Educational information, not medical advice — ask your doctor or midwife.
Zhi Shi Xiao Pi Wan is a traditional Chinese herbal formula. It is used for fullness, pressure or bloating below the ribs and in the upper belly. That feeling often comes with poor appetite and loose stools.
Its English name is Unripe Bitter Orange Pill to Reduce Focal Distention.
It is sold as one finished product. The pill itself holds about ten herbs. Bitter orange (Zhi Shi) and magnolia bark (Hou Po) are the main pair.
They are joined by warming, building herbs. These include ginseng, white atractylodes and poria. There is also a small amount of cold, bitter coptis (Huang Lian).
Here is the honest evidence picture. This formula has a long, well-recorded place in Chinese medicine. But we could not find good human trials of the finished formula.
So its benefits are not proven in the way a modern medicine's are. Long traditional use tells you a formula has been valued and refined. It does not tell you that it works.
We make that point once here, rather than in every section below.
In traditional Chinese medicine terms, the formula is said to move stuck qi downward. It is also said to dry damp and clear a little heat. And it is said to strengthen the spleen and stomach.
That is the language of the tradition. It is not a description of body chemistry.
In modern terms, several ingredients have measurable actions in the lab. Bitter orange peel holds synephrine, which can stimulate the heart and blood vessels. Coptis holds berberine, which affects gut bacteria and gut movement in animal studies.
Lab findings are not the same as a proven effect in people taking the whole pill. No study we could find shows which ingredient, if any, brings the relief users report.
You will usually meet it in one of these forms:
Small black teapills, the most common ready-made form Loose powder or granules to stir into hot water A raw herb mix simmered into a tea (a decoction) by a practitioner Capsules or tablets from Western supplement brands
Strength varies a lot between brands. Ready-made pills are not set to a measured amount of synephrine or berberine. So two products with the same name may not be equally strong.
The formula is credited to Li Dongyuan. He was a major Chinese doctor of the Jin-Yuan period. It appears in his work Lan Shi Mi Cang (Secret Record of the Orchid Chamber), from around the 13th century.
It builds on an older, simpler pill called Zhi Zhu Wan (bitter orange and atractylodes). It has stayed in steady use in Chinese medicine for about 700 years. It also appears in modern Chinese herb reference books and teaching texts.
Stop taking it and get medical help straight away if you have chest pain, a pounding or racing heartbeat, severe headache, sudden weakness, or swelling in your face or throat.
See a doctor within a few days if you notice puffy ankles, muscle weakness or cramps, or if a blood pressure reading is higher than usual. These can be signs of low potassium or rising blood pressure from the licorice in the blend.
Do not treat yourself with this formula if you have unexplained weight loss, vomiting, blood in your stool, black stools, trouble swallowing, or belly pain that keeps getting worse. Those need a proper diagnosis first.
Also see a doctor if your bloating or fullness has not improved after two to three weeks.
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 Zhi Shi Xiao Pi Wan 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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