Chuan Wu
Quick Facts
- What it is: A restricted, highly poisonous Chinese medicine root that can throw the heart out of rhythm and kill.
- Main uses: Cold, aching joint pain in old Chinese texts, Cold belly pain, Rubbed on the skin for local pain
- Active ingredients: Aconitine, Mesaconitine, Hypaconitine
- Forms: Dried root slices (raw herb, restricted), Pharmacy-treated root in practitioner formulas, Patent pills and powders from Asia, Plasters, oils and liniments
- Side effects: Numb lips, vomiting, weakness and an uneven heartbeat that can stop the heart.
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What is Chuan Wu?
Chuan Wu is the dried main root of Aconitum carmichaelii, and it is one of the most poisonous herbs used in Chinese medicine. Its poisons attack the heart. They can set off a wild heartbeat that stops blood from moving.
The gap between an old-style dose and a deadly one is very small. A small slip in amount, plant part, or root strength can cross that gap. Deaths have been recorded in China, Hong Kong, Australia and Europe.
In Chinese medicine the root was used for cold, deep joint and body pain. Long use in a tradition is not proof that a herb works or that it is safe. That rule holds for every herb on this site.
Human proof of benefit is thin. Proof of harm is strong and easy to find. This page is here to explain the danger, not to help anyone take it.
How does Chuan Wu work?
Chuan Wu works on the tiny gates that let nerve and heart cells fire. Its poisons hold those gates open. The cells then fire over and over.
At first this can numb pain and make the skin feel warm or tingly. That was the effect old texts were after. The same action is what does the harm.
In the heart, held-open gates scramble the beat. The beat can turn fast and chaotic. The heart may then stop pumping blood well, and the person can collapse.
The poison also hits nerves that run breathing and muscle power. That is why a poisoned person feels weak, numb and short of breath. Blood pressure can drop at the same time.
There is no safe line between the two effects. The amount that dulls pain sits very close to the amount that harms the heart. That is the whole reason this root is restricted.
What forms does Chuan Wu come in?
Chuan Wu turns up as dried root slices sold as a raw herb. Sale to the public is restricted in many countries.
It also appears inside multi-herb formulas made up by trained practitioners. Some patent pills and powders from Asia contain it. Labels do not always say so in plain English.
Rub-on oils, plasters and pain liniments may hold aconite root as well. These are not safe just because they are not swallowed.
Fu Zi and Cao Wu come from the same plant family and carry the same kind of risk. Roots get mixed up in trade. If you have any product naming one of these, do not take it.
Where it comes from:
Chuan Wu appears in Chinese medical writing going back about two thousand years. Early texts placed it with the harsh, poisonous herbs. Healers used it for cold, deep pain in the joints and belly.
Classic formulas paired it with other herbs said to soften its danger. The old books carried warnings about it even then. Aconite was also smeared on arrow tips for hunting and war.
The root stays in the Chinese Pharmacopoeia today as a controlled, prescription-only herb. Registered practitioners use pharmacy-treated forms, never the raw root from a shelf. None of that makes home use safe.
If this is an emergency
Some reactions to Chuan Wu need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Who should avoid Chuan Wu?
- Do not use if you are treating yourself, with any form of this root, in any amount
- Do not use if you have a heart problem, such as an uneven heartbeat, heart failure or past heart attack
- Do not use if you take heart rhythm drugs, digoxin, beta blockers or calcium channel blockers
- Do not use if you take water tablets (diuretics), which can drop your potassium and raise heart risk
- Do not use if you are pregnant, trying to become pregnant, or breastfeeding
- Do not use if you are buying it for a child or giving it to one
- Do not use if you have kidney disease or liver disease, since your body clears poisons more slowly
- Do not use if you have broken, cut or raw skin and are thinking about a rub-on aconite product
- Do not use if you drink alcohol or take sedatives (drugs that make you sleepy)
- Do not use if you find aconite, Chuan Wu, Cao Wu or Fu Zi on a label, even in a mixed formula; ask a pharmacist instead
When should you see a doctor?
Call emergency services now if you or someone else may have taken aconite. Do not wait to see if it passes.
Warning signs include:
- Numb or tingling lips, tongue, face or fingers - Vomiting, belly pain or loose stools soon after taking a herb - A racing, slow or uneven heartbeat, or a pounding chest - Chest pain, shortness of breath or sweating - Dizziness, fainting or a sudden drop in strength - Blurred sight, muscle twitching or a fit
Tell the call handler that aconite or Chuan Wu may be involved. Take the packet, pills or herb with you to hospital. Do not drive yourself.
Is Chuan Wu legal where you live?
In the UK, aconite root may not be sold to the public. It is a restricted herbal ingredient under the Human Medicines Regulations 2012, so supply is tightly limited.
In the United States it is not accepted as a supplement ingredient, and the FDA has warned people about aconite products. In Australia it is listed as a poison and banned from general sale. In Hong Kong and mainland China it is a controlled herb that only trained practitioners may supply.
Options to discuss with a clinician
Do not swap one risky herb for another on your own. Take this list to a doctor, pharmacist or registered practitioner and decide together.
For ongoing joint or muscle pain, ask about:
- Pharmacy pain gels, such as a rub-on anti-inflammatory (a medicine that eases swelling and pain). - Capsaicin cream, made from chilli, for some kinds of nerve and joint pain. - Plain paracetamol or an oral anti-inflammatory, if your doctor says they suit you. - Heat packs, gentle movement and physiotherapy, which have solid support for stiff, achy joints.
If you want to stay with herbs, a registered Chinese medicine practitioner can suggest non-poisonous choices. Herbs such as Du Huo, Sang Ji Sheng or Wei Ling Xian are used for similar complaints without aconite's heart risk.
Ginger and turmeric are far gentler options studied for aches. They still interact with some drugs, so run them past a pharmacist.
New chest pain, a racing heart or bad belly pain are not herb problems. Get those checked by a doctor first.
Graded pages for the options named above:
- Sang Ji Sheng — evidence grade D, traditional tier T2
- Du Huo — evidence grade insufficient, traditional tier T3
- Ginger — evidence grade A, traditional tier T3
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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