Bai Qian (Root and Rhizome of Cynanchum)

Chinese Herb Actions

Chinese Herb Dosage

• What is the dosage of Bai Qian, and what does honey-frying change?

  Roughly 3–10 g in decoction, used either raw or honey-fried (mi zhi). Honey-frying increases its moistening quality — a better choice for dry cough or dyspnea from Lung yin deficiency — and also reduces the gastrointestinal irritation the raw herb can cause.

  • Standard range — 3–10 g.
  • Honey-fried Bai Qian — preferred when there is a dry-cough/Lung-yin-deficiency component, and gentler on the stomach than the raw form.

  Source: Sacred Lotus sources & references (Bensky; Chen & Chen). Reference only — not a prescription.

Chinese Herb Combinations:

Chinese Herb Contraindications & Cautions

• Are there cautions for Bai Qian?

  Yes — avoid in Lung/qi deficiency where the Kidney fails to grasp qi, use cautiously in dry cough from Lung yin deficiency, and note that the raw (unprocessed) root can irritate the gastrointestinal tract.

  • Lung/qi deficiency, or Kidney failing to grasp qi — avoid; Bai Qian is meant for excess-type phlegm-cough, not deficiency-type wheezing.
  • Dry cough from Lung yin deficiency — use with caution; the honey-fried form is preferred here.
  • Raw Bai Qian — can irritate the gastrointestinal tract; use with caution in patients with a history of bleeding or peptic ulcers.

  Source: Sacred Lotus sources & references (Bensky; Chen & Chen).

Chinese Herb Toxicity & Overdose

• Low toxicity reported in the materia medica literature at standard decoction doses. The main documented concern is direct gastrointestinal irritation from the raw (unprocessed) root, which honey-frying largely mitigates; no significant systemic toxicity is established in the sources reviewed.

  Source: Sacred Lotus sources & references (Bensky; Chen & Chen); genus-wide pharmacology review, PMC 6099929.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Bai Qian in the literature reviewed.

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 Bai Qian (Cynanchum stauntonii)?

  Yes — mostly preclinical phytochemistry and pharmacology, including one direct species-comparison study relevant to the Bai Qian/Bai Wei distinction.

  • Direct species comparison — a pharmacological comparison of Bai Qian and Bai Wei extracts found C. stauntonii (Bai Qian) produced significant antitussive and expectorant effects, with anti-asthmatic and anti-inflammatory activity, while C. atratum (Bai Wei) and C. versicolor performed less well on these respiratory endpoints. PMID 9772633.
  • Mechanism study (2024) — Cynanchi Stauntonii Rhizoma et Radix reduced lung inflammation, neutrophil infiltration, and pulmonary edema in a mouse model of sepsis-induced acute lung injury, via inhibition of ROS-mediated, p53-driven lung epithelial cell apoptosis; the study combined network pharmacology with an in vivo LPS model. PMC 10995315.
  • Phytochemistry — several novel C21 steroidal and secopregnane-type glycosides have been isolated from Cynanchum stauntonii roots. PMC 3595692; PMC 6152625.
  • Genus-wide review — a broader review of ethnobotany, phytochemistry, and pharmacology across Cynanchum species covers both stauntonii and atratum. PMC 6099929.

  Evidence is preclinical (cell/animal/phytochemical); no human clinical trials were identified in the literature reviewed.

  Sources: PMID 9772633; PMC 10995315; PMC 3595692; PMC 6152625; PMC 6099929. Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Bai Qian different from Bai Wei and from Qian Hu?

  All three are used for cough, but for different patterns: Bai Qian descends Lung qi and expels phlegm regardless of hot or cold; Bai Wei — a different species in the same genus — instead clears deficiency heat; and Qian Hu shares Bai Qian's phlegm-descending role but suits phlegm-heat specifically.

  • Bai Wei (Cynanchum atratum) — same genus, different species, different action: clears deficiency heat and cools the blood, used for unexplained or yin-deficiency fevers and postpartum fever — not primarily a phlegm-cough herb. A direct comparative pharmacology study found Bai Qian (and the related C. glaucescens) produced stronger antitussive and expectorant effects than Bai Wei. PMID 9772633.
  • Qian Hu (Peucedanum praeruptorum) — shares Bai Qian’s Lung-qi-descending, phlegm-expelling role, but is bitter-acrid and slightly cold, making it the better match for phlegm-heat specifically, whereas the neutral-to-slightly-warm Bai Qian suits phlegm-cough regardless of hot or cold.
  • Zhi Sou San combines Bai Qian with Jing Jie, Zi Wan, and Bai Bu for cough from lingering wind after an external cold invasion. (Traditional formula context, not treatment advice.)

  Source: Sacred Lotus sources & references (Bensky; Chen & Chen); PMID 9772633; Sacred Lotus formula cross-reference.