Monk's-hood (Aconitum napellus) in Cats (Felis) | Vetlexicon
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Monk's-hood (Aconitum napellus)

ISSN 2398-2950


  • Member of the buttercup family.
  • Found in high altitude woodland, damp woods and riverbanks and garden perennial.
  • Grow to about 1.5 m.
  • Unbranched stem.
  • Flowers:
    • June-August.
    • Deep blue-mauve which appear in clusters.
    • 5 uneven petals, with upper petal curved over as a hood.
  • Reputed to be UK's most poisonous plant.


  • Toxic alkaloids, eg aconitine and other similar types.
  • Risk is small as plant is comparatively rare in the wild, although a common garden plant.

Clinical signs

  • Initially, a stimulatory effect on the respiration and circulation, followed by depression until a slow labored breathing and low pulse.
  • Large amounts usually produce sudden death from asphyxia and circulatory collapse.


Further Reading


Refereed papers

Other sources of information

  • Allison K & Day C (1997) A Guide to Plants Poisonous to Horses. British Association of Holistic Nutrition and Medicine.