Maobushisaishinto

What is Maobushisaishinto?

Maobushisaishinto is a prescription Kampo medicine built from three dangerous plants. One of them, processed aconite root (bushi), can kill by throwing the heart out of rhythm. It is not a self-care herb, and nothing on this page tells you how to take it.

The other two plants add their own harm. Ephedra (mao) acts on the body like a stress hormone, so it lifts heart rate and blood pressure. Asarum (saishin) comes from the birthwort family, a group tied to kidney damage and urinary cancer.

In Japan this formula is sold as Tsumura 127. A doctor prescribes it and a pharmacist hands it over. That control exists because the margin for error is small.

The evidence verdict is simple. Human trial support is thin and small, while the safety record holds real deaths from aconite. Long use in East Asia shows tradition, not proof of safety or benefit.

How does Maobushisaishinto work?

The three plants act in different ways, and each one carries its own route to harm.

Aconite holds alkaloids that hold open sodium channels in nerve and heart cells. Lab work and human poisoning reports both show this can set off deadly heart rhythms. The gap between a small effect and poisoning is very narrow.

Ephedra supplies ephedrine and pseudoephedrine. These are sympathomimetics, meaning they copy the body's own stress signals.

In people they raise pulse, blood pressure and alertness, and they shrink swollen nasal tissue. That is an established human effect, not a lab guess.

Asarum holds a volatile oil rich in safrole. In animal studies safrole caused liver tumours. Its plant family also holds aristolochic acid, which damages human kidneys and raises bladder cancer risk.

Japanese rules limit which part of the asarum plant may be used. That lowers, but does not erase, the concern about the wider plant family.

How the formula was meant to work in tradition is different again. It was described as warming a person whose body felt cold and weak. That idea has not been tested in the way a modern drug is tested.

What forms does Maobushisaishinto come in?

In Japan the usual form is a dry granule or powder in single sachets, made to a set standard. Tablets and capsules also exist. All of these are prescription items.

Licensed pharmacies in Japan may also hold the raw plants for a doctor's order. Those raw plants include aconite root, which is the main reason for tight control.

Online sellers offer look-alike powders, teas and capsules outside any medical system. These have no reliable check on aconite content. Avoid them.

This page gives no method for making, treating or measuring any of these forms.

Where it comes from:

This formula comes from the Shang Han Lun, a Chinese medical text from about 200 CE. There it was called ma huang fu zi xi xin tang. Later Japanese Kampo doctors kept it in use and gave it the name used here.

Classical writers used it for a person who felt deeply cold and drained at the start of an illness. They described chills, a weak pulse and low energy. It was seen as a short, sharp intervention, not a daily tonic.

Older texts were clear that aconite was risky. Practitioners treated it as a herb for trained hands only.

That long record shows standing inside a tradition. It does not mean the formula is safe to try on your own.

What does Maobushisaishinto help with?

• Early colds with strong chills: Classical Kampo doctors used it when a person felt very cold, tired and heavy at the start of an illness. Modern trial support for this use is thin. No good study shows it shortens a cold.
• Blocked or runny nose from allergy: Some small Japanese studies report less nasal blockage with this formula. The studies are small and poorly controlled. Part of any effect may simply come from the ephedra, which shrinks nasal tissue much as a decongestant does.
• Nerve pain felt as cold: Tradition used it for pain that eased with warmth. Human evidence here is limited to case reports and small series. That is not enough to judge benefit.
• Low energy with cold hands and feet: Older texts used it for frail, chilled patients. Frail older adults are also the group most at risk from aconite and ephedra. No trial supports this use in that group.

What are the side effects of Maobushisaishinto?

• Tingling or numbness of the lips, tongue or face, an early sign of aconite poisoning
• Burning in the mouth and throat
• Nausea and vomiting
• Pounding, racing or uneven heartbeat
• Chest pain
• Fainting or near-fainting
• Very high blood pressure
• Trouble sleeping, shaking, sweating and feeling on edge
• Trouble passing urine
• Muscle weakness
• Kidney damage, which can be silent at first
• Liver injury
• Lung inflammation, with cough and breathlessness

Good to know:

Harm from this formula can be fast and severe. Aconite poisoning may start within minutes to an hour, often with tingling lips. From there it can move to a fatal heart rhythm.

Ephedra harm can also come on quickly, as a racing heart or a blood pressure spike. Kidney harm from the birthwort family works the other way. It builds quietly and may only show up much later.

Is Maobushisaishinto legal where you live?

In Japan, Maobushisaishinto (Tsumura 127) is an approved prescription Kampo medicine, dispensed by a doctor or pharmacist under the national health system; lower-strength versions are sold over the counter there. In the United States, the FDA banned ephedra alkaloids in dietary supplements in 2004, and ephedrine is a DEA List I regulated precursor. In the United Kingdom and the European Union, aconite is not allowed in unlicensed herbal products, and birthwort family herbs holding aristolochic acid are banned.

Options to discuss with a clinician

Talk to a doctor or pharmacist before you try anything on this list. The point is to treat the symptom without aconite or ephedra.

For a blocked or runny nose from allergy, ask about saline rinses, steroid nasal sprays or non-drowsy antihistamines (allergy tablets). These are well studied and come with clear labels.

For a common cold, rest, fluids and simple pain relief remain the sensible base. Ask a pharmacist which pain relief suits you.

For cold-type nerve pain, ask your doctor about a proper work-up first. Warmth, movement and licensed pain treatments can then be matched to the cause.

If you want to stay within Kampo, ask a licensed Kampo doctor about formulas that hold neither aconite nor ephedra. Bring your full drug list to that visit.