Keishikaryojutsubuto

What is Keishikaryojutsubuto?

Keishikaryojutsubuto is a Japanese Kampo herbal formula that contains aconite root (bushi). Aconite holds heart toxins with a very small safety margin. Poisoning can cause a deadly heart rhythm, so the formula is prescribed by doctors in Japan and restricted in many other countries.

The name means Cinnamon Twig Decoction with poria, atractylodes and aconite added. A doctor or pharmacist dispenses it for stubborn joint and nerve pain. It is not a self-care remedy, and this page gives no dose and no way to make it.

The formula also contains licorice (kanzo). Licorice can lower potassium, a body salt the heart needs. Low potassium makes aconite heart rhythm trouble more likely, so the two risks stack.

Evidence verdict: we found no human trials of this formula. Most of the human record is poisoning case reports.

The formula does hold a settled place in Kampo practice. Long use in a tradition is not proof that a remedy works, or that it is safe.

How does Keishikaryojutsubuto work?

Start with the harm. Aconite alkaloids (strong plant chemicals) act on sodium channels. These are tiny gates that let salt particles move into nerve and heart cells.

Lab and animal studies show the alkaloids hold these gates open. Nerve and heart cells then fire when they should be quiet.

In people, this shows up as tingling, numbness and vomiting. It can also set off ventricular tachycardia (a very fast, dangerous heartbeat). At high levels the heart can stop.

Licorice adds a second problem. It can push potassium (a key body salt) out of the blood. A heart low in potassium is more likely to fall into a bad rhythm.

Now the claimed benefit. In Kampo theory, the formula warms the body and drives out cold and damp from the joints. That is a traditional model, not a tested mechanism.

In animal and lab work, aconite alkaloids appear to dull pain signals. Whether that helps patients at levels that stay safe is not settled.

What forms does Keishikaryojutsubuto come in?

In Japan the formula comes as a pharmacy granule, powder or tablet, given on prescription. Raw herb packets are also used in clinic practice.

Every form contains aconite. The form does not make it safe. A neat granule sachet carries the same class of risk as loose herbs.

Some online sellers ship look-alike products from other countries. These are often not checked to the same standard. Alkaloid content can swing widely between batches.

Do not buy aconite-containing products online. This page names no seller and no source on purpose.

Where it comes from:

Kampo is the Japanese school of herbal medicine, built on old Chinese texts. Cinnamon Twig Decoction comes from the Shanghan Lun, a Han dynasty Chinese work.

Japanese practitioners later added poria, atractylodes and aconite. They used the result for pain that felt worse in cold, wet weather. It was chosen for people judged cold, tired and weak in the limbs.

Aconite was known as a poison for as long as it was known as a drug. Old texts treated it with care and paired it with other herbs said to soften it.

Japan's health ministry later approved the formula as an ethical Kampo medicine. That approval put it in the hands of doctors and pharmacists. It was never meant for home use.

What does Keishikaryojutsubuto help with?

• Joint pain that feels worse in cold, damp weather: This was the classic Kampo use. Practitioners picked it for aching, stiff joints in people who felt cold. We found no controlled human trials for this use. So the claim rests on practice reports, not on tested results.
• Neuralgia (nerve pain): Kampo prescribers have used it for shooting or burning nerve pain in the limbs. No human trial of this formula for nerve pain was found. Aconite alkaloids dull pain signals in animal studies, but that does not show benefit in people.
• Long-term low back pain: Traditional texts linked back pain of this type to cold and damp. The formula was given to warm and move. Evidence in people is missing. Standard care for back pain has been studied far better and is much safer.
• Stiff, aching shoulders, arms and legs: Practitioners used it for heavy, stiff limbs with poor tolerance of cold. There is no trial support. Stiffness with swelling can also signal a treatable joint disease, which needs a proper diagnosis first.
• Cold, painful hands and feet: The formula was seen as warming, so it was used for cold extremities with pain. No human trials were found. Cold, painful hands and feet can point to circulation, thyroid or nerve problems, so see a doctor rather than self-treat.

What are the side effects of Keishikaryojutsubuto?

• Tingling or numbness in the mouth, tongue, face or hands
• Nausea, vomiting or stomach pain
• Racing, pounding or uneven heartbeat
• Ventricular tachycardia (a very fast, dangerous heart rhythm)
• Chest pain or trouble breathing
• Low blood pressure, dizziness or fainting
• Cold, clammy skin and heavy sweating
• Muscle weakness or trouble moving the limbs
• Blurred vision or confusion
• Low potassium (a key body salt) from the licorice in the formula
• Swelling of the ankles, weight gain and raised blood pressure from licorice
• Skin rash or itching
• Rare liver injury, seen with some Kampo products
• Death, in serious aconite poisoning

Good to know:

Aconite poisoning is an emergency, not a side effect to wait out. Signs often begin within minutes to two hours.

Tingling of the mouth or hands is a classic early warning. Vomiting, a racing heart or fainting means the heart may already be affected.

Get emergency care at once. Do not take another dose to see what happens.

Is Keishikaryojutsubuto legal where you live?

In Japan, Keishikaryojutsubuto is a ministry-approved prescription Kampo medicine, dispensed by a doctor or pharmacist; lower-strength versions are sold over the counter there. In the United Kingdom, aconite for internal use may only be supplied on prescription. Australia bars Aconitum from over-the-counter herbal products. In the United States it is not an approved medicine, and aconite products have drawn safety warnings.

Options to discuss with a clinician

Talk to a doctor first. Joint and nerve pain has many causes, and the right treatment depends on which one you have.

For joint pain, ask about these options:

- Guided exercise or physiotherapy - A rub-on anti-inflammatory gel (a painkiller applied to the skin) - Simple oral painkillers your doctor judges safe for you - Heat packs, warm clothing and pacing of activity - Weight support and footwear advice for knees and hips

For nerve pain, ask about nerve pain tablets and about treating the cause, such as a trapped nerve or diabetes.

If you want to stay with Kampo or Chinese herbal medicine, ask a licensed prescriber for a formula with no aconite and no licorice. Several warming pain formulas exist without either. A prescriber can also check your other medicines.

None of these should be started on your own. Bring the list to a clinician and decide together.

Graded pages for the options named above:

• Exercise — evidence grade A, traditional tier T3