Cao Wu (Prepared Wild Aconite)

Chinese Herb Actions

Chinese Herb Dosage

• What is the reference dosage of Cao Wu?

  1.5–3 g of the prepared root, decocted first for 30–60 minutes (longer at the higher end) before the other herbs are added. Because Cao Wu is regarded as more toxic than Chuan Wu, it is dosed cautiously and only in its processed form; it is never taken raw internally. Doses are a matter for a qualified practitioner — reference information, not a prescription.

  Discrepancy (dose units): the owner’s Five Branches notes give a lower traditional range for Cao Wu — 0.5–1.5 qian (≈1.5–4.5 g) — explicitly smaller than Chuan Wu’s, reflecting Cao Wu’s greater toxicity. We present the modern Chinese Pharmacopoeia range (1.5–3 g); both traditions agree Cao Wu is dosed conservatively.

  Source: owner’s Five Branches notes; Chinese Pharmacopoeia / standard materia medica ranges. Reference only.

Chinese Herb Contraindications & Cautions

• What are the contraindications and cautions for Cao Wu?

  Cao Wu is extremely toxic — more so than Chuan Wu — and is used only in its processed form, in small doses, decocted first and long, and only under qualified professional supervision. It is contraindicated in pregnancy and should be avoided in yin-deficient heat or false-cold patterns. It is not combined with alcohol, which increases alkaloid absorption.

  Per the classical Eighteen Incompatibilities, aconite (Wu Tou) is traditionally not combined with Ban Xia, Gua Lou, Bei Mu, Bai Lian, or Bai Ji.

  Discrepancy (incompatibility list): the owner’s notes record “Bai Zhi” for the aconite entry, which appears to be a transcription slip for Bai Ji / Bai Lian — the herbs named in the standard Eighteen Incompatibilities, which we follow here.

  Source: owner’s Five Branches notes; classical Eighteen Incompatibilities. Reference facts, not self-use instructions.

Chinese Herb Toxicity & Overdose

• Extremely toxic — regarded as more toxic than Chuan Wu; use only the processed root, only under qualified supervision. The toxicity comes from diester diterpenoid alkaloids (aconitine, mesaconitine, hypaconitine, and related compounds). Traditional processing — prolonged boiling/steaming — hydrolyzes these into monoester alkaloids reported to be roughly 1/200 to 1/500 as toxic, which is why only processed Cao Wu is used and why it is decocted first and long.

  As reference safety information, aconitine overdose classically presents with numbness and tingling of the mouth, tongue, and limbs; nausea, vomiting, and salivation; dizziness; and then cardiac arrhythmias (ventricular tachycardia/fibrillation) and hypotension — it can be fatal. These are documented reference facts, not a description of use; any suspected exposure is a medical emergency.

  Sources: PubMed 34315520 / PMC 8314510 (Chinese Medicine, 2021 — Aconitum toxicology & detoxification / processing chemistry); PubMed 35754486 / PMC 9213726 (Frontiers in Pharmacology, 2022 — aconitine cardiotoxicity meta-analysis). Reference safety information.

• This herb is considered extremely toxic.
  (while some Chinese herbs are toxic, it must be noted that many come prepared, or are combined, to mitigate their toxicity)

Herb-Drug Interactions

• Given its narrow therapeutic window and potent cardioactive alkaloids, Cao Wu warrants particular caution alongside other drugs that affect the heart. Additive risk is plausible with antiarrhythmics, cardiac glycosides, and other cardioactive agents, and alcohol is traditionally and pharmacologically avoided because it increases alkaloid absorption and toxicity. Well-controlled clinical interaction data are limited; management belongs with a qualified practitioner. (Flagged for practitioner confirmation — this is reference context, not an exhaustive interaction list.)

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

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

• What does modern research say about Cao Wu (wild aconite)?

  The research is preclinical and centers on aconitine-type alkaloid toxicity balanced against analgesic and anti-inflammatory activity. For Aconitum kusnezoffii specifically, a network-pharmacology study of Cao Wu’s alkaloids (e.g. 3-acetylaconitine, hypaconitine, napelline) predicts analgesic/anti-inflammatory action on pain-related targets such as TNF and IL-10. More broadly, aconitine-type alkaloids show analgesic and anti-inflammatory effects in laboratory models, but through ion-channel mechanisms overlapping their cardiotoxicity — aconitine drives arrhythmia via sodium-channel activation and Na⁺/Ca²⁺ overload. Prolonged heating hydrolyzes the toxic diester alkaloids to far less toxic monoester forms. Human clinical evidence remains limited.

  Sources: PMC 10754605 (PubMed 38206698 — A. kusnezoffii / Cao Wu alkaloids, network-pharmacology of analgesic-inflammatory targets, 2023); PMC 10839071 (aconitine derivatives: analgesic/anti-inflammatory activity & narrow window, 2024); PMC 9213726 (aconitine cardiotoxicity meta-analysis, 2022); PMC 8314510 (Aconitum processing/detoxification, 2021). Preclinical research context, not a therapeutic claim.

Chinese Herb Notes

• How does Cao Wu compare with Chuan Wu and Fu Zi?

  Cao Wu, Chuan Wu, and Fu Zi are all toxic aconites with overlapping uses, but Cao Wu is the strongest and most toxic. Cao Wu is the prepared root of the wild aconite Aconitum kusnezoffii — a different but related species from Chuan Wu — and it shares Chuan Wu’s channels and wind-damp / cold-pain indications while being more potent, so it is dosed more cautiously.

  • vs Chuan Wu — Chuan Wu is the prepared main root of the cultivated A. carmichaelii; same actions, but Cao Wu (wild) is regarded as stronger and more toxic.
  • vs Fu Zi — Fu Zi is the prepared lateral root of A. carmichaelii and is reserved for restoring devastated yang and warming the interior (yang collapse, interior cold), whereas Cao Wu targets wind-damp cold bi pain in the channels and joints.

  Combination: Cao Wu and Chuan Wu are sometimes used together (classically “Wu Tou” pairing) to strengthen the dispersing-cold, pain-stopping effect for severe cold painful obstruction — a combination reserved for expert use given the doubled toxicity.

  Source: owner’s Five Branches notes (differentiation & pairs); standard materia medica.

This herb antagonizes or is antagonized by:

• Xi Jiao (Cornu Rhinoceri)

This herb is incompatible with:

• Bai Ji (Rhizoma Bletillae)
• Ban Xia (Rhizoma Pinelliae Tematae)
• Chuan Bei Mu (Bulbus Fritillariae Cirrhosae)
• Gua Lou (Fructus Trichosanthis Kirlowii)
• Gua Lou Pi (Pericarpium Trichosanthis Kirlowii)
• Gua Lou Ren (Semen Trichosanthis Kirlowii)
• Tian Hua Fen (Trichosanthis Kirlowii Radix)
• Zhe Bei Mu (Fritillariae Thunbergii Bulbus)
• Bai Lian (Radix Ampelopsis)

This herb is considered toxic