Is Naproxen (Aleve) Safe for Cats?
Why it’s a problem
Cats clear NSAIDs like naproxen extremely slowly, so the drug builds up in their system. It causes stomach and intestinal ulcers and can rapidly shut down the kidneys. Because cats are small, even licking a crumbled tablet or receiving a dose meant for another animal can be fatal.
How to keep your pet safe
Keep all human painkillers stored away from curious cats and never use naproxen on or for a cat. If your cat seems painful, ask your vet about feline-appropriate pain management — cats have very few safe options and these require strict veterinary supervision.
Warning signs to watch for
Vomiting (possibly with blood), drooling, refusal to eat, belly pain, extreme lethargy, hiding; later signs include weakness, dehydration, and little or no urine from kidney failure.
When to call the vet
Contact your veterinarian or a pet poison hotline immediately — cats can deteriorate quickly with NSAID poisoning. Do not induce vomiting at home unless a professional directs you to.
Common questions
My cat licked a crushed Aleve pill — should I worry?
Yes, this is an urgent situation. Cats are so sensitive to naproxen that even a small amount can trigger fatal kidney failure. Call a vet or pet poison hotline now.
Why are cats so much more sensitive to naproxen than dogs?
A cat’s liver clears NSAIDs very slowly, so the drug accumulates instead of leaving the body. That is why naproxen is more dangerous to cats than to dogs, and dogs are already at serious risk.
Can a cat survive naproxen poisoning?
Some cats survive with very early aggressive treatment, but many do not, especially once kidney failure has developed. That is why immediate contact with a veterinarian matters so much.
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).