Shi Pi Yin (Bolster the Spleen Decoction)

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Indications

Western Uses:

• What is Shi Pi Yin used for in modern practice?

  In modern practice, Shi Pi Yin's yin-edema pattern (chronic, cold, lower-body-predominant swelling with loose stool and no thirst) is traditionally applied where Western medicine recognizes fluid retention tied to reduced organ function — contexts such as chronic kidney disease with nephrotic-range edema, cirrhotic ascites, and congestive states with cold extremities and poor digestion. It is a Spleen-first, qi-moving formula, often paired clinically with more Kidney-focused warming formulas (see notes) or diuretic formulas when fluid accumulation is more pronounced.

  These biomedical correlates are offered as a reference to the formula’s traditional use, not as a claim that it treats any diagnosed disease. Direct modern research on the unmodified classical formula is limited (see research). 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, and Chen & Chen, Chinese Herbal Formulas and Applications; reference only, not a treatment claim.

Originally Appeared In:

• Effective Formulas from Generations of Physicians (Shi Yi De Xiao Fang)

Notes:

• How is Shi Pi Yin different from Zhen Wu Tang, Wu Ling San, and Shu Zao Yin Zi?

  Shi Pi Yin and Shu Zao Yin Zi form the classic yin/yang edema pair from the same source text (Yan Yonghe's Ji Sheng Fang, 1253) — Shi Pi Yin for yin-type (cold, chronic, lower-body) edema from Spleen-Kidney yang deficiency; Shu Zao Yin Zi for yang-type (acute, generalized, excess) edema with damp-heat or blood stasis. They represent opposite ends of the edema spectrum and are not interchangeable.

  • vs Zhen Wu Tang (True Warrior Decoction): both warm yang to move water and share Fu Zi, Bai Zhu, and Fu Ling, but Zhen Wu Tang is more Kidney-focused (uses Bai Shao and Sheng Jiang without the qi-moving/aromatic herbs) and targets water overflowing to cause dizziness, palpitations, and trembling; Shi Pi Yin is more Spleen-focused, with a stronger emphasis on qi movement (Hou Po, Mu Xiang, Da Fu Pi, Cao Guo) for abdominal fullness and distension. The two are frequently combined or compared for severe yang-deficient edema.
  • vs Wu Ling San: Wu Ling San transforms qi to promote urination for a milder Tai Yang water-accumulation pattern (with or without exterior signs) and is not as strongly warming; Shi Pi Yin addresses more pronounced Spleen-Kidney yang collapse with cold limbs and no thirst. The two are commonly combined in clinical practice for cirrhotic ascites when diuresis alone is insufficient.
  • vs Shu Zao Yin Zi (Drain and Soothe Decoction): Shu Zao Yin Zi is the yang-edema counterpart — an excess pattern with generalized swelling, possible exterior signs, and heat or stasis, treated by draining water and vigorously promoting urination and sweating; it is contraindicated for the cold-deficiency pattern Shi Pi Yin treats, and vice versa.

  Source: Bensky & Barolet, Formulas & Strategies (yin/yang edema differentiation, formula comparisons); Chen & Chen, Chinese Herbal Formulas and Applications.

Clinical Studies & Research:

• Is there modern research on Shi Pi Yin?

  Direct modern research on the unmodified, classical twelve-herb formula is limited; the name and its yang-support strategy appear in a small number of modern papers, generally with modified composition, which should be read as adjacent context rather than trials of the exact classical formula.

  • Refractory nephrotic syndrome (integrative review): a 2018 review on combining TCM with immunosuppressive therapy names "Bolster the Spleen Decoction" (Shi Pi Yin) as the representative yang-nourishing, qi-boosting formula for patients on non-steroid immunosuppressants; the herb table listed there (e.g. Yin Yang Huo, Ba Ji Tian, Shu Di Huang) differs from the classical composition above, so this reflects the strategy/name rather than a trial of the exact formula (PMID 29507594).
  • Cirrhotic ascites and intestinal flora (2023 literature review): a review of "Shi-Pi-San" (SPS) and its effect on cirrhotic ascites via intestinal microbiota reported that SPS combined with Western medicine outperformed Western medicine alone in clinical outcomes and was associated with increased beneficial gut-bacteria abundance; the composition described adds Ze Xie and Zhu Ling (diuretic herbs from Wu Ling San), consistent with the common clinical practice of combining Shi Pi Yin with Wu Ling San for ascites, rather than the unmodified classical formula (DOI 10.53388/MMR2023006, Microenvironment & Microecology Research 2023;5(2):6).

  Sources: PubMed 29507594; DOI 10.53388/MMR2023006. Research context on the formula's name/strategy in modified forms, not a therapeutic claim; no dedicated clinical trial or mechanistic study of the unmodified classical formula was located.