Educational information, not medical advice — ask your doctor or midwife.
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Bai Xian Pi is the dried root bark of Dictamnus dasycarpus, a plant in the rue family. In Traditional Chinese Medicine it is used for hot, red, itchy or weeping skin. It is a single herb, and it is almost always one part of a larger formula.
Practitioners also use it for hives, damp skin sores and some joint aches with heat. It is boiled into a decoction (a water extract made by simmering). It is also used in washes and soaks for the skin.
There are no good human trials of this herb on its own. Long use in a tradition is not proof that a herb works. Reports also link Bai Xian Pi to liver injury, so real care is needed.
The honest answer is that no one has shown how it works in people. What we have is laboratory and animal work.
In test tubes and in animals, extracts appear to calm some immune and allergy signals. Some lab work also shows they slow the growth of certain fungi and bacteria. Whether any of that happens on human skin is not established.
One lab finding matters for safety. Dictamnine, a main compound, appears to damage DNA in test tubes when UV light is present. Treat that as a warning flag, not a proven risk in people.
Bai Xian Pi is sold as dried, sliced root bark for simmering into a decoction. Granules and powder extracts are also common.
It is used on the skin too. Herbalists add it to washes, soaks and creams for itching. Tinctures (alcohol extracts) exist but are less common.
It is rarely taken alone. It usually sits inside a multi-herb formula chosen for you. Quality and labelling vary a lot between suppliers.
Bai Xian Pi appears in Chinese medical writing from roughly the 5th century CE. Classical authors placed it with herbs said to clear heat and dry damp.
It has been a staple skin herb in Chinese medicine ever since. It shows up in many classical formulas for rashes, sores and itching.
Some reactions to Bai Xian Pi need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Stop the herb and see a doctor the same day if your skin or the whites of your eyes turn yellow. Do the same for dark urine, pale stools, pain under your right ribs, feeling sick, or unusual tiredness. These can be signs of liver injury.
Get urgent care for swelling of the lips, tongue or throat, trouble breathing, or a rash with fever and blistering.
See your doctor if a rash spreads, weeps or smells bad, or if itching lasts more than two weeks. Tell any doctor you see that you took this herb.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Bai Xian Pi is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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