction)
Source: Contemporary formula (Contemporary, 1950)
Last updated August 30, 2026
Description
Er Xian Tang (Two Immortals Decoction) is a modern TCM formula developed in the 1950s at Shuguang Hospital in Shanghai, specifically for menopausal syndrome. It addresses the complex pathology of menopause — simultaneous Kidney Yin and Yang deficiency with Liver fire — by warming Kidney Yang, nourishing Kidney Yin, and clearing deficiency fire while regulating the Chong and Ren channels.
Composition
| Herb | Amount | % | Role | Function |
|---|---|---|---|---|
| Xian Mao | 9g | 18.75% | Jun (Chief) | Warms Kidney yang and strengthens the sinews and bones |
| Yin Yang Huo | 9g | 18.75% | Jun (Chief) | Warms Kidney yang and tonifies essence |
| Ba Ji Tian | 9g | 18.75% | Chen (Deputy) | Warms and tonifies Kidney yang without drying |
| Dang Gui | 9g | 18.75% | Chen (Deputy) | Nourishes blood and harmonizes the Chong and Ren vessels |
| Huang Bai | 6g | 12.5% | Zuo (Assistant) | Drains Kidney fire and clears deficiency heat |
| Zhi Mu | 6g | 12.5% | Zuo (Assistant) | Nourishes yin and clears deficiency heat |
Total weight: 60g
Energetics dose-weighted
The formula's overall nature, taste balance and channel reach, weighted by each herb's dose. Classical formulas often pair warm and cool herbs on purpose, so a net figure summarises the mix — it doesn't describe every herb in it.
Nature
Net slightly warm (+0.44)
From 100% of the weighed grams.
Grams by band: cold 25%, warm 56%, hot 19%.
Pairs warm and cool. 75% of the weighed grams are warm or hot and 25% cool or cold — the net is their average, not the whole story.
Taste
- pungent 47%
- sweet 34%
- bitter 19%
From 100% of the weighed grams.
Channels reached
- Kidney 81%
- Liver 75%
- Spleen 38%
- Heart 19%
- Lung 13%
- Large intestine 13%
Share of the grams entering each channel, from 100% of the weighed grams.
Dose-weighted from each herb's recorded nature, taste and channels (missing values are left out, never counted as neutral). It describes the composition — it is not a recommendation.
Preparation
Decoct in water 30 minutes. Take warm in 2 doses/day.
Dosage
Decoction: 1 dose/day. Can be used long-term through menopausal transition.
Conditions Addressed
Relationships
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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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