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Nijutsuto

Traditionally used for: Shoulder pain and stiffness that feels worse in cold, damp weather. Frozen shoulder (a shoulder that is stiff and painful to move).

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What is Nijutsuto? Nijutsuto is a Kampo herbal formula from Japan. Nijutsuto is its Japanese romanised name, written 二朮湯. People take it for shoulder pain and for a stiff shoulder that is hard to lift or turn. It sits on Japan's list of 148 Kampo formulas approved by the health ministry (MHLW) for national health insurance. A Japanese doctor can prescribe it. Elsewhere it is sold as granules or tablets. It has been used this way for a long time. Long use is not proof that a medicine works. Human trials of Nijutsuto are few and small, so the honest answer is that we do not know how well it works. How does Nijutsuto work? No one has shown how Nijutsuto works in the body. What follows is the idea behind it, not proof. In Kampo, this kind of shoulder pain is seen as 'dampness' and stuck flow in the joint. The formula is meant to dry that dampness, move fluid and warm the area so the pain lets go. In modern terms, lab work on single herbs in it points to effects on swelling and muscle tone. Those are test-tube and animal findings. They do not tell you what happens in a person's shoulder. What forms does Nijutsuto come in? The usual form is a dried water extract turned into granules, packed in 2.5 g sachets. You stir a sachet into hot water and drink it. Some makers press the same extract into tablets or fill it into capsules. These suit people who dislike the taste. A few Kampo practitioners still boil the raw herbs into a tea. This is less common and the strength is harder to judge. Where it comes from: Nijutsuto first appears in a Chinese medical text of the Ming era, Wanbing Huichun (1587), known in Japan as Bankyo Kaishun. Japanese Kampo doctors took it up and kept it for one main job: painful, stiff shoulders. It is still used that way today and is covered by Japanese national health insurance.

Helps

What does Nijutsuto help with? Frozen shoulder (a shoulder that is stiff and painful to move): This is the main use, and Japanese doctors prescribe it for exactly this. The evidence is mostly doctors' reports and small case series, not good trials. It is often used alongside physiotherapy (guided exercises), not instead of it. Shoulder pain in people aged 40 to 60: Kampo texts tie this formula to the shoulder pain that shows up in middle age. Tradition backs it well. Controlled human evidence is thin, so treat any benefit as unproven. Stiff, aching neck and upper back: Prescribers sometimes widen its use to neck and upper back stiffness that goes with the shoulder problem. This is an extension of traditional practice. We found no trial testing it for this. Shoulder pain that is worse in damp or cold weather: In Kampo this pattern is called 'dampness', and it is the pattern the formula is chosen for. Practitioners say it fits best here. There is no trial evidence comparing it with other formulas. Shoulder pain with a heavy or numb feeling in the arm: Traditional use includes a heavy arm and mild numbness along with the pain. New or spreading numbness needs a doctor first, because it can point to a nerve problem. Evidence for the formula here is traditional only.

Nijutsuto

Quick Facts

  • What it is: Nijutsuto is a Japanese Kampo herbal formula, on the health ministry's list of 148 insured formulas, used mainly for a stiff and painful shoulder.
  • Main uses: Frozen shoulder (a shoulder that is stiff and painful to move), Shoulder pain in middle age, Stiff neck and upper back
  • Best for: Shoulder pain and stiffness that feels worse in cold, damp weather
  • Active ingredients: Atractylodes lancea root (sojutsu), Atractylodes macrocephala root (byakujutsu), Pinellia tuber (hange), Poria (bukuryo), Citrus peel (chinpi), Cyperus root (kobushi), Clematis root (ireisen), Scutellaria root (ougon), Arisaema tuber (tennansho), Ginger (shokyo), Licorice root (kanzo), which holds glycyrrhizin
  • Forms: Granule sachets (2.5 g), Tablets, Capsules, Boiled herb tea
  • Time to effect: Some people feel a change in one to two weeks; judge the result at about four weeks.
  • Side effects: Usually mild stomach upset or rash; rarely high blood pressure, low potassium, liver injury or lung inflammation.
  • Pregnancy & breastfeeding: Avoid unless your clinician advises otherwise.

Educational information, not medical advice — ask your doctor or midwife.

What is Nijutsuto?

Nijutsuto is a Kampo herbal formula from Japan. Nijutsuto is its Japanese romanised name, written 二朮湯. People take it for shoulder pain and for a stiff shoulder that is hard to lift or turn.

It sits on Japan's list of 148 Kampo formulas approved by the health ministry (MHLW) for national health insurance. A Japanese doctor can prescribe it. Elsewhere it is sold as granules or tablets.

It has been used this way for a long time. Long use is not proof that a medicine works. Human trials of Nijutsuto are few and small, so the honest answer is that we do not know how well it works.

How does Nijutsuto work?

No one has shown how Nijutsuto works in the body. What follows is the idea behind it, not proof.

In Kampo, this kind of shoulder pain is seen as 'dampness' and stuck flow in the joint. The formula is meant to dry that dampness, move fluid and warm the area so the pain lets go.

In modern terms, lab work on single herbs in it points to effects on swelling and muscle tone. Those are test-tube and animal findings. They do not tell you what happens in a person's shoulder.

What forms does Nijutsuto come in?

The usual form is a dried water extract turned into granules, packed in 2.5 g sachets. You stir a sachet into hot water and drink it.

Some makers press the same extract into tablets or fill it into capsules. These suit people who dislike the taste.

A few Kampo practitioners still boil the raw herbs into a tea. This is less common and the strength is harder to judge.

Where it comes from:

Nijutsuto first appears in a Chinese medical text of the Ming era, Wanbing Huichun (1587), known in Japan as Bankyo Kaishun.

Japanese Kampo doctors took it up and kept it for one main job: painful, stiff shoulders. It is still used that way today and is covered by Japanese national health insurance.

Who should avoid Nijutsuto?

  • Do not use if you have aldosteronism, a hormone problem that raises blood pressure and lowers potassium.
  • Do not use if you have myopathy, a muscle disease that causes weakness.
  • Do not use if a blood test has shown low potassium (hypokalaemia).
  • Do not use if you already take another licorice (kanzo) product, another Kampo formula containing it, or a glycyrrhizin injection, unless a pharmacist has added up the total dose for you.
  • Do not use if you are having interferon injections.
  • Do not use if you take digoxin or another heart rhythm medicine, unless your heart doctor has agreed.
  • Do not use if you take water tablets (diuretics) or steroid tablets, unless your doctor checks your potassium.
  • Do not use if you are pregnant, trying for a baby, or breastfeeding, unless a doctor trained in Kampo tells you to.
  • Do not use if you have liver disease, kidney disease, heart failure or high blood pressure, unless your doctor is monitoring you.
  • Do not use if you have a long-term lung disease such as COPD (a long-term lung disease that makes breathing hard) or pulmonary fibrosis (scarred lungs), unless your doctor agrees.
  • Do not use if you have ever reacted badly to any herb in the formula.
  • Do not give it to a child except under a doctor's care.

When should you see a doctor?

Stop taking it and call a doctor the same day if your ankles or face swell, you gain weight fast, your blood pressure jumps, or your muscles feel weak or cramp badly.

Get urgent care if you have a fast or uneven heartbeat, if your skin or eyes turn yellow, if your urine turns dark, or if you develop a dry cough, fever and shortness of breath.

See a doctor before you start if your shoulder pain followed an injury, if your arm is numb or weak, or if the pain wakes you every night. Those need a proper diagnosis first.

Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.

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