Shi Zao Tang

What is Shi Zao Tang?

Shi Zao Tang, also called Ten-Jujube Decoction, is a classical Chinese herbal formula. It was written down for people with fluid built up around the lungs or in the belly. It is a single named formula, not one herb, and it is one of the harshest purges in Chinese medicine.

Three of its four ingredients are poisonous plant parts: Gan Sui root, Da Ji root and Yuan Hua flower bud. They are ground to powder and washed down with a sweet soup made from ten jujube dates. The dates are there to soften the damage, not to treat the illness.

It has a long record in Chinese medicine, but long use is not proof that a remedy works. We could not find any controlled human trial of this formula. It is a high-risk preparation that should never be self-prescribed.

How does Shi Zao Tang work?

The three toxic herbs are strong irritants to the gut. They pull large amounts of water into the bowel, so you pass watery stools and more urine. Classical doctors used that flood of fluid to drain water trapped in the chest or belly.

In lab work these plants contain diterpene esters, a group of harsh plant chemicals. They inflame the lining of the gut and can burn skin and eyes. That irritation, not a gentle balancing action, is what drives the effect.

This is a reasonable account, not a proven one. No modern study has shown that the formula clears fluid in people better than standard care.

What forms does Shi Zao Tang come in?

Traditionally the three toxic herbs are dried, processed with vinegar, ground to a fine powder, and taken with a warm soup made by boiling ten jujube dates.

Modern Chinese pharmacies may sell it as a powder or as granules. It is not sold as a routine over-the-counter supplement in most Western countries, and imports are restricted in some.

Any product sold online under this name should be treated as unsafe unless a qualified practitioner has chosen it for you and is watching you closely.

Where it comes from:

Shi Zao Tang appears in the Shang Han Lun and Jin Gui Yao Lue, medical texts credited to Zhang Zhongjing around 200 CE. It was prescribed for what the texts call suspended fluid and water swelling, matching what we now call fluid around the lungs or in the belly.

It has stayed in the Chinese formula canon for about 1,800 years, but always with warnings. Classical writers described it as an attacking formula to be given briefly, to strong patients only, and stopped as soon as fluid moved.

What does Shi Zao Tang help with?

• Pleural effusion (fluid around the lungs): This is the classical target. Old texts describe cough, chest fullness and pain on breathing that eased after the formula drained fluid. Modern care for this uses imaging, drainage and treatment of the cause. We found no controlled trial comparing the formula with that care.
• Ascites (fluid in the belly): Chinese case reports describe use alongside hospital care in liver and cancer patients. Reports like these cannot show whether the formula helped, because there is no comparison group. Ascites usually signals serious liver, heart or cancer disease. It needs a doctor, not a home remedy.
• Severe general edema (whole-body swelling from fluid): Tradition uses the formula to force fluid out fast when swelling is heavy and the person is otherwise strong. There is no human trial evidence for this use. The same fluid loss that reduces swelling can also cause dangerous dehydration.
• Stubborn constipation with fluid build-up: The formula is a powerful purge, so stools do move. That is a known chemical effect, not proof of benefit. Safer laxatives exist for simple constipation, and no one should use this formula for that reason.

What are the side effects of Shi Zao Tang?

• Heavy watery diarrhoea
• Stomach cramps and pain
• Nausea and vomiting
• Dehydration (losing too much body water)
• Low potassium and other body salt loss, which can disturb heart rhythm
• Weakness, dizziness and fainting
• Kidney injury after heavy fluid loss
• Mouth and throat burning from the raw powders
• Miscarriage or harm to a pregnancy

Good to know:

Purging, cramping and fluid loss are not rare side effects here. They are the expected action of the formula, which is why it is high-risk.

The serious problems come from that fluid loss going too far: collapse of blood pressure, disturbed heart rhythm and kidney damage. Poisoning cases and deaths have been reported with the individual herbs Gan Sui and Yuan Hua.

The irritant chemicals in these plants have also promoted tumour growth in animal studies. This is another reason the formula is not suitable for casual or repeated use.

Options to discuss with a clinician

Better-studied routes exist for each of these problems, and every one of them belongs in a conversation with a doctor, pharmacist or qualified herbalist rather than being picked up alone.

**Fluid in the belly, around the lungs, or whole-body swelling.** Ascites (fluid in the abdomen), pleural effusion (fluid around the lungs) and widespread oedema (swelling from retained fluid) are signs of something going wrong in the liver, heart or kidneys. These are diagnosed and monitored conditions — the route here is urgent medical assessment, imaging and blood tests, with drainage or prescribed diuretics ("water tablets") managed by a clinician who can watch your potassium and kidney function. No herb substitutes for that, and self-treating can mask a deteriorating illness.

**Stubborn constipation.** Worth asking a doctor or pharmacist first why it is happening — medicines, thyroid problems and bowel disease all cause it. Among options you could raise with them are Psyllium Husk, Supplemental fiber, Inulin, Magnesium and Probiotics, alongside fluid intake, movement and review of any drugs that slow the gut. If you have heart, kidney or liver disease, some of these are not appropriate, which is exactly why the conversation comes first.

Graded pages for the options named above:

• Supplemental fiber — evidence grade A, traditional tier T0
• Psyllium Husk — evidence grade A, traditional tier T3
• Probiotics — evidence grade A, traditional tier T0
• Magnesium — evidence grade A, traditional tier T0
• Potassium — evidence grade A, traditional tier T0
• Inulin — evidence grade A, traditional tier T0