☯ TCM Properties
Discharges pus and removes putridity topically
Traditional Chinese Uses
Sheng Yao ("ascending medicine") is a processed mineral preparation of mercury compounds, principally red mercuric oxide (HgO), produced by subliming mercury with niter and alum; the red form is Hong Sheng and the yellow Huang Sheng. Pungent and hot, it is a strictly external agent in traditional external medicine (surgery), where it is the classic drug to discharge pus and remove putridity (necrotic tissue): a minute amount is dusted onto, or set on paper wicks inserted into, chronic non-healing ulcers, sinuses, and abscess cavities to clean them so healthy granulation can form. It has also been applied to stubborn eczema, impetigo, and tinea.
Because it is a strongly toxic mercury salt, it is never taken internally and is used only in tiny amounts, almost always blended with calcined gypsum (Shi Gao) and wound-healing herbs to moderate its action. Mercury preparations are toxic and heavily restricted; this is historical practice, described here for reference and not endorsed for self-use.
Botanical Description
Sheng Yao (升药), literally "ascending medicine," is a traditional Chinese mineral-medicinal preparation, not a plant. It comprises crystalline mercury compounds — principally red mercuric oxide (HgO) in the form known as Hong Sheng Dan, or yellow mercuric oxide (Huang Sheng Dan) — produced by sublimation from a charge of mercury, alum, and nitre (potassium nitrate) heated in a closed vessel. The resulting needle-like red or orange-yellow crystals were historically scraped from the lid of the reaction crucible and used externally on chronic ulcers, fistulae, and suppurative skin lesions to debride necrotic tissue. Because mercuric oxides are acutely toxic and dermally absorbed, modern Chinese pharmacopoeial use is highly restricted to external application in trace amounts; the substance is omitted from many modern formularies on safety grounds.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| poultice | As needed | Daily | — | — | — |
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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