Emergency
Go to a vet now
Go to a vet now. Cats are about twice as sensitive to ibuprofen as dogs, and a single tablet can cause stomach ulcers and acute kidney failure in a cat.
Pet poison lines (US, 24/7): ASPCA Animal Poison Control: (888) 426-4435 · Pet Poison Helpline: (855) 764-7661. Or call your nearest emergency vet.
What to do right now
- Count the missing tablets and note the strength.
- Call your vet or poison control and go in immediately.
- Bring the package.
Why ibuprofen can be dangerous for cats
Cats have limited ability to process many drugs (low glucuronidation), so ibuprofen stays in the body longer. Merck notes cats are affected at about half the dose that poisons dogs.
Symptoms to watch for
- Vomiting (possibly with blood)
- Not eating
- Black, tarry stool
- Increased thirst or reduced urination
- Lethargy
- Wobbliness or seizures (high doses)
What not to do
- Never give a cat any human pain reliever.
What the vet will do
Treatment includes decontamination, stomach protectants and IV fluids for 48-72 hours with kidney monitoring.
Related guides
Cat ate ibuprofen: FAQ
Can one ibuprofen kill a cat?
A single 200 mg tablet is a dangerous dose for an average cat and can cause kidney failure. Prompt treatment greatly improves the outlook.
Other "my cat ate…" guides
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Sources
- Merck Veterinary Manual: Toxicoses From Human Analgesics in Animals
- ASPCA Animal Poison Control Center
This guide is general information, not a diagnosis. Every pet is different: when in doubt, call your vet or an animal poison control line.