Ling Xiao Hua (Chinese Trumpetcreeper Flower)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Ling Xiao Hua?

  Commonly 3–10 g in decoction — several standard references cite roughly 5–9 g as the typical working range, with some giving a narrower 3–6 g. It can also be taken as a powder, and is used externally (pounded into powder for topical application, or decocted as a wash) for skin conditions.

  Note: Correct identification matters for dosing — genuine Campsis flower (Flos Campsis) is sometimes confused in the herb trade with the visually similar but toxic Datura metel flower (Flos Daturae Metelis, Yang Jin Hua), whose safe dose is far lower (roughly 0.3–0.6 g). See Toxicity below.

  Source: published Chinese materia medica dosage ranges, cross-checked across multiple practitioner herb databases. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Ling Xiao Hua?

  Ling Xiao Hua is contraindicated in pregnancy — as a strong Blood-invigorating, stasis-breaking herb it can stimulate uterine contraction. It should also be used cautiously in Qi and Blood deficiency and in patients prone to heavy menstrual bleeding, since its primary action moves rather than tonifies Blood.

  • Sourcing/identification (reference note) — genuine Campsis flower must be correctly distinguished from the toxic, visually similar Datura metel flower; see Toxicity below.

  Source: published Chinese materia medica cautions, cross-checked across multiple practitioner herb databases; pregnancy contraindication is consistent across all sources reviewed.

Chinese Herb Toxicity & Overdose

• Authentic Campsis grandiflora flower is described as non-toxic in the peer-reviewed toxicology literature. The real, documented safety issue is market substitution: dried Campsis flower (Ling Xiao Hua / Flos Campsis) closely resembles dried Datura metel flower (Yang Jin Hua / Flos Daturae Metelis), which is toxic (tropane alkaloids: roughly 0.3–0.43% scopolamine and hyoscyamine/atropine) and dosed far lower (about 0.3–0.6 g vs. 5–9 g for Campsis). A Hong Kong toxicology review attributes a substantial share of herbal anticholinergic poisoning cases to this specific mix-up, estimating that preventing it would eliminate roughly 40% of such cases in the reviewed period.

  Note: Some general herb-profile sites describe Ling Xiao Hua itself as “slightly toxic” with overdose symptoms (nausea, diarrhea, arrhythmia). The peer-reviewed toxicology source used here attributes documented poisoning specifically to substitution with Datura metel rather than to authentic Campsis grandiflora at normal doses; we keep both positions visible given the safety stakes.

  Source: PMID 26999208 (Chan, “Herbal Medicines Induced Anticholinergic Poisoning in Hong Kong,” Toxins, 2016) for the substitution/poisoning data; general herb-profile sources for the contrasting “slightly toxic” framing. Reference note, not a safety guarantee — correct herb sourcing/identification matters.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Ling Xiao Hua. Preclinical pharmacology has reported mild antiplatelet and vasorelaxant activity for Campsis grandiflora flower extracts, which, combined with its traditional Blood-invigorating use, is a reasonable basis for practitioner caution in patients on anticoagulant or antiplatelet medication (e.g., warfarin, aspirin, clopidogrel) — this is precautionary, not a demonstrated clinical interaction. (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 Ling Xiao Hua (Campsis grandiflora)?

  Yes — preclinical and mechanistic studies support several traditional uses, but no clinical trials on the isolated herb were found. Chemically, the flower contains flavonoids (including apigenin), phenolic acids (including acteoside), iridoids, and triterpenoids.

  • Blood circulation (preclinical, mouse model) — a methanol extract of dried Campsis grandiflora flower improved peripheral blood flow in a mouse “stagnant Blood” model (hen-egg-white-lysozyme sensitization); bioassay-guided fractionation identified apigenin and acteoside as the active compounds, supporting the traditional Blood-invigorating use. Animal model, not clinical evidence.
  • Skin / antioxidant & anti-inflammatory (preclinical) — a 50% ethanol extract protected human dermal fibroblasts from oxidative (hydrogen-peroxide) damage, scavenged free radicals in vitro, and reduced ear-edema swelling in mice induced by inflammatory agents, offering a plausible mechanism for the traditional use in hot, inflamed skin conditions. Cell and animal models, not clinical proof.
  • Formula-level mechanism (rosacea) — a network-pharmacology and molecular-docking study of Liang Xue Wu Hua Tang (which contains Ling Xiao Hua among its five flowers) proposed that the formula may act on rosacea via immune pathways (TNF, IL-17, Toll-like receptor signaling), predicting quercetin, kaempferol, and baicalein among the active constituents. Computational/mechanistic, not a clinical trial, and does not isolate Ling Xiao Hua’s individual contribution.
  • Safety/authentication — toxicology review work (see Toxicity above) documents that genuine Campsis flower is non-toxic and that real-world poisoning risk comes from market substitution with Datura metel flower, underscoring the importance of correct herb identification.

  Overall the evidence base is preclinical/mechanistic; human clinical trials on Ling Xiao Hua itself were not found in this review.

  Sources: DOI 10.1177/1934578X19873445 (Oku et al., stagnant-Blood mouse model, Natural Product Communications, 2019); PMID 16169696 (Cui et al., antioxidative/anti-inflammatory effects, Journal of Ethnopharmacology, 2006); PMID 38941423 (Cui & Fan, Liang Xue Wu Hua Tang network pharmacology for rosacea, Medicine, 2024); PMID 26999208 (Chan, anticholinergic poisoning/substitution review, Toxins, 2016). Research context, not a therapeutic claim.

Chinese Herb Notes

• What are Ling Xiao Hua’s key combinations, and how does it differ from other Blood-invigorating herbs?

  Ling Xiao Hua is distinguished among Blood-invigorating herbs by combining a stasis-breaking action with a cooling, Wind-dispelling one — most Blood movers (Hong Hua, Chuan Xiong, Tao Ren) are warm or neutral, while Ling Xiao Hua is specifically chosen when Blood stasis or Blood heat is generating skin symptoms (itching, rashes, rosacea/acne) alongside or instead of gynecological complaints.

  • For amenorrhea / irregular menstruation from Blood stasis — combined with Dang Gui, Hong Hua, and Chi Shao to move Blood and unblock menstruation.
  • For itching and rashes from Blood heat and Wind — combined with Mu Dan Pi, Sheng Di Huang, Bai Ji Li (Tribulus), and Chan Tui to cool the Blood and extinguish Wind.
  • Formula context — Ling Xiao Hua is one of the five flowers in Liang Xue Wu Hua Tang (“Cool the Blood Decoction with Five Flowers”: Hong Hua, Ji Guan Hua, Ling Xiao Hua, Mei Gui Hua, Ye Ju Hua), a formula used for rosacea and acne from Blood heat. (Traditional formula context, not treatment advice.)

  Source: published Chinese materia medica combination notes, cross-checked across multiple practitioner herb databases; formula composition confirmed against a published practitioner formula reference.