Educational information, not medical advice — ask your doctor or midwife.
Bi Xie Fen Qing Yin is a herbal formula from Chinese medicine. It is a mix of herbs, sold as one named product. The main herb is the root of Bi Xie, a wild yam (Dioscorea species).
Old texts use it for cloudy, milky or rice-water coloured urine. It is also used when you pass urine often, or when passing it feels uncomfortable.
The name is usually put into English as "Dioscorea Drink to Separate the Clear". You may also see it sold as Fish Poison Yam Drink to Separate the Clear.
The old idea behind the name is simple. The formula is said to help the body split "clear" fluid from "turbid" (cloudy) fluid. The urine then runs clear again.
Here is the honest verdict, up front. This formula has centuries of standing in Chinese medicine, but there are no good published human trials of the formula itself. Long traditional use is not the same as proof that something works, and this page does not repeat that point further down.
No one has shown in people how this formula works. What follows is theory and lab findings, not proven action.
In traditional terms, the formula is said to separate the clear from the turbid (the cloudy). It is said to drain damp and heat out through the urine. At the same time it warms and steadies the lower body, so urine stops running cloudy.
Lab and animal work hints at more. The saponins in Bi Xie show anti-inflammatory (swelling-calming) action in test tubes. Berberine from Huang Bai kills some bacteria (germs) in the lab.
Che Qian Zi has a mild diuretic (urine-increasing) effect in animals.
None of that has been tested as a finished formula in a proper human trial. So treat the mechanism (how it might work) as an unproven story, not a fact.
You will usually meet it in one of these forms:
Raw herb packets. You simmer them at home into a decoction (a strong tea). This is the traditional way, and the one practitioners prescribe most.
Strong granules or powder. You stir these into hot water. This is the most common modern form.
Ready-made pills, tablets or capsules. These are sold as a "patent" medicine.
Whatever the form, the label should name every herb in the product. Some labels give only a formula name, with no full herb list and no batch testing by the maker. You cannot check those for safety.
The formula shows up in Chinese medical writing from about the 13th to 14th century. It sits in Yang's collected formulas. Zhu Dan-Xi also quotes it in his work.
Cheng Guo-Peng wrote down a second, cooler version in Yi Xue Xin Wu in 1732. He added Huang Bai and Che Qian Zi for cases called damp-heat.
Both versions are still taught in Chinese medical schools today, and both are made and sold. That is why two products with the same name can hold different herbs.
See a doctor before you start, so the cause of your urinary symptoms is properly identified.
Get medical help the same day if you have a fever, chills, pain in your back or side, blood in your urine, or you cannot pass urine at all.
Stop the formula and contact a doctor if you get a rash, swelling of your face or lips, unusual bruising or bleeding, yellowing of your skin or eyes, ongoing vomiting, or if your symptoms have not improved after two 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 Bi Xie Fen Qing Yin 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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