Qian Hu (Hogfennel Root)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Qian Hu (Hogfennel Root)?

  Roughly 3–10 g in decoction. Chen & Chen give 6–10 g, Bensky gives 3–9 g; these ranges overlap closely and reflect normal materia medica variation rather than a real discrepancy.

  Source: cross-referenced against multiple online sources and standard materia medica ranges (Bensky; Chen & Chen). Reference only — not a prescription.

Chinese Herb Combinations:

Chinese Herb Contraindications & Cautions

• Are there cautions for Qian Hu (Hogfennel Root)?

  Qian Hu is traditionally avoided for cough due to Yin deficiency with fire, and for cough/wheezing with cold, thin (watery) sputum — both are patterns where its slightly cold, phlegm-heat-transforming action would be inappropriate or aggravating. It is also traditionally used with caution in patients taking blood-thinning (anticoagulant/antiplatelet) medication, reflecting Qian Hu’s documented antiplatelet activity (see below).

  Source: cross-referenced against multiple online sources and standard materia medica cautions (Bensky; Chen & Chen).

Herb-Drug Interactions

• Caution is traditionally advised for patients on anticoagulant or antiplatelet medication. Qian Hu (Peucedanum praeruptorum) contains coumarin-type constituents, and coumarins as a class are associated with antiplatelet and blood-thinning activity; this is a precautionary flag based on the herb’s known chemistry rather than a specific documented clinical drug-interaction study, and practitioner confirmation is reasonable for patients on warfarin or similar agents. (Flagged for practitioner confirmation.)

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Qian Hu (Peucedanum praeruptorum)?

  Yes — an active area of phytochemical and pharmacological research, concentrated on its coumarin constituents, though mostly preclinical. Peucedanum praeruptorum root is chemically rich in pyranocoumarins and furanocoumarins (e.g. praeruptorin-type compounds), which are the focus of most modern research.

  • Anti-inflammatory constituents — compounds isolated from Peucedanum praeruptorum roots were shown to inhibit nitric-oxide production in interleukin-1β-stimulated rat hepatocytes, a laboratory model used to screen anti-inflammatory activity.
  • Comparative regional pharmacology — earlier Chinese pharmacological research compared the effects of the main chemical constituents of Peucedanum praeruptorum sourced from different regions (He’nan vs. Jiangxi), relevant to quality/potency variation by growing region.
  • Species/market authentication — molecular (DNA barcode) work has been used to authenticate commercial “Qian Hu” material, reflecting a recognized need to confirm genuine Peucedanum praeruptorum root in the marketplace given look-alike or substitute materials sold under the same trade name.

  Most current evidence is chemical/preclinical (cell and comparative pharmacology studies); no controlled human clinical trials specific to Qian Hu were identified.

  Sources: PMID 37446738 (anti-inflammatory coumarin constituents, hepatocyte model, Molecules); PMID 16323547 (comparative regional pharmacology, Zhongguo Zhong Yao Za Zhi); PMID 38727924 (molecular authentication of commercial Qian Hu, Molecular Biology Reports). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Qian Hu different from Bai Qian?

  Qian Hu and Bai Qian are different plants that are easily confused by name, but they differ in temperature and in how they direct Lung qi. Qian Hu (Peucedanum praeruptorum root) is bitter, spicy, and slightly cold, and combines phlegm-transformation with wind-heat dispersal; Bai Qian (Cynanchum stauntonii/glaucescens root and rhizome) is acrid and slightly warm (or neutral, depending on source) and is used mainly to direct Lung qi downward and expel phlegm across both cold and heat-type cough, without Qian Hu’s specific wind-heat-dispersing action.

  • Qian Hu (Radix Peucedani) — slightly cold; directs qi down and dispels phlegm-heat; also disperses wind-heat (useful when an exterior wind-heat component is present).
  • Bai Qian (Rhizoma et Radix Cynanchi Stauntonii) — more neutral in temperature; primarily descends Lung qi and expels phlegm for cough/wheezing regardless of cold or heat pattern, and does not carry Qian Hu’s wind-heat-dispersing action.

  Common combinations: with Xing Ren, Su Ye, and Ban Xia in Xing Su San for cough due to external cool-dryness; also found in Ren Shen Bai Du San (assisting the exterior-releasing/qi-regulating action in externally-contracted patterns) and Su Zi Jiang Qi Tang (assisting qi-descent for cough/wheeze with phlegm). (Traditional formula context, not treatment advice.)

  Source: cross-referenced against multiple online sources and Bensky, Materia Medica (3rd ed.); Sacred Lotus sources & references (formula links).