Zeng Ye Tang (Increase the Fluids Decoction)

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Indications

Western Uses:

• What is Zeng Ye Tang used for in modern practice?

  In modern practice Zeng Ye Tang is referenced for dryness-related conditions where fluids are depleted — constipation in the elderly or after a febrile illness, chronic dry mouth and throat, and chronic pharyngitis, contexts where Western medicine recognizes dehydration or reduced glandular secretion. Preclinical research has also looked at its constituents in relation to blood glucose regulation and to dry-eye/dry-mouth (sicca) symptoms resembling Sjögren’s syndrome (see research).

  These biomedical correlates are offered as a reference to the formula’s traditional use, not as a claim that it treats any disease. The supporting research is preclinical (animal and analytical-chemistry studies); no controlled human trials of Zeng Ye Tang itself were identified. Any use for a diagnosed condition belongs with a qualified practitioner and appropriate medical care.

  Source: traditional-use correlates summarized from Bensky & Barolet, Formulas & Strategies; research context per PubMed (see research field). Reference only, not a treatment claim.

Originally Appeared In:

• Systematic Differentiation of Warm Diseases (Wen Bing Tiao Bian)

Notes:

• How is Zeng Ye Tang different from Zeng Ye Cheng Qi Tang and Ma Zi Ren Wan?

  Zeng Ye Tang contains no purgative herb at all — it treats dry-bound stool purely by replenishing fluids. The two related formulas add a purgative for cases with more excess in the picture.

  • vs Zeng Ye Cheng Qi Tang (Increase the Fluids and Order the Qi Decoction): the same three herbs plus Da Huang and Mang Xiao, from the same source text (Wen Bing Tiao Bian). Used when fluid depletion is accompanied by some genuine heat-bind, or when Zeng Ye Tang alone fails to move the stool — it combines “floating the boat” with a mild push.
  • vs Ma Zi Ren Wan (Hemp Seed Pill): Ma Zi Ren Wan moistens the intestines with Huo Ma Ren and other seed-oils alongside Da Huang, for constipation from Stomach heat drying the stool with a mild Spleen-restricting pattern — a formula with an excess component. Zeng Ye Tang is reserved for more pronounced yin/fluid depletion, typically after a warm-febrile illness, with no excess signs at all.

  Key modification: add Da Huang and Mang Xiao when the dry stool does not resolve with fluids alone (becomes Zeng Ye Cheng Qi Tang).

  Source: Sacred Lotus origin record + Bensky & Barolet, Formulas & Strategies (comparison of dryness/purgative formulas).

Clinical Studies & Research:

• Is there modern research on Zeng Ye Tang?

  Yes, but it is limited and preclinical — animal-model and analytical-chemistry studies, with no controlled human trials identified. One study profiled the formula’s chemical constituents and tested them in a diabetic mouse model; another tested the whole decoction in a mouse model of Sjögren’s syndrome.

  • Constituent screening / glucose regulation (preclinical): HPLC-MS/MS analysis identified around 50 compounds in Zeng Ye Tang; six shared marker constituents (including catalpol and harpagoside) showed hypoglycemic activity in a type 2 diabetic mouse model (PMID 29098768).
  • Sjögren’s-type dryness (preclinical): in a mouse model of primary Sjögren’s syndrome, Zeng Ye decoction increased saliva flow and submandibular gland index and upregulated aquaporin-1 and aquaporin-5 expression compared with untreated model mice (PMID 24804857).

  Sources: PubMed 29098768; PubMed 24804857. Research context, not a therapeutic claim; evidence is preclinical and no clinical trials of Zeng Ye Tang were identified.