My cat ate Pimobendan – what should I do?

Updated 2026-09-30 · 1 sources

Based on: Pet Poison Helpline

Call a vet today

Call your vet today for advice – don't wait until signs appear. Pimobendan is toxic to cats.

What to do right now

  1. Call your vet or the nearest emergency vet.
  2. Note what was eaten, how much, and when.
  3. Bring the packaging.
  4. Keep your cat calm and remove what is left.

Don't

  • Do not make your cat vomit unless a vet tells you to.
  • Do not give any human medicine.

Why it can be dangerous

Pimobendan is a common veterinary heart medicine.[1] It increases the contraction of the heart and allows blood vessels to dilate.[1]

Signs to watch for

  • Lethargy
  • Weakness
  • Collapse
  • Elevated heart rate
  • Low blood pressure

Where it is found

  • Veterinary heart medicine
If your pet is struggling to breathe, has collapsed, is having a seizure or can't stand up: go to the nearest vet now.

Not sure how serious it is?

OkPaw asks a few quick questions about your pet and tells you in 30 seconds whether it can wait. Free on Google Play for Android.

Get it on Google Play

OkPaw is on Android now – an iPhone version is on its way.

Common questions

How much Pimobendan is dangerous for a cat?

Pimobendan is available as chewable tablets in 1.25, 2.5, and 5 mg sizes. Note how much was eaten and contact your vet.

Which signs should I watch for?

Possible signs include lethargy, weakness, collapse, elevated heart rate, and low blood pressure.

What should I do now?

Call your vet or the nearest emergency vet, note what, how much, and when, and bring the packaging.

Sources

  1. Pet Poison Helpline

How this page was made: written with the help of AI from the sources below, then checked claim by claim against those sources. Urgency levels follow OkPaw’s fixed safety rules. It is guidance, not a diagnosis. How we write our pages

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