Educational information, not medical advice — ask your doctor or midwife.
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Baekjeon is the dried root and rhizome (underground stem) of Cynanchum stauntonii, a marsh plant in the milkweed family. In Korean herbal medicine it is given for a wet, rattly cough — the kind that brings up phlegm. It is usually simmered into a tea with two or three other herbs rather than taken alone.
It is classed as a single drug (Korean). The Latin name is Cynanchum stauntonii. You may also see it sold as willowleaf swallowwort rhizome.
Here is the honest verdict up front: baekjeon has a long, well-documented place in East Asian herbal practice, but we found no published human trials of it. Long traditional use is not proof that something works, and this library scores the two things on separate axes. Read the rest of the page with that gap in mind.
Classical Korean and Chinese texts describe baekjeon as a herb that "drives down" rebellious lung qi and loosens phlegm, so a cough clears rather than rattles. That is a traditional model, not a tested mechanism.
Laboratory and animal work points to steroid-type sugar compounds that may thin mucus and calm coughing reflexes in test animals. None of that has been confirmed in people.
So the fair summary is that nobody has shown how baekjeon behaves in the human lung, or whether it does anything measurable at all at the doses used in tea.
The traditional form is the dried, sliced root and rhizome, simmered in water to make a decoction (a strong boiled tea). This is how nearly all recorded use has happened.
You may also meet it as a powder, in granules, or as one ingredient in a ready-made Korean or Chinese cough formula. A honey-fried version exists; the root is stir-baked with honey, which traditional practice says makes it gentler on the throat.
Tinctures and capsules are sold in some Western shops. There is no standard strength across these products.
Baekjeon has been used in Korean medicine for centuries as a cough and phlegm herb, and it appears in the shared East Asian materia medica under the name baiqian. Written records of the plant go back to Chinese texts of roughly the 5th to 6th century CE. It is a familiar, ordinary herb in the tradition rather than a rare or ceremonial one.
See a doctor if your cough lasts more than three weeks, or if you cough up blood or green-brown phlegm. Get urgent help if you are short of breath at rest, have chest pain, a high fever, or your lips or fingertips look blue. Stop the herb and get checked the same day if you have vomiting that will not settle, severe stomach pain, a spreading rash, or yellowing of your skin or the whites of your eyes, which can be a sign of liver trouble. Tell your doctor or pharmacist you are taking baekjeon, especially before any surgery.
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 baekjeon 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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