Tokishakuyakusankabushi
Quick Facts
- What it is: A doctor-prescribed Kampo formula that contains processed aconite root, a plant that can cause fatal heart rhythm problems.
- Main uses: Cold hands and feet in a traditional cold pattern, Period pain and irregular periods, Dizziness and tiredness, Fluid retention, Pain that feels worse in cold weather
- Active ingredients: Aconitine, Mesaconitine, Hypaconitine, Benzoylaconine and related monoester alkaloids, Coumarins from Angelica acutiloba
- Forms: Prescription granules in sachets, Prescription powder, Prescription tablets, Pharmacy-prepared liquid in clinical settings
- Side effects: Tingling lips and limbs, vomiting, then dangerous heart rhythms; poisoning can be fatal and has no reliable antidote.
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What is Tokishakuyakusankabushi?
Tokishakuyakusankabushi is a prescription Kampo medicine that contains processed aconite root. Aconite is one of the most poisonous plants used in any medical system. Aconite poisoning can stop the heart, and there is no reliable antidote.
The name itself is the warning label. "Kabushi" means Bushi, or processed aconite root, added to the base formula Tokishakuyakusan. Processing lowers the toxin load, but it does not remove it.
The gap between a working amount and a harmful one is very small. Batches of plant material differ. Heart or liver problems make a person more fragile still.
In Japan this is a prescription product. A doctor decides on it, and a pharmacist dispenses it. It is not a self-care herb, and no honest page can teach you to use it alone.
The evidence verdict is simple. Human research on this aconite-added formula is very thin, while the poisoning risk is well recorded. Long use in Kampo is not proof that a remedy works, and it is not proof that it is safe.
This page describes the formula so you can recognise the risk. It gives no dose, no amount, no preparation method and no place to buy it.
How does Tokishakuyakusankabushi work?
The medicine and the poison work through the same target: sodium channels. These are tiny gates that let nerve and heart cells fire.
In laboratory and animal studies, aconite alkaloids hold those gates open. Nerve cells then fire over and over. Heart muscle can slip into a fast, chaotic rhythm.
That pattern explains the order of poisoning signs. Numb lips and tingling limbs tend to come first. Vomiting, a racing or irregular heartbeat and collapse can follow.
The same channel effect is what traditional prescribers were after in tiny, controlled amounts. They used aconite to produce warmth and a lift in energy. That effect and the toxic effect are not separate, which is why the margin is so narrow.
In Kampo terms, the base formula was said to nourish blood and move fluid, and aconite was said to warm a cold, depleted body. These are traditional ideas about patterns. They are not measured drug actions.
The base herbs also touch the blood system. Angelica acutiloba contains coumarins, natural compounds that can slow clotting. In people already taking blood thinners, that adds a second, separate risk.
Risk rises when the body cannot clear the alkaloids well. Poor liver function and poor kidney function both matter. Low potassium and existing heart disease make a dangerous rhythm more likely.
What forms does Tokishakuyakusankabushi come in?
In Japan the formula appears as a regulated prescription product. Common forms are granules in sealed sachets, fine powder and tablets.
Some hospital and clinic settings use a liquid made from raw herbs by a pharmacy team. That is done inside a supply chain that tests the material.
Raw aconite root is also sold as a crude herb in some countries. In that form the alkaloid content is unknown to the buyer. It has caused deaths.
Unlabelled aconite products are sometimes offered online or brought back from travel. Treat these as unsafe. Labels may be wrong, and the strength is unknown.
This page does not describe how any form is made, processed or taken.
Where it comes from:
Tokishakuyakusan, the base of this formula, was recorded in an early Chinese medical text, the Jingui Yaolue, around the third century. It later became a core formula in Japanese Kampo practice.
Practitioners used it for women described as pale, tired, cold and prone to swelling. It was a standard choice for period problems and for dizziness with fatigue.
Adding Bushi was a deliberate step for patients seen as deeply cold and weak. The aconite was meant to add warmth to the base formula. Prescribers treated the addition with great care.
Aconite has a long double history in East Asia. It was valued as a strong medicine and also used as an arrow poison. Classical texts warned repeatedly about deaths from it.
That history is a record of practice, not a safety record. It is described here to explain why the formula exists, not to suggest you try it.
If this is an emergency
Some reactions to Tokishakuyakusankabushi 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 Tokishakuyakusankabushi?
- Do not use this formula unless a doctor has prescribed it for you and a pharmacist has dispensed it.
- Never buy aconite-containing products online, from abroad or from an unlicensed seller.
- Do not use if you are pregnant or trying to become pregnant.
- Do not use if you are breastfeeding.
- Never give this to a child or a teenager.
- Do not use if you have any heart rhythm problem, heart failure, or have had a heart attack.
- Do not use if you have liver disease (a liver that does not work properly).
- Do not use if you have kidney disease (kidneys that do not work properly).
- Do not use if you have hypokalaemia (low potassium in the blood).
- Do not use if you take warfarin or any other blood thinner.
- Do not use if you take digoxin or any drug for an irregular heartbeat.
- Do not use if you take diuretics (water pills).
- Do not use if you take any other product that contains aconite, Bushi or Fuzi.
- Avoid alcohol while this medicine is in your body.
- Never take more than your prescriber told you, and never take a missed amount twice over.
- Do not use if you have a bleeding disorder or surgery planned.
When should you see a doctor?
Call emergency services at once if you notice any of these after taking an aconite product:
Numb or tingling lips, tongue, mouth or face. Pins and needles or numbness in the hands, arms, feet or legs. Nausea, vomiting or stomach pain.
A racing, slow or irregular heartbeat. Chest pain or tightness. Trouble breathing.
Dizziness, fainting or collapse. Cold, clammy skin with sweating. Muscle weakness or confusion.
Do not wait to see if it passes. Aconite poisoning can turn into a fatal heart rhythm within a short time, and there is no reliable antidote.
Take the packet or product with you, or send a photo of the label. Do not drive yourself to hospital.
Is Tokishakuyakusankabushi legal where you live?
In Japan, Tokishakuyakusankabushi is a ministry-approved Kampo medicine available on prescription, dispensed by a physician or pharmacist; lower-strength versions are sold over the counter there.
Aconite is tightly controlled elsewhere. In the UK it is restricted and cannot be sold to the public as a general herbal product. In the United States it is not accepted as a dietary supplement ingredient and has been the subject of safety warnings. Canada and Australia also restrict aconite in over-the-counter herbal products, and Hong Kong limits processed aconite to registered practitioners.
Options to discuss with a clinician
Start with a diagnosis, not a formula. The symptoms this product was used for have many causes, and several are treatable.
For cold hands and feet, ask your doctor about thyroid tests, iron levels and circulation checks. Raynaud's and thyroid problems both have proven treatments.
For period pain or irregular periods, ask about standard pain relief, hormonal options and tests for fibroids or endometriosis. A clinician can match these to your history.
For tiredness with dizziness, ask for blood tests. Low iron, low vitamin B12 and low blood pressure are common and easy to check.
For swelling, ask for a heart and kidney review. New or one-sided swelling needs prompt assessment.
If you want to stay within Kampo, ask a Kampo-trained doctor about formulas that contain no aconite. The base formula Tokishakuyakusan and other gentler options exist, and a prescriber can tell you whether one fits you.
Every one of these routes goes through a clinician who knows your full medical history and medicine list.
Graded pages for the options named above:
- Vitamin B12 — evidence grade A, traditional tier T0
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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