Chuan Xiong (Szechuan Lovage Root)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Chuan Xiong?

  Roughly 3–9 g in decoction (up to 10 g per Chen & Chen), or 1–1.5 g as powder. Bensky gives 3–9 g in decoction and 1–1.5 g in powder form; Chen & Chen give a slightly wider decoction range of 3–10 g with the same 1–1.5 g powder dose — a minor range difference between the two standard references, not a real discrepancy.

  Source: Bensky & Barolet, Materia Medica (3rd ed.); Chen & Chen, Chinese Medical Herbology and Pharmacology (existing Sacred Lotus content). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Chuan Xiong?

  Chuan Xiong should be used with caution during pregnancy, avoided in patients with excessive menses or a bleeding tendency, and is not used for Yin-deficiency Fire presenting with a red tongue and dry mouth. Its acrid, warm, upward- and outward-moving nature makes it well suited to Wind-type and stasis headaches but unsuited to deficiency-heat or bleeding-prone presentations.

  Source: Sacred Lotus reference notes (existing Sacred Lotus content), consistent with standard materia medica cautions for Blood-invigorating, Wind-dispersing herbs. Traditional-use framing.

Chinese Herb Toxicity & Overdose

• Low at standard therapeutic doses. Reference materia medica notes describe rare adverse effects, generally associated with excessive or prolonged dosing: shortened intervals between menses, menorrhagia, urinary frequency, abdominal tingling and pain, headache, vomiting, and painful urination. These read as dose-related cautions rather than signals of significant intrinsic toxicity.

  Source: Sacred Lotus reference notes (existing Sacred Lotus content), consistent with Bensky & Barolet / Chen & Chen toxicity notes for Chuan Xiong. Reference note, not a safety guarantee.

Herb-Drug Interactions

• Chuan Xiong may interact with anticoagulant/antiplatelet drugs. This traditional caution has plausible pharmacological support: reviewed constituents such as tetramethylpyrazine (ligustrazine) and ferulic acid inhibit platelet aggregation and affect calcium-channel activity, mechanisms that could compound the effect of prescription blood thinners. No controlled clinical interaction study has confirmed this in humans. (Flagged for practitioner confirmation — combine with warfarin, DOACs, or antiplatelet drugs only under professional supervision.)

  Source: Sacred Lotus reference notes (existing Sacred Lotus content); mechanistic support from Li W, Tang Y, Chen Y, Duan JA, Molecules 2012 (DOI 10.3390/molecules170910614, PMC 6268834). Practitioner-caution note, not a demonstrated clinical interaction.

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 Chuan Xiong (Ligusticum chuanxiong)?

  Yes — chemistry and preclinical pharmacology are well studied, with meta-analysis-level clinical evidence for migraine at the formula level, and mixed, older, or since-withdrawn evidence for stroke. The rhizome contains phthalides (notably ligustilide), phenolic acids (ferulic acid), and the alkaloid tetramethylpyrazine (TMP/ligustrazine), reported to have antiplatelet, vasodilatory, anti-inflammatory, and neuroprotective activity in cell and animal models.

  • Migraine (meta-analysis of RCTs) — a systematic review and meta-analysis of 37 randomized controlled trials (n = 3,307) found the classical formula Chuanxiong Chatiao San, alone or combined with conventional Western medicine, produced greater efficacy and fewer adverse events than Western medicine alone for migraine; this is a formula-level result, not proof for the single herb.
  • Cerebral ischemia / stroke (mixed, dated evidence) — a small, older double-blind trial (n = 220) reported chuanxiong preparations outperformed low-molecular-weight dextran for acute cerebral infarction (86.6% vs 62.8% total efficacy rate, P < 0.01), but a 2010 Cochrane systematic review found the supporting trial evidence for stroke prevention weak and at risk of bias, and the review's 2016 update was formally withdrawn. Treat stroke-prevention claims as unresolved, not established.
  • Cardiovascular / hemorheology (preclinical) — chuanxiong constituents (ferulic acid, TMP) inhibit platelet aggregation, improve blood fluidity, and show vasodilatory and antihypertensive effects in laboratory and animal studies.
  • Chemistry review — a comprehensive 2012 review catalogs organic acids/phenols, roughly 48 phthalides, alkaloids, and polysaccharides, and summarizes reported cardiovascular, neuroprotective, anti-inflammatory, and antioxidant activities.

  Human clinical evidence is strongest at the formula level (migraine); single-herb, mechanistic, and stroke-related evidence remains preclinical or dated/contested.

  Note: the 2010 Cochrane review on chuanxiong preparations for stroke prevention had its 2016 update formally withdrawn, and the review itself judged the underlying trials weak/biased. We keep the citation for transparency but flag the stroke-prevention indication as unresolved rather than established.

  Sources: PMID 31467571 / PMC 6699287 (Chuanxiong Chatiao San systematic review & meta-analysis, migraine, Evid Based Complement Alternat Med 2019); PMID 1379860 (chuanxiong vs dextran 40, acute cerebral infarction, Zhongguo Zhong Xi Yi Jie He Za Zhi 1992); PMID 20091603 (Cochrane review, chuanxiong preparations for preventing stroke, 2010; update PMID 27258581 withdrawn 2016); DOI 10.3390/molecules170910614 / PMC 6268834 (Li W et al., chemistry & bioactivity review, Molecules 2012). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Chuan Xiong different from Dang Gui, and what does it combine with?

  Chuan Xiong and Dang Gui are the two Blood-invigorating herbs paired at the heart of Si Wu Tang, but Chuan Xiong is the more acrid, moving herb that also expels Wind and stops pain, while Dang Gui is the richer Blood tonic. Chuan Xiong is prized for its dual action on both Qi and Blood stagnation and its distinctive reach into the head for Wind-type headache — a role Dang Gui does not share.

  • Dang Gui — tonifies and invigorates Blood; moistens; the primary blood-nourishing herb in gynecological formulas.
  • Chuan Xiong — invigorates Blood and moves Qi; acrid and dispersing; the go-to herb when stasis reaches the head (headache) or Qi stagnation is also present.

  Key formulas built around it: it is the defining herb in Chuan Xiong Cha Tiao San (Ligusticum Chuanxiong Powder to be Taken with Green Tea, for Wind-type headache); pairs with Dang Gui, Bai Shao, and Shu Di Huang in Si Wu Tang (Four Substance Decoction) and its derivatives (Ba Zhen Tang, Shi Quan Da Bu Tang, Dang Gui Shao Yao San); and also appears in Xue Fu Zhu Yu Tang (Blood stasis in the chest), Sheng Hua Tang (postpartum abdominal pain/retained lochia), Wen Jing Tang (gynecological cold-stasis), Jiao Ai Tang (uterine bleeding), and Bu Yang Huan Wu Tang (Qi-deficiency Blood stasis, e.g. post-stroke sequelae). (Traditional formula context, not treatment advice.)

  Source: Sacred Lotus Sacred Lotus sources & references; Bensky & Barolet, Formulas & Strategies (2nd ed.).