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Is Oleander Toxic to Cats? Safety Verdict and What to Do

PawAI Lab
4 min read

Learn whether oleander poses a toxicity risk to cats, what signs may appear after exposure, and what immediate steps to take if your cat may have been exposed.

Quick Answer

Yes, oleander is toxic to cats. Plants include foxglove, oleander, lily of the valley, and kalanchoe. All parts are toxic, even dried. If your cat may have been exposed, contact a veterinarian or animal poison-control service right away, even if no signs are visible yet.

Before using any tool, contact a veterinary professional if your cat may have been exposed.

  • US: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • UK: Animal PoisonLine (01202 509000) or your nearest veterinary emergency clinic
  • Canada: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • AU: Animal Emergency Centre or your regular vet
  • EU: Contact your nearest veterinary emergency service

TOXICITY CHECKER

Check whether a substance may be harmful to your pet and get prioritized safety steps.

Check Toxicity

This tool provides general safety information and does not replace veterinary advice in an emergency.

Safety Verdict

Toxic. Cardiac glycosides inhibit the sodium-potassium ATPase pump, increasing intracellular calcium. This increases cardiac contraction force but disrupts electrical conduction, causing dangerous arrhythmias.

Plants include foxglove, oleander, lily of the valley, and kalanchoe. All parts are toxic, even dried.

What It Is

Oleander contains potent cardiac glycosides that affect the heart. All parts are extremely toxic, even dried. A single leaf may contain enough toxin to be dangerous.

Why It May Be Harmful

The toxic principle in oleander is cardiac glycosides (digoxin-like compounds). Cardiac glycosides inhibit the sodium-potassium ATPase pump, increasing intracellular calcium. This increases cardiac contraction force but disrupts electrical conduction, causing dangerous arrhythmias.

Signs of toxicity may include:

  • Vomiting
  • Diarrhea
  • Drooling
  • Loss of appetite
  • Lethargy and weakness
  • Irregular heart rate
  • Collapse
  • Death in severe cases

Timeline: Signs typically develop within a few hours.

Life-threatening. Can cause fatal cardiac arrhythmias.

What to Do If Your Cat Eats It

  1. Contact a veterinarian or animal poison-control service immediately.
  2. Remove any remaining substance from your cat's reach.
  3. Do not induce vomiting unless instructed by a veterinarian.
  4. Do not give food, milk, charcoal, or home remedies.
  5. Bring the substance, plant, or packaging for identification.

Information to have ready when you call:

  • Your cat's age, approximate weight, and any health conditions
  • The name or type of oleander and the estimated amount consumed
  • When the exposure likely occurred
  • Any current symptoms your cat is showing
  • The product packaging or a photo of the plant if applicable

Any ingestion should be treated as an emergency. Do not wait for signs.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service immediately if your cat may have been exposed to oleander. Do not wait for symptoms to develop.

Emergency signs that require urgent veterinary attention:

  • Irregular heart rate
  • Collapse
  • Difficulty breathing
  • Persistent vomiting
  • Pale gums

Non-urgent follow-up: Any ingestion should be treated as an emergency. Do not wait for signs.

FAQ

Which plants contain cardiac glycosides?

Foxglove, oleander, lily of the valley, and kalanchoe all contain cardiac glycosides. All parts are toxic.

How much is toxic to a cat?

Even a small amount can be dangerous. A single oleander leaf may contain enough to cause toxicity. Any ingestion is an emergency.

Can cardiac glycoside poisoning be treated?

Treatment may include activated charcoal, IV fluids, anti-arrhythmic medications, and monitoring. Prognosis depends on dose and speed of treatment.

TOXICITY CHECKER

Concerned about another plant, food, medication, or household item around your cat? Get general, species-aware safety information to help you decide your next step.

Try Toxicity Checker

This tool provides general safety information and does not replace veterinary advice.

Sources

Disclaimer

This article and the PawAI Toxicity Checker tool provide general safety information and do not replace examination, diagnosis, or treatment by a licensed veterinarian. If your cat may have ingested a toxic substance, contact a veterinarian, emergency clinic, or animal poison control immediately.