Hou Po Wen Zhong Tang
Magnolia Bark Decoction for Warming the Middle
- Category
- Formulas that Regulate the Qi
- Subcategory
- Formulas that Promote the Movement of Qi
- Ingredients
- 7 herbs
Actions
What does Hou Po Wen Zhong Tang do?
Hou Po Wen Zhong Tang (Magnolia Bark Decoction for Warming the Middle) warms the middle burner, moves qi, and dries cold-damp to relieve distention and pain in the Spleen and Stomach. It is built around a warming, qi-moving pair rather than a rich tonic, so it clears the obstruction directly instead of nourishing underlying deficiency.
The seven ingredients divide by role:
- Chief: Hou Po (Magnolia Bark) — moves qi, dries dampness, and relieves the fullness and distention at the center of the pattern.
- Deputies: Cao Dou Kou (Katsumada's Galangal Seed) and Gan Jiang (Dried Ginger) — warm the middle and expel the underlying cold that Hou Po's qi-moving action alone cannot resolve.
- Assistants: Chen Pi (Aged Citrus Peel) and Mu Xiang (Costus Root) further regulate qi and ease pain; Fu Ling (Poria) drains dampness and supports the Spleen.
- Envoy: Zhi Gan Cao (Honey-Fried Licorice Root) harmonizes the formula and moderates the drying, warming herbs.
Source: this site’s own composition record; role analysis (roles unset in this site’s own record) derived from Bensky & Barolet, Formulas & Strategies, cross-referenced against multiple online sources, which independently agree on this chief/deputy/assistant/envoy division. Traditional-use framing; not medical advice.
Indications
What is Hou Po Wen Zhong Tang used for?
Hou Po Wen Zhong Tang treats cold-damp accumulating in the Spleen and Stomach, obstructing the movement of qi. The classic source text is Li Dong-yuan's Nei Wai Shang Bian Huo Lun (Clarifying Doubts about Damage from Internal and External Causes, Jin-Yuan dynasty), where it addresses a cold, qi-stagnant middle burner rather than a purely deficient one.
Its classic clinical presentation:
- Core pattern: distention and fullness in the epigastrium and abdomen, sometimes with pain, that is worse with cold and eased by warmth.
- Accompanying signs: reduced appetite, fatigue or heavy limbs, and loose stools from the cold-damp burdening Spleen function.
Tongue and pulse: a pale tongue with a white, slippery coat; the pulse is typically deep (submerged) and slow, or wiry and slippery.
Source: this site’s own tongue record ("White slippery tongue coat") + Bensky & Barolet, Formulas & Strategies; classic source text cross-referenced against multiple online sources. Traditional-use framing; not medical advice.
Western Uses:
What is Hou Po Wen Zhong Tang used for in modern practice?
In modern practice, Hou Po Wen Zhong Tang is referenced for digestive complaints that present with a cold, qi-stagnant quality — practitioners have traditionally applied it to patterns resembling functional dyspepsia, chronic gastritis, gastric or duodenal ulcer, and enteritis-type presentations marked by cold-triggered distention and pain.
These biomedical correlates are offered as a reference to the formula’s traditional use, not as a claim that it treats any diagnosed disease. Contemporary study of the formula itself is limited to analytical-chemistry and network-pharmacology work (see research); no clinical trials on the formula were located. Any use for a diagnosed condition belongs with a qualified practitioner and appropriate medical care.
Source: traditional-use correlates summarized from multiple online sources, cross-checked against the cold-damp Spleen-Stomach pattern in Bensky & Barolet, Formulas & Strategies; reference only, not a treatment claim.
Ingredients
7 substances in Hou Po Wen Zhong Tang — each links to its full herb monograph.
Hou Po9-15 gAromatic Herbs that Transform and Dissolve Dampness
Cao Dou Kou6-9 gAromatic Herbs that Transform and Dissolve Dampness
Chen Pi9-15 gRegulate the Qi
Fu Ling9-12 gRegulate Water and Drain Dampness
Gan Jiang1.5-6 gWarm the Interior and Expel Cold
Mu Xiang6-9 gRegulate the Qi
Zhi Gan Cao3-9 gTonify QiPreparation & dosage
How is Hou Po Wen Zhong Tang prepared?
Hou Po Wen Zhong Tang is prepared as a decoction of the seven herbs, classically with a few slices of fresh Sheng Jiang (ginger) added while decocting to reinforce the warming action, and taken warm. As with other decoctions built for an active cold-damp pattern, it is taken for the duration of the episode rather than long-term.
Source: multiple online sources (fresh ginger added during decoction), cross-checked against the formula's warming strategy in Bensky & Barolet, Formulas & Strategies. Reference only, not a dosing instruction.
Decoction. Reference relative amounts (per this site’s own composition record): Hou Po 9-15 g; Chen Pi 9-15 g; Fu Ling 9-12 g; Cao Dou Kou, Mu Xiang 6-9 g; Zhi Gan Cao 3-9 g; Gan Jiang 1.5-6 g. Classic preparation adds a few slices of fresh Sheng Jiang while decocting. Reference only, not a dosing instruction.
Safety — read before use
What are the cautions for Hou Po Wen Zhong Tang?
Hou Po Wen Zhong Tang is a warming, drying formula for cold-damp excess, so it is inappropriate where the pattern is actually heat, or where deficiency (not cold-damp) is the primary problem. Its aromatic, warming herbs can aggravate a case that is really Qi deficiency alone or Stomach Yin deficiency, since drying and warming further consume fluids or fail to address the underlying deficiency.
- Avoid or use cautiously where there are signs of heat, or of Stomach Yin deficiency (dry mouth, hunger without desire to eat, dry stool).
- Not for Qi deficiency without cold-damp — the formula's drying, qi-moving herbs are not tonifying and can worsen simple deficiency.
- Duration: as with most formulas built to clear an excess pattern, it is intended for the cold-damp episode, not indefinite use.
Source: multiple online sources (contraindication in Qi deficiency and Stomach Yin deficiency), cross-checked against the warming/drying composition per Bensky & Barolet, Formulas & Strategies. Traditional-use framing; not medical advice.
Originally Appeared In:
- Clarifying Doubts About Injury from Internal and External Causes (Nei Wai Shang Bian Huo Lun)
Notes:
How is Hou Po Wen Zhong Tang different from Ping Wei San?
Hou Po Wen Zhong Tang and Ping Wei San share a core (Hou Po, Chen Pi, and licorice) but diverge in emphasis: Ping Wei San is classed among formulas that transform damp turbidity, built around Cang Zhu to dry general damp encumbrance of the middle burner; Hou Po Wen Zhong Tang is classed among formulas that promote the movement of qi, swapping in Gan Jiang, Cao Dou Kou, Mu Xiang, and Fu Ling to warm more pronounced cold and move qi against pain, rather than drying damp turbidity alone.
- Choose Ping Wei San when damp encumbrance and turbidity (heavy sensation, greasy coat) dominate without marked cold or pain.
- Choose Hou Po Wen Zhong Tang when cold is prominent (pain and distention worse with cold, better with warmth) alongside qi stagnation.
Source: formula-category placement (this site’s own category record "Formulas that Promote the Movement of Qi" vs. Ping Wei San's damp-transforming category) cross-checked against Bensky & Barolet, Formulas & Strategies, cross-referenced against multiple online sources.
Clinical Studies & Research:
Is there modern research on Hou Po Wen Zhong Tang?
Yes, but it is limited to analytical-chemistry and network-pharmacology work on the formula's material basis; no clinical trials on the formula itself were located on PubMed. Researchers have profiled its chemical constituents and used network pharmacology to propose which compounds and pathways plausibly underlie its traditional digestive use.
- Material basis / quality control: HPLC fingerprinting, UHPLC-ESI-LTQ-Orbitrap-MS, and network pharmacology identified 73 constituents and narrowed them to four candidate quality-control markers — magnolol, honokiol, hesperidin, and glycyrrhizic acid — with magnolol and honokiol linked in the cited literature to gastrointestinal motility and functional dyspepsia, and glycyrrhizic acid to gastric-mucosa protection (PMID 31337148).
- Preparation technology: a study on decoction-piece granularity, water volume, and boiling time used this formula as the working example for standardizing classical-prescription preparation (PMID 31872736).
- Network pharmacology (chronic gastritis and depression): mapped 144 chemical components to 251 targets, finding 104 targets shared between chronic gastritis and depression models and implicating IL-17, TNF, PI3K-Akt, and toll-like-receptor signaling pathways (DOI 10.2174/0122102981267217231114191056).
Sources: PubMed 31337148; PubMed 31872736; DOI 10.2174/0122102981267217231114191056. Research context, not a therapeutic claim; no clinical-trial evidence on this formula was found.
Sources & References
Compiled and edited by Thomas Dehli, Founder & Editor, Sacred Lotus Updated
The information here is referenced from numerous sources — teachers, practitioners, class notes from Five Branches University, the books below, and the published research literature, with citations given as resolvable PubMed identifiers. Where sources disagree, I have flagged the discrepancies directly. If facts couldn't be verified, I have left them out. How we source our content.
Reference information for students and practitioners — not medical advice. Consult a qualified practitioner. Terms of use.
Chinese Formulas Books & References
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