Zhi Chuan Wu
StarAconitum carmichaelii Debx.
Traditionally used for
- Pain & joints
Cautions & contraindications
- Pregnancy
- Heart conditions
- Toxic — professional use only
☯ TCM Properties
Dispels Wind-Dampness; Warms the Channels and Alleviates Pain; Dispels Cold and Alleviates Pain; Disperses Swelling and Dissipates Nodules
Traditional Chinese Uses
Zhi Chuan Wu (processed Sichuan aconite root, Aconitum carmichaelii) is an extremely toxic herb that must be carefully processed before use. After processing, it powerfully warms and opens the channels, dispels cold Dampness from deep within the joints and muscles, and relieves severe cold-type bi syndrome with intractable pain, numbness, and restricted movement. Its intense warming action is reserved for cases where cold obstruction is severe and unresponsive to milder herbs, and requires strict professional supervision throughout treatment.
Western Herbalism Properties
Relationships
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Botanical Description
Zhi Chuan Wu is the processed (detoxified) parent (mother) tuberous root of Aconitum carmichaelii, a stout perennial herb in the Ranunculaceae family native to central and eastern China. The plant produces an erect stem 60-150 cm tall bearing dark green palmately divided leaves with 3-5 deeply lobed segments and a terminal raceme of striking helmet-shaped deep blue-purple flowers in late summer and autumn. Below ground each plant has a conical to elongated dark brown tuberous parent root (Chuan Wu) that typically gives rise during the growing season to one or more attached daughter tubers, harvested separately as Fu Zi. The raw parent root contains highly cardiotoxic diester diterpenoid alkaloids (aconitine, mesaconitine, hypaconitine) and must be processed by prolonged boiling, sometimes with adjuncts, to hydrolyse these alkaloids into far less toxic monoester forms before use.
Active Constituents
Aconitine
Diester diterpenoid (C19-norditerpenoid) alkaloidConcentration: 12.6 +/- 4.2 micrograms per gram in processed Chuanwu, against 117.5 +/- 5.0 micrograms per gram in the raw root (Sun et al. 2012) - roughly a 9-fold reduction
The principal toxin of the drug. Aconitine binds neurotoxin site 2 on the alpha-subunit of voltage-gated sodium channels and holds them open, causing persistent sodium influx, calcium overload through the sodium-calcium exchanger, and ventricular arrhythmia; an oral dose of about 0.2 mg can poison an adult and 2-4 mg is reported as lethal. Processing lowers but does not abolish it, which is why correctly processed Zhi Chuan Wu remains a Pharmacopoeia-graded toxic drug with a narrow therapeutic margin.
Mesaconitine
Diester diterpenoid alkaloidConcentration: 23.8 +/- 4.9 micrograms per gram in processed Chuanwu, against 421.5 +/- 48.7 micrograms per gram raw (Sun et al. 2012) - roughly an 18-fold reduction
The most abundant diester alkaloid in the raw mother root and the one most efficiently destroyed by heating, hydrolysing first to the monoester benzoylmesaconine and then, with prolonged heating, to a non-esterified amine alkaloid. Shares aconitine's sodium-channel mechanism and is comparably cardiotoxic at milligram doses.
Hypaconitine
Diester diterpenoid alkaloidConcentration: 38.1 +/- 2.9 micrograms per gram in processed Chuanwu, against 318 +/- 41.0 micrograms per gram raw (Sun et al. 2012) - roughly an 8-fold reduction
The most heat-resistant of the three diesters: Sun et al. found that aconitine and mesaconitine largely converted to their benzoyl analogues on boiling while hypaconitine changed little. It therefore dominates the residual diester load of a correctly processed drug and is the alkaloid most likely to be recovered from a patient who has been poisoned by an under-decocted preparation.
Benzoylaconine
Monoester diterpenoid alkaloidConcentration: One of the three monoesters that the Chinese Pharmacopoeia sets as the potency marker for processed Chuanwu, with the diester total capped at 0.040 percent
Formed when the C8 acetyl group of aconitine is hydrolysed during soaking, boiling or steaming. It is one to two orders of magnitude less acutely toxic than aconitine while retaining anti-inflammatory and analgesic activity, and is the intended active principle of the processed drug rather than a mere degradation artefact.
Benzoylmesaconine
Monoester diterpenoid alkaloidConcentration: Usually the most abundant monoester in the processed root; part of the Pharmacopoeia monoester assay
The hydrolysis product of mesaconitine and the main carrier of the drug's analgesic and anti-inflammatory activity. Zheng et al. showed that honey-boiling encapsulates it in roughly 250 nm supramolecular aggregates that raise its bioavailability while blocking its further hydrolysis to non-esterified alkaloids.
Benzoylhypaconine
Monoester diterpenoid alkaloidConcentration: Third component of the Pharmacopoeia monoester assay for processed Chuanwu
Hydrolysis product of hypaconitine. Because its parent diester resists heat, benzoylhypaconine accumulates more slowly during processing than the other two monoesters.
Aconine
Amine (non-esterified, aminoalcohol) diterpenoid alkaloidConcentration: Accumulates with prolonged heating; the endpoint of the two-step hydrolysis
The second hydrolysis step removes the C14 benzoyl group, giving an essentially non-toxic but also weakly active alkaloid. Over-processing therefore costs potency: honey-boiling is thought to work partly by arresting hydrolysis at the monoester stage rather than driving it all the way to aconine.
Songorine
C20-diterpenoid alkaloidConcentration: Minor alkaloid of the root, measurable in rat plasma after oral Chuanwu extract
A non-ester diterpenoid alkaloid lacking the sodium-channel toxicity of the diesters; Ge et al. tracked it as one of ten marker compounds when studying the Chuanwu-Banxia interaction, and its plasma exposure was altered by co-administered Pinellia.
⚠ Drug Interactions
Raw Chuan Wu (unprocessed Aconitum carmichaelii mother root)
Substituting the raw drug for the processed one is the single most consequential dispensing error possible with this genus. Raw Chuanwu carries roughly 9-fold more aconitine, 18-fold more mesaconitine and 8-fold more hypaconitine than the processed root (Sun et al. 2012), and steaming or stir-frying has been reported to cut diester content by 40-80 times overall. Because the daily dose of the processed drug is set at the top of its own therapeutic window, dispensing raw material at the processed dose delivers a frankly toxic quantity of diester alkaloid. Chen et al. found that 13.5 percent of 52 laboratory-confirmed aconite poisonings in Hong Kong arose from inadequately processed herbs and a further 3.9 percent from outright dispensary error. A related corpus hazard is bibliographic: if a raw aconite record carries a Latin name ending Praeparata or Cocta, the raw and processed drugs become indistinguishable on the label.
Clinical note: Confirm on the label and the invoice that the material is Zhi Chuan Wu (Aconiti Radix Cocta / Radix Aconiti Praeparata) and not Chuan Wu (Aconiti Radix). Decoction time is a second, independent safety variable: boiling for only 30-60 minutes leaves residual toxicity, whereas two hours removed measurable toxicity in the reviewed data, so the drug must be decocted alone for at least 30-60 minutes and preferably longer before the rest of the formula is added. Keep to 1.5-3 g per day. Never dispense as a powder, tincture or pill made from undecocted material.
Antiarrhythmic drugs (amiodarone, flecainide, quinidine, lidocaine, sotalol)
Residual aconitine, mesaconitine and hypaconitine act as sodium-channel agonists, locking the channel open and producing the very arrhythmias that class I and class III antiarrhythmics are given to suppress. Adding a channel-blocking or repolarisation-prolonging drug to a persistent depolarising stimulus gives unpredictable and potentially additive electrophysiological effects, and aconitine-induced arrhythmias are notoriously refractory to conventional antiarrhythmic therapy. European TCM safety guidance lists antiarrhythmic co-medication as a specific hazard for the aconites.
Clinical note: Do not prescribe processed aconite to a patient on antiarrhythmic therapy or with any known arrhythmia, structural heart disease or conduction defect. If aconite poisoning is suspected in such a patient, treat as a cardiology emergency rather than adjusting the herbal prescription.
Digoxin and other cardiac glycosides
Both drug classes converge on intracellular calcium overload in the myocyte - digoxin by inhibiting the sodium-potassium ATPase, aconite alkaloids by driving sodium influx that reverses the sodium-calcium exchanger. The resulting triggered activity and ectopy are additive, and the toxic presentations overlap closely enough (nausea, bradyarrhythmia, ventricular ectopy) that one can mask the other. Co-medication with digitalis is an explicit contraindication in European TCM safety guidance for aconite drugs.
Clinical note: Absolute contraindication. Do not prescribe processed aconite with digoxin or digitoxin. In a patient presenting with arrhythmia on both, obtain a digoxin level and send blood and urine for aconitine alkaloid screening.
Ban Xia (Pinellia ternata)
The Chuanwu-Banxia pair is one of the classical eighteen incompatibilities, and Ge et al. supplied a modern pharmacokinetic mechanism in rats: Pinellia enhanced the absorption of aconitine and benzoylaconine, accelerated the metabolism of mesaconitine, benzoylmesaconine, songorine and fuziline, and altered CYP isoenzyme activity in a five-probe cocktail assay (CYP3A4, CYP1A2, CYP2D6, CYP2C9, CYP2C19). Higher plasma aconitine from the same oral dose narrows an already narrow margin.
Clinical note: Avoid the combination. Where a classical formula appears to pair them, verify the source text and the intended processed forms before dispensing, and do not increase the aconite dose to compensate for the pairing.
CYP3A4 inhibitors (ketoconazole, itraconazole, clarithromycin, ritonavir, grapefruit juice)
Aconitine alkaloids are predominantly metabolised by CYP3A4, and rodent work on aconite herb pairs has shown that manipulating CYP3A activity changes systemic exposure to the toxic alkaloids in the expected direction. Inhibiting that route should therefore raise and prolong exposure to whatever residual diester the processed drug contains. The interaction has not been quantified in humans, but the consequence of a small increase in exposure to a drug with a 0.2 mg toxic threshold is disproportionate.
Clinical note: Treat concurrent strong CYP3A4 inhibition as a reason to withhold aconite rather than to reduce its dose. Ask specifically about azole antifungals, macrolides and antiretrovirals before prescribing.
Honey (as a processing and decoction adjuvant)
Recorded here because it changes the drug rather than merely accompanying it. Wu et al. showed that honey lowered Cmax and AUC for all three diesters while raising them for benzoylaconine and benzoylmesaconine in rat plasma, and Zheng et al. found that honey-boiled Chuanwu forms about 250 nm supramolecular aggregates that encapsulate the monoesters, raise the LD50, and reduce hepatotoxicity and nephrotoxicity in mice. This is the pharmacological content of the classical honey-boiled wutou preparation.
Clinical note: Honey-boiling is a genuine additional safety measure, not a flavouring, but it does not replace correct pao zhi processing or adequate decoction time.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 1.5–3 g | — | — | — | ChP 2020. Must be pre-decocted (先煎) 30–60 min before adding other herbs. Corrected from a generic 9–15 g filler value. |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
The two processed aconites together powerfully dispel wind-cold-damp and relieve pain in stubborn painful obstruction.
Chronic wind-cold-damp obstruction with phlegm and blood stasis in the collaterals. Highly toxic; contraindicated in pregnancy; incompatible with Ban Xia, Gua Lou, Bei Mu, Bai Ji and Bai Lian.
Core pair of a classical formula — Xiao Huo Luo Dan, Tai Ping Hui Min He Ji Ju Fang
Evidence Tier
Moderate evidence · 5 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
1
0 verified · 1 unverified
In vitro / animal
4
2 verified · 2 unverified
Show 4 studies
- Quantitative and Qualitative Analysis of Aconitum Alkaloids in Raw and Processed Chuanwu and Caowu by HPLC in Combination with Automated Analytical System and ESI/MS/MS
- Mechanistic insights into honey-boiled detoxification of ChuanWu: A study on alkaloid transformation and supramolecular aggregation
- Investigation of the drug–drug interaction and incompatibility mechanism between Aconitum carmichaelii Debx and Pinellia ternata (Thunb.) Breit
- The effect of compatibility of Aconiti Radix and honey on the pharmacokinetics of five Aconitum alkaloids in rat plasma
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Quantitative and Qualitative Analysis of Aconitum Alkaloids in Raw and Processed Chuanwu and Caowu by HPLC in Combination with Automated Analytical System and ESI/MS/MS
Analytical comparison of raw and commercially processed Chuanwu and Caowu. In Chuanwu, processing cut aconitine from 117.5 to 12.6 micrograms per gram, mesaconitine from 421.5 to 23.8, and hypaconitine from 318 to 38.1. Controlled boiling experiments at 15, 30, 60, 90 and 150 minutes showed aconitine and mesaconitine disappearing completely by 150 minutes, while hypaconitine changed comparatively little - the quantitative basis for treating decoction time as a safety variable in its own right.
Aconite Poisoning over 5 Years: A Case Series in Hong Kong and Lessons Towards Herbal Safety
Fifty-two laboratory-confirmed aconite poisonings handled by a Hong Kong clinical toxicology laboratory between 2004 and 2009. Neurological toxicity occurred in 94.2 percent, cardiovascular in 88.5 percent and gastrointestinal in 59.6 percent. Causes were overdose (32.7 percent), hidden or inadvertently dispensed aconite (32.7 percent), use of inadequately processed herbs (13.5 percent) and dispensary error (3.9 percent). Inadequate boiling time, leaving the diester alkaloids insufficiently hydrolysed, is identified as a route to poisoning distinct from the processing of the crude drug.
Mechanistic insights into honey-boiled detoxification of ChuanWu: A study on alkaloid transformation and supramolecular aggregation
Honey-boiled and water-boiled preparations of the dried mother root of Aconitum carmichaelii were compared by UHPLC-MS/MS, transmission electron microscopy, LD50 testing and in vitro assays. Honey promoted conversion of diester to monoester alkaloids and then prevented the monoesters hydrolysing further to non-esterified alkaloids, forming roughly 250 nm supramolecular aggregates that encapsulated the monoesters and improved their bioavailability. Honey-boiled Chuanwu raised the LD50 and reduced hepatotoxicity and nephrotoxicity in mice while improving anti-inflammatory and analgesic effects.
Investigation of the drug–drug interaction and incompatibility mechanism between Aconitum carmichaelii Debx and Pinellia ternata (Thunb.) Breit
Rat pharmacokinetic and CYP cocktail study of the classical Chuanwu-Banxia incompatible pair. Pinellia enhanced absorption of aconitine and benzoylaconine, accelerated metabolism of mesaconitine, benzoylmesaconine, songorine and fuziline, and altered CYP isoenzyme activity assessed with dapsone, phenacetin, dextromethorphan, tolbutamide and omeprazole. The authors attribute the classical incompatibility to increased in vivo absorption of the toxic constituents.
The effect of compatibility of Aconiti Radix and honey on the pharmacokinetics of five Aconitum alkaloids in rat plasma
UHPLC-MS/MS comparison of Chuanwu decoction against a Chuanwu-honey concentrated solution in rats. Cmax and AUC fell for hypaconitine, mesaconitine and aconitine in the honey group while Tmax and half-life lengthened; Cmax and AUC rose for benzoylaconine and benzoylmesaconine. The pattern supports honey acting by shifting systemic exposure away from the diesters and towards the monoesters.
⚠ Safety & Contraindications
- Pregnancy
- Heart conditions
- Toxic — professional use only
Contraindications
Contraindicated in pregnancy and in cardiac disease.
Safety Warnings
- Processing lowers but does not remove the toxicity — the Pharmacopoeia still grades the processed root 有毒.
- Decoct first for at least 30 to 60 minutes.
- Incompatible with Ban Xia, Gua Lou, Bei Mu, Bai Lian and Bai Ji.
⚠ Rule-Based Cautions
These entries come from the deterministic rule tables that gate Verscienta's formula tools — classical pair prohibitions, pregnancy and lactation contraindications, and dose ceilings.
Incompatibilities (十八反 / 十九畏)
- 十八反: Wu Tou × Ban Xia — avoid combining with Ban Xia / Pinellia (pair accepted when both members are processed)
- 十八反: Wu Tou × Gua Lou — avoid combining with Gua Lou / Trichosanthes / Tian Hua Fen
- 十八反: Wu Tou × Bei Mu — avoid combining with Bei Mu / Fritillaria / Chuan Bei / Zhe Bei
- 十八反: Wu Tou × Bai Lian — avoid combining with Bai Lian / Ampelopsis
- 十八反: Wu Tou × Bai Ji — avoid combining with Bai Ji / Bletilla
Pregnancy
Avoid toxic aconite
Breastfeeding
Avoid toxic to infant
Dose Ceiling
≤15g — prepared aconite 3–15g and must be pre-decocted; higher risks toxicity
≤6g — raw/less-processed aconite extremely toxic; keep low and pre-decoct
⚠ Toxicity Information
As for the raw root but requiring larger doses: oral and limb numbness, nausea, palpitations and arrhythmia. Most reported poisonings follow inadequate processing or insufficient decoction.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica)
Han dynasty, compiled c. 200 CEJin Gui Yao Lue (Essentials from the Golden Cabinet), Zhang Zhongjing
Eastern Han dynasty, c. 220 CELei Gong Pao Zhi Lun (Master Lei's Treatise on Drug Processing), attributed to Lei Xiao
Southern and Northern Dynasties, c. 5th century CEBen Cao Gang Mu (Compendium of Materia Medica), Li Shizhen
Ming dynasty, 1596References
- Ru Ya Tan; Pin Jun Ooi; Xiangyang Xu; Xu Wei; Xu Wen; Qiyue Qiu; Mun Fei Yam. Aconitum carmichaelii: a clinical-regulatory synthesis of traditional use, toxicological evidence, and global safety governance . Frontiers in Pharmacology (2026) [DOI]
- Xin-Yu Li; Li Zhou; Zhen-Hong Jiang; Yong Liang; Ya-Guo Fan; Zhao-Hui Ding; Hao Chen; Wen-Jun Liu; Xiang Zhou; Huan-Hua Xu. Integrated toxicology of Aconitum carmichaelii Debx.: bridging traditional toxicity-efficacy understanding and modern toxicology . Frontiers in Pharmacology (2025) [DOI]
- Yabin Gao; Hang Fan; Anzheng Nie; Kang Yang; Haiyan Xing; Zhiqing Gao; Liujie Yang; Zheng Wang; Linqi Zhang. Aconitine: A review of its pharmacokinetics, pharmacology, toxicology and detoxification . Journal of Ethnopharmacology (2022) [DOI]
- Weiye Zhang; Zhubin Zhang; Ziwen Bian; Qi Zuo; Xue Quan; Jiahao Gong; Bingling Ju; Liang Feng; Xiaobin Jia; Bing Yang. Processing-induced detoxification of toxic Traditional Chinese Medicines: a systematic review of attenuation mechanisms at physical, chemical, and in vivo levels . Chinese Medicine (2026) [DOI]
- Nicoleta Anca Şuţan; Alina Paunescu; Carmen Topala; Codruţa Dobrescu; Maria Cristina Ponepal; Diana Ionela Popescu (Stegarus); Liliana Cristina Soare; Radu Tamaian. Aconitine in Synergistic, Additive and Antagonistic Approaches . Toxins (2024) [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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