Is Naproxen (aleve) safe for Cats?
✓ Sources checked by the Eaoae Safety Review · 2026-10-28 · Based on 3 sources
No, naproxen (Aleve) is unsafe for cats. Cats are even more sensitive to NSAIDs than dogs: small doses cause stomach ulceration, kidney failure, and signs can be delayed and keep evolving over days.
🚨 Emergency: Yes — contact your veterinarian immediately.
💡 Why
Cats' limited ability to metabolize NSAIDs makes naproxen exceptionally hazardous for them. Even a fraction of a tablet can ulcerate the GI tract and shut down the kidneys. The danger window extends for days, with signs -- vomiting, bloody stools, lethargy, increased thirst -- sometimes appearing late. There is no safe naproxen dose for cats; it should never be administered and accidental ingestions are emergencies.
🩺 What to do
- Keep all human painkillers locked away from cats.
- Any suspected ingestion is an emergency -- call your vet at once.
- Never give human NSAIDs to cats for any reason.
❓ Common questions
Can cats ever take naproxen?
Absolutely not -- there is no safe naproxen dose for cats. Use only vet-prescribed feline pain relief.
What are the signs?
Vomiting, bloody or dark stools, lethargy, loss of appetite, increased thirst/urination as kidneys fail.
What will the vet do?
Immediate decontamination, GI protection, IV fluids, and extended monitoring.
📚 Sources
- Pet Poison Helpline: Naproxen
- Pet Poison Helpline: Top 10 Human Medications Poisonous to Pets
- Toxicoses From Human Analgesics in Animals
- Household Hazards - Toxic Hazards for Cats
- Pet Poison Helpline: NSAIDs
🔎 How the sources compare
What each authority says about Naproxen (Aleve) \u2014 compiled 2026-10-28. Eaoae’s verdict summarizes these sources; it is not our own diagnosis.
| Source | Dogs | Cats | Dose info |
|---|---|---|---|
| ASPCA Animal Poison Control | Not covered | Ibuprofen and naproxen can be quite toxic to cats. If eaten, signs and symptoms can include vomiting, diarrhea, gastrointestinal ulcers and kidney injury; even a small amount of these medications can cause big problems for cats. | — |
| Pet Poison Helpline | Naproxen (Aleve) is named among the NSAIDs that top PPH's list of human medications poisonous to pets: while these medications are safe for people, even one or two pills can cause serious harm to a pet, and dogs may develop significant stomach and intestinal ulcers as well as kidney failure. | Naproxen (Aleve) is named among the NSAIDs that top PPH's list of human medications poisonous to pets: even one or two pills can cause serious harm, and cats may develop significant stomach and intestinal ulcers as well as kidney failure. | Even one or two pills can cause serious harm (no mg/kg figure given) |
| Merck Veterinary Manual | In dogs, naproxen at 5.6 mg/kg/day for 7 days caused vomiting, tarry feces, pallor and weakness, and a single 35 mg/kg dose caused listlessness, abdominal pain, vomiting, hematemesis, diarrhea and melena. Naproxen's half-life in dogs is long, at 74 hours. | Cats may be more susceptible to naproxen than dogs because of their limited glucuronide conjugation capacity. | Dogs: signs after 5.6 mg/kg/day for 7 days, after 11.1 mg/kg/day for 3 days, and after a single 35 mg/kg dose; no cat-specific dose given |
| VCA Hospitals | Naproxen (Aleve) is named among the human over-the-counter NSAIDs that are dangerous for dogs and have a narrow safety margin, meaning that for some medications, even a fraction of a pill may cause severe signs. | Naproxen (Aleve) is named as a human NSAID in VCA's toxic hazards guide for cats, which says these medications are some of the deadliest for cats because of cats' decreased ability to metabolize them; in toxic doses they can result in kidney failure and stomach ulcers. | — |
| Eaoae summary (cats) | ⛔ Unsafe \u2014 Known to be harmful or toxic. Keep it away from your pet. | ||
🔗 Related checks for cats
- Chicken ✅ Safe
- garlic ⛔ Unsafe
- Fly agaric mushroom (Amanita muscaria) ⛔ Unsafe
- tea tree oil ⛔ Unsafe
- Peas ⚠️ Caution
- Antifreeze ⛔ Unsafe
Checked with Eaoae’s safety lookup. Answers are generated for reference and may be incomplete — always confirm with your vet for your individual pet. Spotted an error? Let us know.
