☯ TCM Properties
Expels Wind-Dampness, d isperses Cold, w arms and activates the channels and s tops pain; Reduces swellings, induces ulceration and dispels putrefication; Treats unconsciousness caused by Phlegm Stagnation
Traditional Chinese Uses
Chuan Wu is the processed mother root tuber of Aconitum carmichaelii, a pungent, bitter, hot substance entering the Heart, Liver, Kidney and Spleen channels. It is classically valued to dispel Wind-Dampness, warm the channels, disperse Cold and powerfully stop pain, making it a leading remedy for chronic bi (painful obstruction) syndrome, cold-natured arthralgia, rheumatic and traumatic joint pain that worsens with cold, as well as cold pain of the chest and abdomen. It is a chief ingredient in formulas such as Wu Tou Tang and is often paired with Ma Huang, Bai Shao and honey.
Only the processed (zhi) root is used internally; it must be decocted long and first. Contraindicated in pregnancy and traditionally incompatible with Ban Xia, Gua Lou, Bei Mu, Bai Ji and Bai Lian (the "eighteen antagonisms").
Western Herbalism Properties
Botanical Description
Chuan Wu is the processed parent (mother) root tuber of Aconitum carmichaelii Debx. (Ranunculaceae), a perennial herb 60 to 150 cm tall of Sichuan and adjacent provinces with palmately divided dark green leaves and tall racemes of helmet-shaped deep blue-purple flowers. WARNING: The raw root is highly toxic owing to diester diterpenoid alkaloids, principally aconitine, mesaconitine, and hypaconitine, which can cause fatal cardiac arrhythmia and respiratory failure; only properly processed (Zhi Chuan Wu) material, prolonged-boiled to hydrolyze the alkaloids to far less toxic monoester forms, is used clinically. In traditional Chinese medicine Chuan Wu is acrid, bitter, hot, and toxic, entering the Heart, Liver, Kidney, and Spleen channels; it dispels wind-cold-damp, warms the channels, and relieves severe pain in bi-syndromes, cold abdominal pain, and traumatic injury, always under strict dose control.
Active Constituents
Aconitine
Diester diterpenoid alkaloid (C19)Concentration: Main toxic alkaloid; sharply reduced by processing
The principal toxic and analgesic diester alkaloid. It binds open voltage-gated sodium channels and prevents their inactivation, producing potent analgesia and anti-inflammatory effects but also severe cardiac and neurological toxicity in the raw root.
Mesaconitine
Diester diterpenoid alkaloid (C19)Concentration: Major toxic alkaloid
A highly toxic diester alkaloid with analgesic and anti-inflammatory activity and cardiotoxic potential comparable to aconitine.
Hypaconitine
Diester diterpenoid alkaloid (C19)Concentration: Major toxic alkaloid
One of the three principal diester diterpenoid alkaloids; analgesic and anti-inflammatory but cardiotoxic and neurotoxic.
Benzoylaconine
Monoester diterpenoid alkaloidConcentration: Increases with processing (hydrolysis of aconitine)
A monoester alkaloid formed when heat/processing hydrolyzes one ester bond of aconitine; far less toxic while retaining cardiotonic and anti-inflammatory activity, part of why 'pao zhi' processing detoxifies the herb.
Aconine
Aminoalcohol diterpenoid alkaloidConcentration: Increases with prolonged decoction/processing
The fully hydrolyzed aminoalcohol alkaloid, with much lower toxicity (roughly thousands-fold less than aconitine) and residual cardiotonic action.
Songorine
Diterpenoid alkaloidConcentration: Minor
A less-toxic diterpenoid alkaloid reported to have anti-inflammatory and cardiac activity.
⚠ Drug Interactions
Antiarrhythmic and cardiac drugs (including digoxin, class I/III antiarrhythmics)
Aconitine-type alkaloids persistently activate cardiac sodium channels and disturb intracellular calcium, promoting ventricular arrhythmias; combining with drugs that also affect cardiac conduction can be additive or unpredictable.
Clinical note: Avoid concurrent use; aconitine cardiotoxicity is managed with sodium-channel blockers such as lidocaine and supportive care.
CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin, ritonavir)
Aconitine alkaloids are metabolized largely by CYP3A; inhibiting this pathway raises plasma alkaloid concentrations and the risk of poisoning.
Clinical note: Avoid combining with strong CYP3A4 inhibitors; the narrow therapeutic margin makes even small increases dangerous.
Licorice / Glycyrrhiza (Gan Cao) co-medication
The classic Aconite-Licorice pairing reduces toxicity: licorice flavonoids can precipitate diester alkaloids and slow their intestinal absorption, and Glycyrrhiza can induce CYP3A to accelerate clearance of toxic alkaloids.
Clinical note: This is a traditional detoxifying combination, but doses and processing must still be controlled by a qualified practitioner.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 3-9g | Daily | — | — | — |
Preparation Methods
Processed root, prolonged decoction
Parts: processed main root (Zhi Chuan Wu)
Only the detoxified processed root is used internally, typically 1.5-3 g, and it must be pre-decocted (boiled) 30-60 minutes or longer before adding other herbs so heat hydrolyzes the diester alkaloids to far less toxic mono-ester and aminoalcohol forms. Never use the raw root internally.
External application
Parts: processed root
Powdered processed root is incorporated into liniments, plasters or wine-based washes applied over painful wind-damp bi joints; even topically, absorption can be significant so use is limited and unbroken skin is required.
Clinical Studies
Randomized, Double-Blinded, Multicenter, Placebo-Controlled Trial of Shenfu Injection for Treatment of Patients with Chronic Heart Failure during the Acute Phase of Symptom Aggravation (Yang and Qi Deficiency Syndrome)
Shenfu injection (from Aconitum carmichaelii / Fuzi plus ginseng) added to standard therapy improved heart-failure outcomes and symptom scores in patients with yang and qi deficiency, illustrating the warming, yang-rescuing use of processed aconite root.
Efficacy and Safety of Fuzi Formulae on the Treatment of Heart Failure as Complementary Therapy: A Systematic Review and Meta-Analysis of High-Quality Randomized Controlled Trials
Pooling high-quality trials of Fuzi (processed root of Aconitum carmichaelii) formulae as add-on therapy for heart failure found improvements in cardiac function endpoints, while underscoring the need for strict processing and dosing for safety.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica)
Han dynasty (c. 200 CE)Jin Gui Yao Lue (Essentials from the Golden Cabinet)
Eastern Han (c. 200-220 CE), Zhang ZhongjingBen Cao Gang Mu (Compendium of Materia Medica)
Ming dynasty, 1578, Li ShizhenReferences
- Chan TYK. Aconite poisoning . Clinical Toxicology (2009) [DOI]
- Zhou G, Tang L, Zhou X, Wang T, Kou Z, Wang Z. A review on phytochemistry and pharmacological activities of the processed lateral root of Aconitum carmichaelii Debeaux . Journal of Ethnopharmacology (2015) [DOI]
- Chinese Pharmacopoeia Commission. Pharmacopoeia of the People's Republic of China (Radix Aconiti, Chuan Wu; processing and dosage) . China Medical Science Press (2020) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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