Wei Jing Tang (Reed Decoction)

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Indications

Western Uses:

• What is Wei Jing Tang used for in modern practice?

  In modern practice, Wei Jing Tang's phlegm-heat-and-pus pattern is referenced for conditions marked by purulent lung secretions — historically Lung abscess, and in contemporary integrative use for pneumonia, bronchiectasis, and acute exacerbations of chronic obstructive pulmonary disease (COPD), typically studied alongside conventional antibiotic and respiratory care rather than in place of it.

  These biomedical correlates are offered as a reference to the formula’s traditional use, not as a claim that it treats any disease. A confirmed lung abscess or bacterial pneumonia is a serious infection requiring medical diagnosis and treatment; see cautions and research.

  Source: traditional-use correlates summarized from Bensky & Barolet, Formulas & Strategies, cross-checked against modern clinical research (see research); reference only, not a treatment claim.

Originally Appeared In:

• Thousand Ducat Formulas (Qian Jin Yao Fang)

Notes:

• What does “Wei Jing” mean, and how does Wei Jing Tang compare with related formulas?

  Wei Jing (葦莖, fresh reed stem) and Lu Gen (蘆根, dried reed rhizome) both come from the same plant, Phragmites communis, and are used interchangeably as the chief herb — this database records the ingredient as Lu Gen. Fresh reed was traditionally preferred in the original formula (hence the name Wei Jing Tang), with dried Lu Gen substituting when fresh material is unavailable.

  • vs Xie Bai San: Xie Bai San clears and drains heat wheezing from the Lung without addressing pus or blood stasis; choose Wei Jing Tang once purulent, foul sputum signals an actual abscess.
  • vs Ma Xing Shi Gan Tang: Ma Xing Shi Gan Tang clears Lung heat and stops wheezing/cough but does not expel pus or move blood; the two formulas are sometimes combined clinically (studied as “Maxingshigan-Weijing decoction”) for phlegm-heat cough with early purulent signs (see research).
  • Modern modification: clinical research groups often study an expanded “Qianjin Weijing” or enhanced Wei Jing Tang formula — the base four herbs plus additional heat-clearing or pus-expelling herbs — rather than the classical four-herb decoction alone.

  Source: Sacred Lotus sources & references + Bensky & Barolet, Formulas & Strategies (formula comparisons).

Clinical Studies & Research:

• Is there modern research on Wei Jing Tang?

  Yes — mostly meta-analyses of Chinese-language RCTs pairing Weijing decoction with conventional respiratory pharmacotherapy, plus mechanistic network-pharmacology work. A 2026 systematic review and meta-analysis of 10 RCTs (1,315 patients) found that adding Weijing decoction to conventional treatment for COPD and pneumonia improved overall clinical efficacy and lowered C-reactive protein compared with conventional treatment alone. An earlier meta-analysis (15 RCTs, 986 patients) found the same combination improved lung function (FEV1%) and arterial blood gases, and reduced inflammatory markers (TNF-alpha, IL-8), in acute COPD exacerbations, with no serious adverse events reported.

  • COPD and pneumonia (meta-analysis, 2026): 10 RCTs, 1,315 patients; higher clinical efficacy and reduced CRP with Weijing decoction plus conventional care (PMID 41825248).
  • Acute COPD exacerbations (meta-analysis, 2014): 15 RCTs, 986 patients; improved FEV1%, PaO2/PaCO2, and reduced TNF-alpha/IL-8 with Weijing decoction plus pharmacotherapy (PMID 25165477).
  • Mechanism (network pharmacology + mouse model, 2023): identified beta-sitosterol, tricin, and stigmasterol as key compounds acting on JUN, CASP3, and PTGS2 across six pulmonary diseases (pneumonia, COPD, acute lung injury, pulmonary fibrosis, tuberculosis, NSCLC); confirmed target downregulation in a xenograft mouse model (PMID 37153415).
  • COVID-19 (RCT, 2021): a related combined formula, Maxingshigan-Weijing decoction (Wei Jing Tang combined with Ma Xing Shi Gan Tang), sped recovery from fever, cough, fatigue, and breathing difficulty versus supportive care alone in 59 hospitalized patients (PMID 34660195) — note this trial tested the combined formula, not Wei Jing Tang alone.

  Sources: PubMed 41825248; PubMed 25165477; PubMed 37153415; PubMed 34660195. Research context, not a therapeutic claim; most trials are Chinese-language RCTs pairing the herbal formula with conventional care rather than testing it alone.