Monkshood (Aconitum napellus): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does monkshood (Aconitum napellus) affect the body?

Monkshood contains aconitine alkaloids that bind to voltage-gated sodium channels in nerve and cardiac tissue, keeping them in an open state. This causes prolonged depolarization, leading to neurological symptoms like numbness and tingling, and potentially fatal cardiac arrhythmias. The extreme toxicity limits therapeutic use to highly diluted homeopathic preparations only (Evidence Level C).

Does monkshood interact with heart medications?

Monkshood poses severe interaction risks with cardiac medications. Its aconitine content can cause fatal arrhythmias, which may be compounded by antiarrhythmic drugs, digoxin, or beta-blockers. It should never be combined with any cardiovascular medications. Due to extreme toxicity, no internal use is recommended except under qualified homeopathic supervision (Evidence Level C).

What is a safe dosage of monkshood?

There is no established safe internal therapeutic dose for monkshood. The plant contains lethal amounts of aconitine, with small quantities potentially fatal. Traditional Chinese medicine uses processed aconite (Fuzi) with strict preparation methods to reduce toxicity. Modern use is restricted to homeopathic preparations prepared according to established protocols. Internal use of raw plant material is contraindicated (Evidence Level C).

Is monkshood safe to use during pregnancy?

Monkshood is absolutely unsafe during pregnancy. The aconitine alkaloids can cross the placenta and cause fetal harm, including cardiac arrhythmias and potential fetal death. The plant is contraindicated for all internal use, and even skin contact with the sap should be avoided. Pregnant women should avoid all exposure to this plant (Evidence Level C).

What was monkshood used for in traditional medicine?

Historically, monkshood was used as an analgesic for neuralgia and severe pain, and in traditional Chinese medicine as processed aconite (Fuzi) for warming the body and supporting cardiac function. Western medicine historically used it for cardiac arrhythmias. However, due to extreme toxicity and risk of fatal poisoning, modern therapeutic use is restricted to homeopathic preparations (Evidence Level C).

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Monkshood (Aconitum napellus) is a highly toxic plant containing potent alkaloids that can cause severe cardiovascular and neurological effects [PMID: 19401984, PMID: 26227030].

Background

Aconitum napellus, also known as wolfsbane or aconite, is a member of the Ranunculaceae family and is considered one of the most poisonous plants growing in Europe [PMID: 19679935, PMID: 28886613].

Traditional uses

It has been used in Oriental and homeopathic medicine as analgesics, febrifuges, and hypotensives [PMID: 19679935]. In Ayurveda, it is used for the cure of ailments including rheumatoid arthritis, sciatica, and gout [PMID: 32015952]. Processed lateral roots (Fuzi) are used in traditional Chinese medicine to treat shock from acute myocardial infarction, low blood pressure, coronary heart disease, and chronic heart failure [PMID: 25479152].

Active compounds

The plant contains highly toxic alkaloids in all parts, including aconitine, mesaconitine, hypaconitine, and jesaconitine [PMID: 26227030]. It also contains C19 and C20-diterpenoid alkaloids, phenylpropanoids, flavonoids, terpenoids, and fatty acids [PMID: 37193333].

Mechanism of action

Aconitine acts as a neurotoxin that affects excitable cells, specifically neurons and myocytes [PMID: 19679935, PMID: 23763930].

Clinical evidence

Evidence BPrimary dysmenorrhea

Fu's subcutaneous needling combined with monkshood cake-separated moxibustion was evaluated for clinical efficacy [PMID: 39111789]

Evidence DDiabetes (Animal Model)

Standardized dried tuber extract showed antidiabetic activity and increased body weight in streptozotocin-induced diabetic rats [PMID: 32015952]

Evidence DRheumatoid Arthritis (Animal/In Vitro)

Higenamine (an extract from Monkshood) inhibited M1 macrophage expression and promoted M1 to M2 transition, alleviating arthritis symptoms in collagen-induced arthritis mice [PMID: 40441469]

Evidence DFever (Animal Model)

Homeopathic ultrahigh dilutions (200c and 1000c) significantly reduced temperature in Baker's yeast-induced fever in rabbits, though effects were slower than standard medicine [PMID: 28494851]

Safety & adverse effects

Monkshood is highly toxic and can be lethal; the lethal dose in adults is estimated at 2-6 mg [PMID: 23763930, PMID: 28886613]. Symptoms of intoxication include paraesthesia of the mouth and throat, abdominal cramps, nausea, vomiting, severe skeletal muscle pain, hypotension, and severe ventricular tachyarrhythmias [PMID: 19785799, PMID: 28886613]. Death may occur within hours due to respiratory distress or cardiac arrhythmia [PMID: 28886613].

Evidence summary

The evidence consists primarily of toxicological case reports, in vitro/animal studies, and a few small-scale clinical trials or homeopathic studies. There is strong evidence regarding its high toxicity and cardiovascular risks, but limited high-level clinical evidence for its therapeutic use in humans.

PubMed sources

1.PMID: 35140011 (2022) — Poisoning by Plants. · Deutsches Arzteblatt international
2.PMID: 19401984 (2009) — [Intoxications with plants]. · Therapeutische Umschau. Revue therapeutique
3.PMID: 26227030 (2014) — Tetrodotoxin-Medicated Delay in Aconitine Toxicity: A Murder in Okinawa. · Forensic science review
4.PMID: 32168878 (2020) — RETRACTED: Neuroprotective Effects of Dried Tubers of Aconitum napellus. · Plants (Basel, Switzerland)
5.PMID: 25479152 (2015) — A review on phytochemistry and pharmacological activities of the processed lateral root of Aconitum carmichaelii Debeaux. · Journal of ethnopharmacology
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Monkshood

Sources & Citations

Calculate a safe dose of Monkshood