What Wei Ling Tang is for
This is the formula for skin that is puffy, swollen or weeping, with fluid held in the tissue and the surface heavy. It drains the accumulated fluid, dries the Dampness congesting the middle, and supports the Spleen so the swelling does not simply return. It suits the damp picture with visible swelling rather than dry or inflamed skin.
The skin looks waterlogged. It is puffy and swollen, and where the surface breaks it weeps or oozes clear fluid; vesicles may form and the tissue feels heavy and boggy rather than tight and dry. Swelling can settle in the ankles and then refill, because the fluid is not being transformed. The surface is damp and heavy rather than red and hot or pale and dry.
Ze Xie, Fu Ling and Zhu Ling drain the accumulated fluid out of the tissue, opening the route by which it leaves the body. Cang Zhu, Hou Po and Chen Pi dry the Dampness congesting the middle and move the Qi, while Bai Zhu and Gan Cao support the Spleen so the fluid does not simply build up again. Gui Zhi adds warmth, because Cold slows the movement of fluids. Draining and strengthening are given together, so the puffiness settles while the system that failed to move the fluid is supported.
It is not for dry Yin or Blood deficiency, where the warm drying and draining herbs would deplete the skin further, nor for Damp-Heat without adding cooling herbs, where a yellow coat and heat signs need a cooler approach. New, one-sided or progressive swelling, or swelling with breathlessness, needs medical assessment before treatment, and the draining action is stopped once the surface settles rather than continued indefinitely.
Actions
- Dries Dampness and strengthens the Spleen
- Promotes urination and drains fluid
- Moves Qi and relieves fullness
- Warms and assists fluid transformation
Properties
- Taste and temperature: Predominantly bitter and pungent with a bland undertone. Bitter dries Dampness, pungent moves Qi and disperses stagnation, bland promotes urination.
- Organs: Spleen, Stomach, Kidney, Bladder
- Channels: Spleen, Stomach, Kidney, Bladder
The pattern behind it
The root is a Spleen that is not transforming fluids, so Dampness congests the middle and fluid accumulates in the tissues. The formula does two things at once: it drains the accumulated fluid out through the urine and it dries the Dampness that is congesting the digestion, while supporting the Spleen so the problem does not simply recur.
Composition
The herbs in Wei Ling Tang, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Cang Zhu | 6 to 10 g | Warm, Pungent, bitter | Dries Dampness strongly and supports the Spleen. | |
| King | Ze Xie | 6 to 10 g | Cold, Sweet, bland | Drains fluid out through the urine, the leading action for the accumulated water. |
| Hou Po | 6 to 10 g | Warm, Bitter, pungent | Moves Qi and dries Dampness, relieving the fullness in the middle. | |
| Fu Ling | 6 to 10 g | Neutral, Sweet, bland | Leaches Dampness out and supports the Spleen. | |
| Zhu Ling | 6 to 10 g | Neutral, Sweet, bland | A strong draining herb that promotes urination and clears fluid accumulation. | |
| Bai Zhu | 6 to 10 g | Warm, Bitter, sweet | Strengthens the Spleen so that fluids are transformed rather than accumulating. | |
| Chen Pi | 3 to 6 g | Warm, Pungent, bitter | Moves Qi and dries Dampness, easing the fullness and supporting the middle. | |
| Envoy | Gui Zhi | 3 to 5 g | Warm, Pungent, sweet | Warms the channels and helps the fluids move, addressing the cold that slows transformation. |
| Gan Cao | 3 to 5 g | Neutral, Sweet | Harmonises the formula and supports the middle. |
Patterns it treats
Damp-Phlegm
Puffy, swollen or weeping skin with fluid held in the tissue, vesicular eruptions that ooze clear fluid, and a heavy, boggy surface. The skin looks waterlogged rather than red and hot or pale and dry.
How the formula is built
The draining herbs open the urinary route, the drying and Qi-moving herbs clear the congestion in the middle, and Bai Zhu with Gan Cao support the Spleen so the fluid does not simply build up again. Gui Zhi adds warmth, because Cold slows the movement of fluids. That combination is why it is used for Dampness with visible swelling rather than for Dampness alone.
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 or three divided doses.
Modifications
- If the swelling is marked, draining herbs are increased.
- If Cold is present, warming herbs are added.
- If the digestion is very weak, the Spleen tonics are increased.
- Where Heat is present, cooling herbs must be added and the warming kept modest.
Timing
Taken warm in two or three divided doses.
Duration
Three to seven days for an acute flare of diarrhoea or oedema, and one to three weeks for subacute or recurring presentations.
Diet while taking it
Avoid cold, raw and greasy food, and reduce salt if there is swelling.
Safety
Contraindications
Avoid in Yin deficiency or Blood deficiency: the warm drying and draining herbs would deplete further. Avoid in Damp-Heat without adding cooling herbs.
Interactions
The draining herbs can add to pharmaceutical diuretics and increase the risk of dehydration and electrolyte loss. Gan Cao may interact with diuretics, digoxin and corticosteroids.
Pregnancy
Use with caution in pregnancy. Hou Po moves Qi downward and may theoretically stimulate uterine activity, and the draining herbs can affect fluid balance.
Breastfeeding
Use only under professional guidance.
Children
Used with professional supervision and reduced dose.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and new swelling needs 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.
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.
- Efficacy and tolerability of micronized purified flavonoid fractions (MPFF) for haemorrhoids: A systematic review and meta-analysis.. Complementary therapies in medicine, 2018. PMID: 30012392.
Origin and history
Combined from Ping Wei San and Wu Ling San, recorded in Pu Ji Fang citing Fu Ren Da Quan Liang Fang, Ming dynasty.
Wei Ling Tang is a combination rather than a single creation: it joins Ping Wei San, the middle-drying formula, with Wu Ling San, the fluid-draining formula. That combination appears in the Ming formularies and became the standard approach when Dampness produces both digestive congestion and visible fluid accumulation.
Classical record
The formula is recorded as the combination of the middle-drying and the fluid-draining approaches, for Dampness that congests the digestion and accumulates as fluid with swelling and loose stools.
Pu Ji Fang, citing Fu Ren Da Quan Liang Fang, Ming dynasty, as recorded in the classical record.
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
How is it different from Wu Ling San?
It adds the middle-drying herbs, so it also treats the digestive fullness and the thick greasy coat that Wu Ling San does not address.
Is it for dry or weeping skin?
Weeping and puffy. The formula drains fluid and dries Dampness, so dry skin would be worse.
Can it cause dehydration?
The draining herbs can, especially alongside diuretic medication, so fluid intake and electrolytes need attention.
When should swelling be investigated?
New, one-sided or progressive swelling, or swelling with breathlessness, needs medical assessment before treatment.