What is Shinbuto?

Shinbuto is a Kampo herbal formula that contains processed aconite root (bushi). Aconite is classed as a poison in most national drug lists. Even after processing, it holds alkaloids that can stop the heart.

The gap between a working amount and a harmful one is narrow. How strong a batch is depends on how the root was treated. Two batches of the same herb are not always the same.

In Japan, Shinbuto is a prescription Kampo medicine (Tsumura 30). A doctor prescribes it and a pharmacist dispenses it. Use is checked, and the person taking it is watched.

This page gives no dose, no amount and no way to prepare it. Traditional standing is not proof that a herb works or that it is safe. Kampo tradition used this formula for cold limbs and fluid build-up; modern human evidence is thin.

How does Shinbuto work?

The harm comes from aconitine-type alkaloids in the aconite root. In laboratory studies, these alkaloids hold open voltage-gated sodium channels. Those channels are the tiny gates that make nerve and heart cells fire.

When the gates stay open, cells fire again and again. Reports of human poisoning match this picture. People describe tingling, numbness, vomiting and fast or chaotic heart rhythms.

The heart rhythm problem is the part that kills. It can begin within minutes to a few hours. Deaths have been reported in people who took aconite outside medical care.

In Kampo theory, the formula was said to warm the body and move excess water. Other herbs in the mix were held to support that action. This is a traditional model, not a measured mechanism.

Processing lowers, but does not remove, the alkaloid load. That is why the ingredient is still handled as a regulated poison. It is also why supervised dispensing matters so much.

What forms does Shinbuto come in?

Shinbuto is sold in Japan as a licensed prescription extract. It is most often a dried granule or a fine powder in sachets.

Some makers supply tablets or capsules of the same extract. Hospital pharmacies may also hold the raw crude drugs.

Online sellers outside Japan offer look-alike products. These are not under the same checks, and the aconite content may be unknown.

No form of this page tells you how to make or take any of them. Aconite products are not a self-care item in any form.

Where it comes from:

Shinbuto came from the Shang Han Lun, a Chinese medical text from around 200 CE. Its Chinese name is Zhenwu Tang, the True Warrior Decoction.

Classical writers placed it in a group of warming formulas. They used it when a person was thought to be cold inside, with water pooling in the body. Signs named in the old texts included cold limbs, loose stools, swelling and dizziness.

The formula travelled to Japan and became part of Kampo practice. It was later approved as a prescription product under Japanese rules. Practitioners chose it on a pattern, not on a Western diagnosis.

Long use tells us the formula was valued. It does not tell us that it is safe to take on your own.

What does Shinbuto help with?

• Cold limbs with fluid build-up: Kampo texts used this formula for people judged to be cold inside with water held in the body. Signs included cold hands and feet, puffiness and a heavy feeling. This is a traditional pattern, not a test result. Good human trials for this use are lacking.
• Dizziness and unsteady standing: Classical writers linked dizziness to water held in the body and treated it with this formula. Some Japanese case reports describe use in older adults with vertigo. Case reports cannot show that a medicine works. Controlled human trials are few and small.
• Long-standing watery diarrhoea: The old texts used the formula for loose, watery stools with cold limbs. Modern use in Japan is by prescription and is chosen on the whole picture. There is no strong trial evidence for this use. Ongoing diarrhoea needs a medical cause check first.
• Swelling of the legs or face: Tradition treated oedema (fluid swelling) linked to a cold pattern with this formula. Swelling can also signal heart, kidney or liver disease. Those causes need proper testing. Self-treating swelling with an aconite formula is dangerous.
• Cold, tired states with a weak pulse: Kampo practice used warming formulas for people who felt cold, drained and slow. Shinbuto sat in that group. Evidence in people is limited to tradition and small reports. Fatigue has many treatable causes worth checking.

What are the side effects of Shinbuto?

• Tingling or numbness of the lips, tongue, mouth or face
• Pins and needles in the hands and feet
• Nausea, vomiting or stomach pain
• A fast, slow or irregular heartbeat
• Pounding in the chest or a fluttering feeling
• Dizziness, weakness or fainting
• Low blood pressure with cold, clammy skin
• Muscle weakness that spreads
• Trouble breathing
• Fits (seizures)
• Heart rhythm collapse and death

Good to know:

These are not mild side effects. Aconite poisoning can begin within minutes to a few hours.

Tingling around the mouth is a classic early sign. It can be followed fast by heart rhythm trouble.

Deaths have been reported after aconite use, including with herbal products. Treat any of these signs as an emergency.

How much Shinbuto should you take?

• Recommended daily: This page gives no dose, and that is on purpose. Shinbuto contains processed aconite root, a regulated poison. The safe amount and the harmful amount sit very close together. Batch strength varies with the plant and the processing. There is no amount we can print that would be safe for a reader to act on. In Japan, a doctor sets the amount, and a pharmacist dispenses it. If you have been prescribed it, follow that prescription only.
• Best time of day: Not applicable. Timing forms part of a prescription and is not a self-care choice for a medicine that contains aconite.
• With or without food: Not applicable. Any instruction of this kind belongs with the dispensing pharmacist, not on a public page.
• Time to effect: Not applicable. We give no timeline, because doing so would invite people to keep taking it while waiting for a result.
• How long to take it: Not applicable. Length of use is a prescribing decision made by the doctor who is watching you. This page will not suggest a number of days or weeks.