Fu Zi
Quick Facts
- What it is: Fu Zi is a restricted, heart poisoning herb, the treated side root of Aconitum carmichaelii, and it is not safe for self use.
- Main uses: Traditional warming herb for deep cold and cold limbs, Traditional use in collapse with a faint pulse, Traditional use in weak heart with fluid swelling, Traditional use in cold type joint pain
- Active ingredients: Aconitine, Mesaconitine, Hypaconitine, Jesaconitine, Benzoylaconine (a weaker breakdown product)
- Forms: Dried sliced root in bulk, Multi herb formulas, pills and granules from prescribers, Liquid extracts and tinctures sold online, Creams and plasters for joint pain, Very dilute homeopathic products
- Side effects: Mouth and limb tingling, being sick, then an uneven heartbeat, low blood pressure, breathing trouble and death.
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What is Fu Zi?
Fu Zi is the treated side root of a plant called Aconitum carmichaelii. It is one of the most poisonous herbs in Chinese medicine. It holds aconitine, a poison that can throw the heart out of its normal beat and stop it.
How safe it is depends on how the root is treated before use. Raw or badly treated root has killed people. Deaths and near deaths still happen, most often from home brews or from products bought online.
Chinese medicine ranks Fu Zi very highly. But long use in a tradition is not proof that a herb works, and it is not proof that it is safe. Good human trials are few, so we grade the evidence as insufficient.
This page is here to explain the danger. It gives no dose and no way to make or take the herb.
How does Fu Zi work?
Aconitine acts on sodium channels, the tiny gates that let salt move in and out of nerve and heart cells. It holds these gates open. Nerve and heart cells then fire when they should not.
That same action explains both the wanted effect and the harm. Nerves misfire, so the mouth and skin tingle and go numb.
The heart misfires, so the beat can turn fast, uneven and useless. Blood pressure can drop and breathing can fail.
There is no safe gap between the two. The amount that stirs the heart and the amount that harms it sit very close together. Small changes in the plant, the batch or the person can move a dose from active to deadly.
People also differ. Age, heart health, kidney health and other drugs all change the risk. This is why the herb is treated as a restricted medicine in many places, not a supplement.
What forms does Fu Zi come in?
Fu Zi turns up in a few forms. None of them is safe to use on your own.
Dried sliced root is sold in bulk by Chinese pharmacies. Ready made pills, granules and powders list aconite as one herb among many. Liquid extracts and tinctures are sold online, often with no test results.
Creams and plasters are sold for joint pain. Very dilute homeopathic products are a separate thing and hold little or no alkaloid (the plant chemical that causes the harm).
Whole herb formulas are the form most used by trained prescribers. Bulk root and online liquids are the forms most often linked to poisoning.
Heat, time and pairing with other herbs are all part of how prescribers handle this root. We do not describe any of that here, on purpose.
Where it comes from:
Fu Zi has been used in Chinese medicine for about two thousand years. It sits in the oldest herb books, and it stayed in use through every later era.
Doctors called it a warming herb. They gave it when a person felt deeply cold, weak and drained.
Classic texts from around 200 CE placed it in famous formulas for collapse, cold limbs and a faint pulse. It was often paired with other herbs that were said to soften its harshness.
Old writers knew it was risky. They wrote warnings about it and treated the root before use. Poisoning cases were recorded for centuries.
Trained practitioners in China, Japan and Korea still prescribe treated aconite today. It is handled as a potent drug there, with rules about who may supply it.
If this is an emergency
Some reactions to Fu Zi 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 Fu Zi?
- Do not use if you want to take it on your own, without a licensed prescriber watching you
- Do not use if you bought it online or from an untested bulk source
- Do not use if you are pregnant, trying to get pregnant, or breastfeeding
- Do not use if you are a child, or an older adult who is frail or unwell
- Do not use if you have any heart problem, including an uneven heartbeat (arrhythmia), heart failure or past heart attack
- Do not use if you take digoxin, a heart rhythm drug, a beta blocker or a calcium channel blocker
- Do not use if you take water pills (diuretics) or have low potassium (a low level of a salt the heart needs)
- Do not use if you have kidney disease or liver disease, since your body may clear the poison slowly
- Do not use if you drink alcohol with it, or make it into a home wine or soup
- Do not use if you are already taking another aconite herb, such as Chuan Wu or Cao Wu
- Do not use if you have surgery or a procedure planned, and tell your care team about every herb you take
- Do not use if you have a fever, night sweats or other heat signs, which the tradition itself treated as a reason to avoid it
When should you see a doctor?
Aconite poisoning is a medical emergency. Call emergency services at once, or go to the nearest emergency department, if you or someone else has taken aconite and shows any of these signs:
Tingling, burning or numbness in the mouth, tongue, lips or face. Numb or tingling hands, feet, arms or legs. A heartbeat that feels fast, slow, uneven or pounding. Chest pain. Feeling faint, very weak, or unable to stand. Cold clammy skin with heavy sweating. Being sick, with belly pain or watery stools. Trouble breathing. Blurred vision, confusion, a fit, or collapse.
Do not wait to see if it passes. Signs can move from tingling to heart rhythm failure within minutes.
Take the packet, label or leftover herb with you, and tell staff it is aconite. That one word changes how they treat you. Contact your local poison centre if you are unsure.
Is Fu Zi legal where you live?
Aconite is restricted, not a free choice supplement. In the United Kingdom it is a restricted herb and cannot be sold freely to the public. In the United States it is not an accepted supplement ingredient, and the FDA has warned about products that hold it. In Australia it is banned from medicines sold to the public, apart from very dilute products. In mainland China, Hong Kong and Japan, treated aconite is a potent listed medicine that only trained prescribers may supply.
Options to discuss with a clinician
What to consider instead depends on why aconite was suggested. Talk each of these through with a doctor or a licensed practitioner.
If the worry is heart failure or swollen legs, see a doctor. There are heart drugs with strong trial support, and they are checked with blood tests and scans.
If you feel cold and tired all the time, ask for tests. A thyroid problem, low iron, low vitamin B12, poor sleep or low blood sugar can all do this, and each has a clear treatment.
If the problem is joint or back pain in cold weather, ask about heat, steady movement, physiotherapy and simple pain relief.
If you want a warming Chinese herb, a licensed practitioner can suggest far gentler ones, such as dried ginger or cinnamon bark, and check them against your drugs.
If a practitioner still believes aconite is right for you, it should come from a licensed, tested product and be prescribed and watched by someone trained to use it. Never buy it yourself and never adjust it yourself.
Graded pages for the options named above:
- Vitamin B12 — evidence grade A, traditional tier T0
- 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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