My cat ate flea and tick medicine—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. These medications are toxic to cats and can cause vomiting, drooling, seizures, weakness, agitation, or difficulty breathing.

What to do right now

  1. Call your vet or nearest emergency vet.
  2. Note what, how much, and when was eaten.
  3. Bring the packaging and keep your cat calm.
  4. Remove any medication left.

Don't

  • Don't make your cat vomit unless a vet tells you to.
  • Don't give any human medicine.

Why it can be dangerous

Most common flea and tick medications are topical drugs applied to the skin over the neck or back and contain pyrethrins or pyrethroids.[1] Pyrethrins come from the Chrysanthemum flower or plant, while pyrethroids are synthetic derivatives.[1]

Signs to watch for

  • Vomiting
  • Drooling
  • Seizures
  • Weakness
  • Agitation
  • Difficulty breathing

Where it is found

  • Skin over the neck or back
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 is dangerous?

Call your vet today for advice about how much was eaten.

Which signs should I watch for?

Vomiting, drooling, seizures, weakness, agitation, and difficulty breathing.

How soon can signs start?

Call your vet today rather than waiting for signs.

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

The same page for dogs →

Other things cats eat