Is Monkshood Toxic to Cats?
Also known as: Aconite, Wolfsbane, Devil’s Helmet, Aconitum napellus · Aconitum napellus
What makes it toxic
Aconitine and related diterpene alkaloids in all parts, densest in the root. They keep sodium channels open, causing heart arrhythmias, paralysis of nerves and respiratory failure.
Warning signs to watch for
Numbness and tingling around the mouth, drooling, vomiting, weakness and wobbliness within minutes to an hour, then irregular heartbeat, tremors, paralysis and breathing failure.
What to do if your cat eats it
Life-threatening emergency. Go to a veterinary ER immediately, even before symptoms fully appear, and bring the plant. There is no antidote — only fast supportive care (antiarrhythmics, ventilation) gives a chance.
Common questions
Can one leaf of monkshood really poison a cat?
Yes. Aconitine is one of the most potent plant toxins known, and documented human deaths involved small amounts of leaf or root. A cat’s body mass makes one bite genuinely dangerous.
Is it safe to brush against monkshood?
Alkaloids can pass through skin, and sap on fur gets groomed off. Keep pets out of gardens growing it, and wear gloves when handling the plant yourself.
More plants checked for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.