Educational information, not medical advice — ask your doctor or midwife.
Da Jian Zhong Tang is a classical Chinese herbal formula with just four parts. Those parts are Sichuan pepper husk, dried ginger, ginseng and maltose (malt sugar). People take it as a warm drink or as granules.
It is used for cramping belly pain with a cold, bloated, sluggish gut. In Japan the same formula is called daikenchuto. Hospitals there give it, mostly around bowel surgery.
This library treats it as a single drug (TCM formula). Other names are Major Construct the Middle Decoction, daikenchuto and TJ-100.
Where does the evidence stand? It is one of the better-studied East Asian formulas. There are real randomised trials in people recovering from bowel surgery.
But the results are mixed. It is not proven to treat any disease. We found no PMID (a study ID number) for these trials, so none is cited here.
Long use tells you a formula has been valued for centuries. It does not prove the formula works. That point applies to everything below.
The most likely reason is a simple one. It may speed up and settle the movement of the gut wall. Trapped gas and stool then move along instead of building up.
Lab and animal work points to a few possible routes. The sharp compounds in Sichuan pepper and dried ginger seem to act on nerve endings in the gut lining.
That may raise blood flow to the bowel. It may also trigger gut hormones that drive normal muscle waves.
Some studies also hint at a mild calming effect on swelling in the bowel wall. All of this is a likely story, not a settled one. None of it is confirmed as the reason people feel better.
You will usually meet it in one of three forms.
First, a dried granule or powder, sold as daikenchuto or TJ-100. You stir it into hot water. This is the form used in Japanese hospitals and in nearly all of the research.
Second, a traditional decoction. A practitioner boils the raw herbs and stirs the maltose in at the end.
Third, some suppliers sell capsules or tablets. These were not what the trials tested.
The formula comes from the Jin Gui Yao Lue. In English that is Essential Prescriptions of the Golden Cabinet. It is credited to Zhang Zhongjing, around the second or third century CE.
The old text describes severe cold-type belly pain. The pain is so strong that the gut can be seen moving under the skin. Vomiting and being unable to eat come with it.
It has stayed in use in Chinese medicine ever since. Japanese Kampo practice took it up centuries ago and made it a standard granule. That is how it reached modern hospitals and modern trials.
See a doctor promptly if your belly pain becomes severe, constant or comes with vomiting, fever, a hard swollen belly or no wind or stool passing at all. Those signs can mean a blocked bowel, which is a medical emergency.
Also book a check if you notice yellowing of the skin or eyes, dark urine or deep tiredness, which can point to liver trouble, or a new dry cough with breathlessness.
See your doctor if you have blood in your stool, unexplained weight loss, or gut symptoms that keep changing over weeks. And tell your pharmacist you are taking it if you are on warfarin, diabetes medicine, thyroid tablets or heart medicines.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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