What Bi Xie Shen Shi Tang is for
Bi Xie Shen Shi Tang is for lower-body skin that is red, itchy and weeping at the same time, where the surface is wet rather than dry and the folds are raw and macerated. It clears the Heat behind the redness and drains the Dampness behind the weep.
The lesion is both red and wet, which is the signature: bright redness with a weep of clear or cloudy fluid, itching that is intense and worse in heat and humidity, and raw, macerated skin where two surfaces meet. The surface looks inflamed and sodden rather than dry and scaly. Dampness makes it heavy and slow to settle, Heat makes it red and itchy, and because Dampness is heavy the trouble keeps returning to the legs, feet and folds. The greasy yellow coat of the pattern is the internal sign of the same Heat and Dampness.
Bi Xie leads the draining of turbid Dampness. Yi Yi Ren, Ze Xie, Chi Fu Ling and Hua Shi carry it out, Huang Bo clears Heat and dries Dampness at the site, Mu Dan Pi cools the Blood behind the redness, and Tong Cao opens the channels so the Dampness has a route away. Every herb is cooling or draining, with nothing to build the tissue up, because the pattern is excess and the aim is to move it out.
It is drying throughout, so it is not for dry skin, and it is not for the cold damp pattern where the skin is pale and the fluid is clear. Prolonged use without review can leave the skin drier than it began, so it is given in short courses and reassessed. The hot, wet, red picture is the one it fits, and the skin should be watched for signs of dryness while it is used.
Actions
- Clears Heat and drains Dampness
- Drains turbid Dampness from the lower body
- Cools the Blood
- Relieves itching and weeping
Properties
- Taste and temperature: Predominantly bitter and bland. Bitter clears Heat and dries Dampness, bland drains moisture out through urination.
- Organs: Spleen, Kidney, Bladder
- Channels: Spleen, Kidney, Bladder
The pattern behind it
The pattern is Damp-Heat in the lower body. The Heat produces redness and itch, the Dampness produces weeping and maceration, and the combination settles low because Dampness is heavy. The formula clears the Heat, drains the Dampness and opens the urinary route so the turbidity can leave.
Composition
The herbs in Bi Xie Shen Shi Tang, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| King | Bi Xie | 12 to 15 g | Neutral, Bitter | Drains turbid Dampness from the lower body, the leading herb. |
| Yi Yi Ren | 15 to 30 g | Cool, Sweet, bland | Drains Dampness through the urine and relaxes the sinews. | |
| Chi Fu Ling | 9 to 15 g | Neutral, Sweet, bland | A stronger draining herb that clears Damp-Heat through the urine. | |
| Hua Shi | 15 to 20 g | Cold, Sweet, bland | Guides Damp-Heat out through the urine, the classic route for lower-body Dampness. | |
| Huang Bo | 6 to 10 g | Cold, Bitter | Clears Heat and dries Dampness specifically in the lower body. | |
| Mu Dan Pi | 6 to 10 g | Slightly cold, Bitter, pungent | Cools the Blood and clears the Heat that shows as redness. | |
| Deputy | Ze Xie | 6 to 10 g | Cold, Sweet, bland | Drains Dampness downward through the urine. |
| Envoy | Tong Cao | 3 to 6 g | Slightly cold, Sweet, bland | Opens the channels and gives the Dampness a route out. |
Patterns it treats
Damp-Heat
Lower-body skin that is red, itchy and weeping, with raw macerated folds and a surface that looks inflamed and sodden. Damp-Heat settles low, so the Heat reddens and itches while the Dampness weeps and keeps the lesion wet.
How the formula is built
The formula is almost entirely draining and cooling, with no tonifying herb to slow it down. That is deliberate: Damp-Heat in the lower body needs to be moved out rather than built around, and the multiple draining herbs give it several routes while Huang Bo addresses the Heat at the site.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Decocted in water and taken warm, in two divided doses.
Modifications
- If the Heat is marked, more cooling herbs are added.
- If the weeping is heavy, draining herbs are increased.
- If itching dominates, Wind-dispelling and itch-relieving herbs are added.
- If the pattern turns cold and pale, a warming formula is used instead.
Timing
Taken warm in two divided doses.
Duration
Five to fourteen days per course, reassessed, and two to four weeks for chronic conditions with review.
Diet while taking it
Avoid alcohol, greasy sweet food and cold raw food.
Safety
Contraindications
Avoid in Yin deficiency with Heat signs, since the formula is drying. Avoid on cold pale skin or in cold damp patterns, which need warming.
Interactions
The draining herbs can add to diuretic medication. Berberine from Huang Bo can affect drug metabolism and blood sugar.
Pregnancy
Use with caution in pregnancy. Mu Dan Pi has Blood-moving properties that can theoretically stimulate the uterus, and the draining herbs require guidance.
Breastfeeding
Use only under professional guidance.
Children
Used only with professional supervision.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and persistent anal or genital symptoms need medical diagnosis.
General safety references
General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this formula.
- Review article: Herbal hepatotoxicity - an update on traditional Chinese medicine preparations. Alimentary Pharmacology & Therapeutics, 2014. PMID: 24844799.
- Interactions between herbal medicines and prescribed drugs: an updated systematic review. Drugs, 2009. PMID: 19719333.
- Warfarin and food, herbal or dietary supplement interactions: a systematic review. British Journal of Clinical Pharmacology, 2021. PMID: 32478963.
Origin and history
Recorded in the tradition as a development of the Dampness-draining approach in the Qing dynasty surgical and Damp-Heat literature.
The formula belongs to the Damp-Heat tradition that developed around lower-body skin and urinary problems. Its emphasis on draining turbidity through the urine follows the classical principle that Dampness should be given a route out, and the pairing with Huang Bo places it firmly on the hot side of the lower-body patterns.
Classical record
The formula is recorded as the cooling draining treatment for turbid Damp-Heat in the lower body, with red itchy weeping skin and a yellow greasy tongue coat.
As recorded in the classical record for this formula.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
How is it different from Bi Xie Fen Qing Yin?
That formula is warming and secures the Essence for cold dampness. This one is cooling and draining for Damp-Heat with a yellow greasy tongue coat.
Can it help athlete's foot?
Only the red, itchy, weeping type with heat signs, alongside antifungal treatment if there is infection.
Is it drying?
Yes. It is not suitable for dry skin or for prolonged use without reassessment.
Should persistent anal itch be assessed?
Yes. Persistent symptoms in that area need medical diagnosis before treatment.