What Ma Xing Shi Gan Tang is for
Hot, red and congested skin whose eruption will not vent: the lesions stay locked in, the surface is hot to the touch, and the picture is one of Heat trapped inside. The explanation is Heat in the Lungs closing the Qi, and the formula opens the Lungs while clearing the Heat so the eruption can come out. It suits the early hot stage only.
The eruption is hot and red, and it is not moving. Spots sit where they are, the skin around them is hot to the touch, and the surface looks congested rather than dry. In the picture the tradition describes, the rash is not venting: the Heat behind it has gone inward into the Lungs, and the surface cannot release what is being pushed toward it. The early hot stage is the one this formula suits, where the eruption is fresh and the skin is hot; a rash with breathlessness is a different matter and needs urgent assessment.
The formula works by proportion. Ma Huang opens the Lungs and releases the surface, so the congested Qi can move and the eruption has a way out; Shi Gao is given in a much larger dose, so that the cooling outweighs the warming and the net effect is cold; Xing Ren brings the Lung Qi down; Gan Cao harmonises. The ratio is the formula: reduce the mineral and it becomes a warming release, which is the opposite of what this picture needs.
It is used for three to seven days in the acute stage and reassessed as the eruption changes, then stopped rather than continued. Wind-Cold patterns without Heat are excluded, and so are deficiency patterns. Ma Huang is a strong herb and requires professional supervision, and a child with a febrile rash and breathing difficulty needs urgent medical care rather than a formula.
Actions
- Clears Heat from the Lungs
- Opens and descends the Lung Qi
- Relieves breathlessness and cough
- Vents rashes that are not resolving
Properties
- Taste and temperature: Predominantly pungent and sweet with a cold quality. Pungent opens the Lungs, sweet and cold clear the Heat.
- Organs: Lungs, Stomach
- Channels: Lung, Stomach
The pattern behind it
The pattern is Heat congesting the Lungs with the Qi unable to descend. The Heat produces the fever and the thirst, while the closed Qi produces the breathlessness and the cough. The formula opens the Lungs and clears the Heat, which is why it is used when both appear together.
Composition
The herbs in Ma Xing Shi Gan Tang, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Deputy | Ma Huang | 6 to 9 g | Warm, Pungent, bitter | Opens the Lungs and releases the surface, allowing the congested Qi to move. |
| Assistant | Shi Gao | 18 to 30 g | Cold, Sweet, pungent | Clears the Heat in a dose large enough to outweigh the warming herb. |
| Envoy | Xing Ren | 6 to 9 g | Slightly warm, Bitter, sweet | Descends the Lung Qi and relieves the cough and breathlessness. |
| Gan Cao | 3 to 6 g | Neutral, Sweet | Harmonises the formula and protects the middle. |
Patterns it treats
Lung Heat
A hot, red eruption that will not vent, with the lesions locked in place and the surface hot to the touch. Heat in the Lungs has closed the Qi, so the skin cannot release what is being pushed toward it.
How the formula is built
The formula works by proportion. Ma Huang opens the Lungs, but Shi Gao is given in a much larger dose so that the overall effect is cooling rather than warming. Xing Ren brings the Qi down, and Gan Cao holds it together. Change the ratio and it becomes a different formula.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Decocted in water and taken warm, in two divided doses.
Modifications
- If the Heat is very marked, Shi Gao is increased.
- If the breathlessness dominates, the opening herbs are adjusted.
- If Phlegm is present, Phlegm-transforming herbs are added.
- If the pattern is cold, this formula is not used.
Timing
Taken warm in two divided doses.
Duration
Acute use: three to seven days, reassessed as symptoms improve.
Diet while taking it
Cool fluids in small sips; light food during recovery.
Safety
Contraindications
Avoid in Wind-Cold patterns without Heat, and in deficiency patterns. Ma Huang is a strong herb and requires professional supervision.
Interactions
Ma Huang interacts with cardiac and blood-pressure medication and stimulants. This formula requires a practitioner.
Pregnancy
Use with caution in pregnancy because Ma Huang is a strong opening herb and the formula is used in acute respiratory illness.
Breastfeeding
Use only under professional guidance.
Children
Used only with professional supervision; a child with a febrile rash and breathlessness needs urgent medical care.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription. Breathlessness with fever is a medical emergency, especially in children.
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.
Selected PubMed records
Real PubMed records for the modern, non-TCM discussion of this formula. They are references, not a claim that the formula is proven for any skin condition.
- The TCM prescription Ma-xing-shi-gan-tang inhibits Streptococcus pneumoniae pathogenesis by targeting pneumolysin.. Journal of ethnopharmacology, 2021. PMID: 33892068.
- Chromatographic isolation of nanoparticles from Ma-Xing-Shi-Gan-Tang decoction and their characterization.. Journal of ethnopharmacology, 2014. PMID: 24384378.
Origin and history
Shang Han Lun (伤寒论, Treatise on Cold Damage) by Zhang Zhongjing, Eastern Han dynasty, around 220 CE.
The formula appears in the Treatise on Cold Damage and is one of the earliest treatments for Heat trapped in the Lungs. Its logic of outweighing a warming herb with a larger dose of a cooling one is a classic example of how proportion creates function in a formula.
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
Why does it contain a warming herb?
Ma Huang opens the Lungs, which is needed when the Qi is closed. It is outweighed by a much larger dose of a cold mineral, so the net effect is cooling.
Can it be used for a child with chickenpox?
Only under medical supervision. A febrile rash with breathlessness in a child is a medical emergency.
Is Ma Huang safe?
It is a strong herb that interacts with cardiac and blood-pressure medication, so the formula needs a practitioner.
How long is it used?
Three to seven days, reassessed as symptoms improve.