Educational information, not medical advice — ask your doctor or midwife.
Oryeongji is the dried droppings of a flying squirrel. In Korean medicine it is given for pain that feels sharp and stays in one spot. Most often that means period pain or belly pain.
The animal is Trogopterus xanthipes. In English the drug is called flying squirrel faeces. It is a single drug, used on its own or in a mix with other herbs.
Here is the plain verdict. No human trials have tested it. Its standing rests on long use in old texts, and long use is not proof that a thing works.
Korean medicine explains it by blood flow. The drug is said to move blood that has become stuck, and stuck blood is seen as the cause of sharp, fixed pain. On that view, moving the blood eases the pain.
Modern science has not tested this idea in people. A few lab studies report that extracts relax the muscle of the gut wall and slow clotting in a test tube. Test tube results often do not carry over to the human body.
So the honest answer is that we do not know how, or whether, it acts in a person.
It comes as small dark dried pellets. Shops sell them whole or ground into a powder.
Two prepared kinds are common. One is raw and simply cleaned. The other is stir-fried with vinegar, which old texts say makes it gentler on the stomach.
It is most often boiled with other herbs into a tea. It also goes into honey pills and powders. It is rarely sold on its own outside East Asia.
The drug appears in East Asian herb books from about the 8th century on. Korean doctors took it up, and it is listed in the Donguibogam, the great Korean herb text of 1613. It has stayed a named single drug in Korean and Chinese practice ever since.
See a doctor straight away if you bleed and it will not stop, if you pass black or bloody stools, or if you vomit blood.
Also see a doctor if you get a fever, chills or bad diarrhoea after taking it, or if you come out in a rash, swell up or find it hard to breathe.
Book a normal appointment if your belly pain or period pain is new, severe or getting worse. Pain like that needs a cause found, not just a 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 oryeongji 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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