Sang Xing Tang (Mulberry leaf and Apricot Kernel Decoction)

Actions

Indications

Western Uses:

• How is Sang Xing Tang used in modern practice?

  Modern practitioners reach for Sang Xing Tang for dry, unproductive coughs that fit the warm-dryness pattern — typically in dry, warm weather or heated indoor environments. It is pattern-matched to conditions such as acute bronchitis, upper-respiratory infections, dry pharyngitis or laryngitis, and the tail end of a cold when a dry, tickly cough lingers — used only when the dryness-with-mild-heat picture is present. A 2022 mechanistic study explicitly frames the formula’s “warm dryness” target as equivalent to acute bronchitis (see research).

  Source: Bensky & Barolet, Formulas & Strategies (modern applications); PubMed 35691159 (warm-dryness framed as acute bronchitis). Pattern-based, traditional-use framing; not a treatment claim.

Originally Appeared In:

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

Notes:

• How does Sang Xing Tang differ from Xing Su San and other dryness formulas?

  The pivotal contrast is warm-dryness versus cool-dryness — the two faces of autumn dryness. Sang Xing Tang treats warm-dryness (early autumn, dryness plus mild warmth): dry cough, dry throat, thirst, a slight fever, a red dry tongue — so it is cool and moistening. Xing Su San treats cool-dryness (late autumn, dryness plus wind-cold): cough with clear thin sputum, chills, headache, no sweating, a dry but not red tongue — so it is warm and acrid-dispersing. Matching the wrong one (warming a warm-dry pattern, or cooling a cool-dry one) worsens the cough.

  • vs Xing Su San — cool-dryness (dryness + wind-cold); warm and acrid, it disperses cold and transforms phlegm.
  • vs Sang Ju Yin — wind-heat rather than dryness: cough with fever and mild thirst, but without the marked dryness of throat and nose.
  • vs Qing Zao Jiu Fei Tang — more severe, deeper dryness with greater heat and Lung qi/yin damage; it clears and moistens far more strongly.

  Modifications: when heat is more pronounced, cooling herbs are emphasized; when dryness has consumed more Lung yin, more fluid-generating, yin-moistening herbs are added — each adjusted to the pattern.

  Discrepancy — the eighth ingredient: Bensky’s Formulas & Strategies lists an added 3 g of Li Pi (Fructus Pyri) — pear skin — which does not appear in his Materia Medica; the Sacred Lotus record notes this and identifies it as pear skin. Because sources differ on whether pear skin belongs in the formula, we present the six core herbs as primary and flag Li Pi as an optional, moistening addition.

  Source: Bensky & Barolet, Formulas & Strategies (dryness-formula comparisons; Li Pi note); Wu Ju-tong, Wen Bing Tiao Bian (warm-dryness vs cool-dryness).

Clinical Studies & Research:

• Is there modern research on Sang Xing Tang?

  Direct modern research is very limited, and what exists is preclinical rather than clinical. The most relevant study is a 2022 investigation combining network pharmacology, metabolomics, and a smoke-induced acute-bronchitis rat model, which framed Sang Xing decoction as a classic prescription for “warm dryness” — treated as equivalent to acute bronchitis in modern terms. It reported that the formula appeared to reduce inflammation by regulating the PI3K/Akt/NF-κB pathway and to lessen oxidative stress through glutamine/glutamate metabolism (PMID 35691159, Biomedicine & Pharmacotherapy). No robust human clinical-trial evidence for the classical formula was found in this review; absence of clinical trials is stated as such, not as proof of ineffectiveness.

  Source: PubMed 35691159 (Sun X et al., Biomed Pharmacother 2022; Sang Xing decoction in smoke-induced acute bronchitis). Preclinical research context, not a therapeutic claim.