Monkshood

Aconitum napellus L.

Plant family:
Ranunculaceae

Other significant names: Wolf’s bane

Parts used: Radix

Common forms of prescription: Tincture for cream

Restriction: The Human Medicines Regulations 2012, Schedule 20, Part II

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If you think you’ve swallowed Aconitum napellus (monkshood):

  • Call emergency services immediately (UK: 999 or 112). Do not wait for symptoms.

  • Do not induce vomiting. Rinse your mouth and spit out the water.

  • Do not eat or drink anything unless a medical professional tells you to.

  • Keep any plant material/packaging and take it with you.

  • Watch for tingling or numbness (mouth/face/hands), dizziness, nausea/vomiting, palpitations, chest pain, weakness, or confusion.

  • If symptoms are mild and you’re unsure, call NHS 111 for urgent advice, but if any symptoms are present or ingestion is likely, treat it as an emergency (999/112).

This website is for educational purposes only and is not medical advice. Aconitum species are highly toxic.

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Monkshood (Aconitum napellus) - Clinical Snapshot

(Educational purposes only)

Primary Actions

Analgesic

Primary Indications

Topical use only.

For tingling or numbing sensations associated with pain, such as:
• Arthritic and rheumatic pain
• Sciatica
• Neuralgia (including facial neuralgia)
• Gout

Qualities: Hot, dry.

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Traditional & historical use of Aconite (Aconitum napellus)

Aconite has always lived in that uneasy space between medicine and menace. In the old herbals, it isn’t introduced as a cosy “kitchen-garden remedy”, but as a plant whose beauty hides real danger, so much so that it earned a long list of warning-heavy folk names: Monkshood, Friar’s Cap, Auld Wife’s Hud, Blue Rocket, and the chilling Wolf’s-bane. Traditionally, aconite was known across the cooler mountain regions of the Northern Hemisphere, with accounts tracing it from the Himalayas through Europe and into Britain. In England, it was considered an early arrival rather than truly native, yet it appears surprisingly early in early plant lists and medical recipes.

The name-story is as sharp as the plant itself. Older writers link “Wolf’s-bane” to the ancient idea that aconite was used to kill wolves, and they connect it to the Greek term often translated as “wolf-slayer.” Another strand of tradition ties aconite to weapons: it was said to be used to poison arrowheads or darts, an origin story echoed in how people explained the plant’s Latin and Greek names. Even the species name napellus was explained as a nod to the root’s shape, likened to a small turnip. And by the Middle Ages, its hooded flower gave rise to the familiar “monk” and “helmet” imagery, so common, the texts note, that it was the ordinary name in Shakespeare’s day.

Classical and medieval lore painted aconite as a plant of dark myth. Traditional stories placed it in the orbit of Hecate, underworld imagery, and legendary poisons, tales that weren’t “clinical evidence” even then, but they reveal how deeply feared aconite was. Later folklore wandered further into the strange: aconite was sometimes linked with the idea of “witches’ flying ointments”, grouped with other notorious plants. Aconite wasn’t a casual herb people took lightly; it was treated as something powerful enough to inspire cautionary myth.

Despite that reputation, aconite did enter formal medicine in tightly controlled ways. Historical accounts describe it as an anodyne (pain-relieving) plant, most often appearing in external preparations used for neuralgia-type pains and rheumatic discomforts. Older pharmacopoeial-style writing also describes physicians using aconite preparations in attempts to influence the pulse in certain acute conditions, reflecting a time when practitioners experimented with potent drugs to “manage” feverish states and inflammation. Even the texts themselves acknowledge a critical problem: aconite preparations could vary greatly in strength depending on the species, the root, and how it was obtained, one reason it became a plant associated with professional control rather than household use.

The herbals also record why aconite’s fear-factor never went away: accounts repeatedly emphasise that all parts are poisonous, especially the root, and that poisoning may begin with distinctive sensations like tingling and numbness, followed by escalating systemic effects. They include stark warnings about accidents, particularly the risk of mistaking the root for edible roots (such as horseradish) and the danger of keeping it near food herbs. In other words, aconite’s “traditional use” story is inseparable from its toxicity story: it’s a plant historically approached with awe, caution, and a very clear understanding that mistakes can be catastrophic.

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Botany & identification (Monkshood / Aconite)

Aconite is a hardy perennial with a strong, upright habit and a flower that’s almost impossible to forget once you’ve seen it. The classic garden monkshood (A. napellus) is best recognised by its deeply cut leaves and its dramatic hooded, helmet-like blooms in rich blue-purple tones.