What Dao Chi San is for
The name means guiding out the red, and on the skin that red is the whole point: flushed, angry patches that feel hot under the hand and brighten when the person is overwrought. Nothing here suppresses the colour. The method is to cool the Blood beneath it, keep the surface from drying out, and let the Heat leave the way it came.
The skin shows flat or slightly raised red patches, warm and dry rather than weeping, most often across the face, chest and upper back. They brighten rather than fade when the person is agitated, and the colour is even across each patch with the surface intact. That dryness is what separates the picture from a wet, oozing Damp-Heat eruption. The redness has a thin quality, as though the heat sits just under a surface that has not yet thickened.
Sheng Di Huang cools the Blood and nourishes Yin, so the redness loses the heat that feeds it without the surface being left parched. Mu Tong drains Heart Heat downward and out, which is the formula's signature move: the colour is guided away rather than pressed back into the tissue. Zhu Ye clears the same Heat more gently, and Gan Cao harmonises the small group so the cooling does not sit heavily.
It suits an acute red flare where the skin is hot but intact, and it is too cooling and too narrow for cold, pale or weeping skin. Mu Tong must come from the safe species, and the course is short because the target is a passing flare rather than a settled pattern. Where redness persists for weeks, or the surface breaks down, the picture has moved and a different approach is needed.
Actions
- Clears Heart Heat
- Guides Heat out through the urine
- Cools the Blood
- Relieves mouth ulcers and restlessness
Properties
- Taste and temperature: Predominantly sweet and bitter with a cold quality. Sweet protects the middle, bitter and cold clear Heat and drain downward.
- Organs: Heart, Small Intestine, Bladder
- Channels: Heart, Small Intestine
The pattern behind it
The pattern is Heart Heat, which rises to the mouth and disturbs the spirit. The Heat produces the ulcers, the red tongue tip and the restlessness, and because the Heart pairs with the Small Intestine the treatment can drain it downward through the urine.
Composition
The herbs in Dao Chi San, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Sheng Di Huang | 15 to 30 g | Cold, Sweet, bitter | Cools the Blood and nourishes Yin, addressing the Heat at its root. | |
| Mu Tong | 3 to 6 g | Cold, Bitter | Drains Heart Heat through the urine. Only the safe species is used; Guan Mu Tong is banned. | |
| Zhu Ye | 3 to 6 g | Cold, Sweet, bitter | Clears Heart Heat and settles restlessness without drying. | |
| Gan Cao | 3 to 6 g | Neutral, Sweet | Harmonises the formula and protects the middle. |
Patterns it treats
Heart Fire
Flushed, angry red patches that are warm and dry, brightening when the person is overwrought. The colour sits in the Heart channel and rises to the surface, which is why the redness is even, the surface intact and the effect of cooling so direct.
How the formula is built
One herb cools the Blood, one drains the Heat out, one settles the spirit and one harmonises. The formula is small because its target is narrow: Heat in the Heart channel, which shows on the tongue and in the urine.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Taken as a powder in warm water, or decocted, in two divided doses.
Modifications
- If the Heat is marked, more cooling herbs are added.
- If the ulcers are painful, herbs that relieve pain are added.
- If the person is depleted, the cooling is reduced.
- If Dampness is present, draining herbs are added.
Timing
Taken in two divided doses.
Duration
Short course, typically three to seven days, reassessed.
Diet while taking it
Avoid hot spicy and fried food, and alcohol, which add to Heat.
Safety
Contraindications
Avoid in cold or deficient patterns and in Dampness without heat. Mu Tong must be from the approved species, because Guan Mu Tong is banned for kidney toxicity.
Interactions
The draining herb can add to diuretic medication. Gan Cao can interact with diuretics, digoxin and corticosteroids.
Pregnancy
Use with caution in pregnancy because Mu Tong promotes urination and moves Blood.
Breastfeeding
Use only under professional guidance.
Children
Frequently used in children with reduced dose for mouth ulcers and irritability with heat.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and persistent mouth ulcers need medical or dental assessment.
General safety references
General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this formula.
- Review article: Herbal hepatotoxicity - an update on traditional Chinese medicine preparations. Alimentary Pharmacology & Therapeutics, 2014. PMID: 24844799.
- Interactions between herbal medicines and prescribed drugs: an updated systematic review. Drugs, 2009. PMID: 19719333.
- Warfarin and food, herbal or dietary supplement interactions: a systematic review. British Journal of Clinical Pharmacology, 2021. PMID: 32478963.
Origin and history
Xiao Er Yao Zheng Zhi Jue (小儿药证直诀, Key to Therapeutics of Children's Diseases) by Qian Yi, Song dynasty, around 1119 CE.
Qian Yi wrote the formula for children with Heart Heat, a common presentation of mouth ulcers and restlessness. Its method of draining Heart Heat through the urine is a distinctive idea in the tradition, and the tongue tip remains its most useful diagnostic clue.
Classical record
Qian Yi recorded the powder for Heart Heat in children with mouth ulcers, restlessness and dark urine, guiding the Heat out through the urine.
Xiao Er Yao Zheng Zhi Jue (小儿药证直诀, Key to Therapeutics of Children's Diseases), Qian Yi, Song dynasty.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
What is the key sign?
A red tongue tip with mouth ulcers and restlessness. That points to the Heart channel.
How is it different from Qing Wei San?
Qing Wei San clears Stomach Fire for the face and gums. Dao Chi San clears Heart Heat for the tongue and urine.
Is Mu Tong safe?
Only the approved species is used. Guan Mu Tong is banned because of kidney toxicity.
How long is it used?
Three to seven days, then reassessed.