What is Zeng Ye Cheng Qi Tang?
Zeng Ye Cheng Qi Tang is a traditional Chinese herbal formula, also known as Increase the Fluids and Order the Qi Decoction. It is a single drug (TCM formula) — that is, one prescription made of several herbs used together, not a single plant. It is a short-term purgative, meaning it is given to force a bowel movement.
In classical practice it is used for a person with a fever who has become very dry — dry mouth, thirst, dark urine and hard, stuck stool. The idea is to moisten the body and clear the bowel at the same time. It was never meant as a daily fibre supplement or a long-term constipation remedy.
Evidence verdict: this is a long-standing formula in Chinese medicine, but we could not identify good human trials in the published English literature, so its effects beyond a laxative action are unproven. Long traditional use is not the same thing as proof that something works, and that distinction applies to everything on this page.
How does Zeng Ye Cheng Qi Tang work?
The strongest and best-understood action is simple: it makes you empty your bowels.
Two of the ingredients do that directly. Rhubarb root (Da Huang) contains anthraquinones, plant compounds that stimulate the large bowel to contract. Mirabilite (Mang Xiao) is mostly sodium sulfate, a salt that pulls water into the gut, which softens stool.
The other three herbs are described in tradition as "increasing the fluids" — moistening a dry body so the bowel can move without harsh force. That part is a traditional explanation, not a mechanism that has been measured in people. How the whole formula behaves as a combination has not been well studied.
What forms does Zeng Ye Cheng Qi Tang come in?
You will meet it in a few forms:
Traditional water decoction — the raw herbs are simmered and the liquid is drunk. Mirabilite is usually stirred in at the end rather than boiled.
Granules or powdered extract — dissolved in hot water. This is the most common modern form.
Pills or capsules of concentrated extract — less common for this formula, because dosing a purgative by pill is harder to adjust.
It is normally supplied and adjusted by a trained practitioner rather than bought off a shelf, and ingredient amounts vary between suppliers.
Where it comes from:
The formula comes from the Wen Bing Tiao Bian (Systematic Differentiation of Warm Diseases), written by Wu Ju-tong and published in 1798. That text belongs to the "warm disease" school, a branch of Chinese medicine focused on fevers and heat illness.
It was built as a gentler option than the harsher purgative formulas of the day, for patients thought to be too dried out to tolerate a strong purge alone. It has stayed in the standard Chinese formula curriculum ever since and is still taught and prescribed today.
Who should avoid Zeng Ye Cheng Qi Tang?
- Do not use if you are pregnant: rhubarb root and strong purgatives can stimulate the womb and are traditionally forbidden in pregnancy.
- Do not use if you are breastfeeding, as anthraquinone laxative compounds can pass into breast milk.
- Never give it to a child unless a qualified practitioner has prescribed it and is supervising.
- Do not use if you have, or might have, a blocked bowel (intestinal obstruction), or if you have sudden severe belly pain — go to hospital instead.
- Do not use if you have inflammatory bowel disease, such as Crohn's disease or ulcerative colitis.
- Do not use if you have long-standing diarrhoea, or if you are already dehydrated.
- Do not use if you have kidney disease, heart failure or high blood pressure needing a low-salt diet, because mirabilite adds sodium (salt).
- Do not use if you take digoxin, a water tablet (diuretic) or lithium, unless your doctor is monitoring your blood tests.
- Do not use if you have low potassium (a mineral your heart and muscles need) or another known salt imbalance.
- Do not use it as a daily or long-term laxative, and never use it for weight loss.
- Do not use if you have liver disease, as anthraquinone laxatives have occasionally been linked to liver injury.
When should you see a doctor?
See a doctor if your constipation lasts more than three days, keeps coming back, or started suddenly without a clear reason.
Get medical help the same day if you have severe belly pain, vomiting, a swollen tender belly, or you cannot pass wind as well as stool. Those can mean a blocked bowel, which a laxative can make worse.
Go to A&E or call emergency services if you have an irregular or racing heartbeat, fainting, severe muscle weakness, blood in your stool, or black tarry stool. Also see a doctor promptly if your skin or eyes turn yellow, which can be a sign of liver trouble.
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