What Xiao Huo Luo Dan is for
The skin and the limb beneath it are numb, cold and stiff. Feeling is dulled over the area, the tissue may feel thickened or bound down, and movement is reluctant. The pain that is present is fixed rather than wandering, and it is worse in cold weather. The explanation is Cold-Dampness with Phlegm settled in the small collaterals, the deepest and most fixed form of obstruction, and the formula is small, warm and concentrated for it.
What shows at the surface is a loss of the normal qualities: the colour is dull or dusky, the area feels cooler than the skin beside it, and the tissue does not move freely under the finger. Where the tissue has thickened, the surface can look smooth and shiny because it can no longer wrinkle. Numbness and coldness arriving together are the key, and neither yields to ordinary warming or rest.
Zhi Chuan Wu and Zhi Cao Wu are prepared aconites that warm and open the collaterals strongly, and they are the reason the formula acts quickly. Tian Nan Xing transforms the Phlegm that has settled within the obstruction, Di Long reaches the finest vessels where the blockage sits, and Ru Xiang with Mo Yao move Blood and relieve the fixed pain. It is warming, moving and Phlegm-transforming at once, which suits tissue that is cold, thick and numb rather than red.
The aconites are toxic unless correctly prepared, so this is a short supervised course rather than a long one, and it is contraindicated in pregnancy. Hot, red or acutely inflamed skin is the opposite indication. Numbness that is new, one-sided or spreading, or weakness that comes on suddenly, needs urgent medical assessment, because it may not be a pattern that warming herbs can address.
Actions
- Warms the channels and dispels Cold-Dampness
- Transforms Phlegm and unblocks the collaterals
- Moves Blood and relieves pain
- Improves numbness and stiffness
Properties
- Taste and temperature: Predominantly pungent, bitter and hot. Pungent and hot warm and unblock, bitter dries and transforms Phlegm.
- Organs: Liver, Spleen, Kidney
- Channels: Liver, Spleen
The pattern behind it
The pattern is Cold-Dampness with Phlegm obstructing the collaterals. The Cold produces the stiffness and the worsening in cold weather, the Dampness and Phlegm produce the heaviness and the thickening, and the obstruction produces the numbness. The formula warms, transforms and unblocks, which is why it is used for chronic cold obstruction rather than acute inflammation.
Composition
The herbs in Xiao Huo Luo Dan, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Zhi Chuan Wu | 3 to 6 g | Hot, Pungent, bitter | A prepared aconite that warms and unblocks the collaterals strongly; toxic without correct processing. | |
| Deputy | Zhi Cao Wu | 3 to 6 g | Hot, Pungent, bitter | The second prepared aconite, adding strong warming and pain relief to the unblocking action. |
| King | Tian Nan Xing | 3 to 6 g | Warm, Bitter, pungent | Transforms Phlegm and dispels Wind, addressing the Phlegm component of the obstruction. |
| King | Di Long | 3 to 6 g | Cold, Salty | Reaches and unblocks the fine collaterals, which is where this obstruction sits. |
| Ru Xiang | 2 to 3 g | Warm, Pungent, bitter | Moves Blood and relieves pain, supporting the unblocking. | |
| Mo Yao | 2 to 3 g | Neutral, Bitter, pungent | Moves Blood and relieves pain, working with Ru Xiang. |
Patterns it treats
Painful Obstruction with Wind-Cold-Damp
Numb, cold, stiff skin and tissue that may feel thickened or bound down, with a fixed pain worse in cold weather. Cold-Dampness and Phlegm have settled in the small collaterals, so feeling and movement are lost at the surface while the area stays cool and dusky.
How the formula is built
Two strong warming aconites open the collaterals, one herb transforms the Phlegm that has settled there, one reaches the finest vessels, and two move Blood and relieve pain. It is a concentrated formula for a fixed obstruction, which is why it acts quickly and is used only in short courses.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Taken as prepared pills, traditionally with warm wine, under professional supervision.
Modifications
- If Cold is marked, warming herbs and moxibustion are added.
- If Phlegm dominates, Phlegm-transforming herbs are increased.
- If the person is depleted, tonic support is added and the course shortened.
- For hot red conditions, the formula is not used.
Timing
Taken with warm wine traditionally, under supervision.
Duration
Short courses of one to two weeks, reassessed, and not intended for prolonged continuous use.
Diet while taking it
Avoid cold and raw food; keep warm.
Safety
Contraindications
Contraindicated in pregnancy. Avoid in hot, red or acute conditions. Used only in short courses because the aconites are toxic.
Interactions
The aconites can affect heart rhythm and interact with cardiac medication, and they are toxic without correct preparation. This formula requires a practitioner.
Pregnancy
Contraindicated. Zhi Chuan Wu and Zhi Cao Wu are the principal concerns and are prohibited in pregnancy.
Breastfeeding
Contraindicated without specialist guidance.
Children
Used only with professional supervision.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription. The aconites make this a professional-only formula, and sudden numbness or weakness needs urgent medical 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
Tai Ping Hui Min He Ji Ju Fang (太平惠民和剂局方, Formulas from the Imperial Pharmacy), Song dynasty, 12th century.
The formula comes from the Song imperial formulary, where it treated chronic obstruction that had settled into the small collaterals. Its use of two prepared aconites reflects the seriousness of that obstruction, and the toxicity of those herbs is why it has always been a supervised, short-course prescription.
Classical record
The Song imperial formulary records the elixir for chronic Wind-Cold-Dampness obstruction with numbness and fixed pain, using prepared aconites to unblock the collaterals.
Tai Ping Hui Min He Ji Ju Fang (太平惠民和剂局方, Formulas from the Imperial Pharmacy), 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
Is it safe to take at home?
No. It contains two prepared aconites, which are toxic unless correctly processed and dosed, so it requires a qualified practitioner.
What does it treat?
Chronic cold obstruction with numbness, stiffness and fixed pain that has settled in the small collaterals.
How is it different from Juan Bi Tang?
Juan Bi Tang is gentler and tonifies. This formula is stronger and contains aconites, for obstruction that has not responded to gentler treatment.
How long is it used?
One to two weeks at a time, with reassessment, because of the aconites.