Educational information, not medical advice — ask your doctor or midwife.
Bai Qian is a dried root and rhizome (underground stem) used in Chinese herbal medicine. It comes from two related plants, Cynanchum stauntonii and Cynanchum glaucescens. It is also sold as Willowleaf Swallowwort Root or Cynanchum Rhizome.
It is a single herb, not a ready-made formula. Herbalists use it for a wet cough, meaning a cough that brings up a lot of phlegm (thick mucus). It is nearly always simmered into a tea with several other herbs rather than taken alone.
Here is the short verdict on the evidence. Bai Qian has a long record in Chinese medicine, but we found no human trials of the herb on its own. Long traditional use is not proof that a herb works, and that gap applies to everything on this page.
In traditional terms, Bai Qian is said to loosen phlegm and send qi (the body's moving energy) downward, which practitioners believe settles a cough. That is a traditional way of describing what people observed. It is not a lab finding.
Laboratory and animal work suggests the root holds compounds that may thin mucus and quiet the cough reflex. This research is early and small. No one has shown the same effect in people.
Bai Qian is sold as dried sliced root, either raw or stir-fried with honey. Honey-fried Bai Qian is the form herbalists usually pick for a dry, ticklish throat.
You may also meet it as a powder, a granule you stir into hot water, or one named herb inside a patent cough formula. Buy it from a supplier who labels the plant species. Related Cynanchum plants look similar and some are not safe.
Bai Qian appears in Chinese materia medica from around the fifth century CE, in the Ming Yi Bie Lu (Miscellaneous Records of Famous Physicians). It has stayed in use ever since for coughs with heavy phlegm.
It is listed in the Chinese Pharmacopoeia today. Its standing is that of a reliable working herb in one tradition, not a famous tonic.
See a doctor if your cough lasts longer than three weeks, or if it keeps getting worse. Get medical help the same day if you cough up blood, run a high fever, feel short of breath, have chest pain, or are losing weight without trying.
Stop the herb and call a doctor if you keep vomiting, get bad stomach pain, or notice a rash, swelling of the face or lips, or trouble breathing. Anyone with asthma or COPD (a long-term lung disease) should keep taking their prescribed inhalers and speak to their own doctor before adding herbs.
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 Qian 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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