Is Acetaminophen (Tylenol, Paracetamol) Safe for Cats?
Why it’s a problem
A cat’s liver cannot process acetaminophen at all. The drug turns the blood unable to carry oxygen (methemoglobinemia) and destroys the liver. One 500 mg tablet is often fatal to an average cat, and there is no safe fraction.
How to keep your pet safe
Never give any paracetamol product to a cat, in any amount, for any reason. Store all medicines in closed drawers — a cat’s curiosity plus a dropped tablet is a common poisoning story.
Warning signs to watch for
Blue or brown gums and tongue, weakness, fast breathing, facial swelling, vomiting, hypothermia, collapse — signs can appear within hours.
When to call the vet
This is a life-threatening emergency. Go to a vet immediately — early treatment with N-acetylcysteine can save a cat, delay often cannot.
Common questions
My cat licked a tiny crumb of a Tylenol tablet.
Treat it as an emergency and call immediately. Cats have died from a fraction of one tablet, and the antidote only works early.
Why is acetaminophen so much worse for cats than dogs?
Cats lack the liver enzymes needed to clear the drug, so it stays active far longer and poisons the blood and liver at very low doses.
More medications hazards for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).