Educational information, not medical advice — ask your doctor or midwife.
Ban Bian Lian is a small, low-growing herb from China. Its plant name is Lobelia chinensis. The whole dried plant is used as a single herb.
Chinese medicine uses it to "clear heat" and drain extra water. Healers gave it for snake bites, swelling from fluid, and hot skin sores. It is also added to larger herb formulas.
Long use in a tradition is not proof that a herb works. We found no clear human trials of Ban Bian Lian. So the modern evidence for it is very weak, and this page treats it as a traditional herb only.
No one has shown how Ban Bian Lian works in the human body.
The plant holds lobeline and related plant chemicals. In lab tests, lobeline acts on the same nerve switches that nicotine acts on. That may explain why too much of it causes nausea, a racing heart and shaking.
Animal work hints that it raises urine flow and eases swelling. Some lab work suggests it calms signs of inflammation (heat, swelling and pain). These are animal and dish findings, not proof in people.
Some labs test extracts on cancer cells in a dish. Cells in a dish are a long way from a person. Do not read those tests as a treatment claim.
Dried whole plant is the main form. It is simmered in water to make a decoction (a strong herb tea). Fresh plant is also used in China.
You may also see granules or a powder extract. Some shops sell it inside mixed Chinese formulas. Traditional practice crushes the fresh plant and puts it on bites and sores.
Do not confuse it with Lobelia inflata, sold in the West as "lobelia". That is a different and more toxic plant. Check the Latin name on the label.
Ban Bian Lian has been used in China for hundreds of years. It is listed in Ming dynasty herb books, including Li Shizhen's Ben Cao Gang Mu of 1596. The name points to its one-sided flower.
It became best known as a country remedy for snake bite. Folk healers also used it for swelling, jaundice (yellow skin and eyes) and skin sores.
It is still a common single herb in Chinese practice today. It is used in one tradition, not across many.
Some reactions to Ban Bian Lian need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Stop the herb and see a doctor if you feel sick to your stomach, dizzy, shaky, or notice a fast or uneven heartbeat.
See a doctor within a day if you have new or worsening swelling, yellow skin or eyes, very little urine, or muscle weakness.
Call emergency services now if you have a fit (seizure), faint, cannot breathe well, or have a pounding heart that will not settle. Do the same for any snake bite, with or without the herb.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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