Naproxen Toxicity Symptoms in Pets 

We all know the common toxins to pets, such as chemicals or poisons, but have you thought of the dangers that are lurking in your medicine cabinet? Naproxen, better known as Aleve, is a common over the counter medication that is in many people’s homes. Naproxen is a NSAID, non-steroidal anti-inflammatory medication, that alleviates pain, inflammation, and fever. These medications are safe for use in humans, but they are poisonous to both dogs and cats. Just one tablet can cause severe poisoning and possible death.  

The Risks of Naproxen 

Naproxen can pose a serious threat to our beloved pets. Dogs and cats are particularly vulnerable to the effects of Naproxen, which can lead to gastrointestinal ulcers, kidney damage, and potentially fatal complications. Naproxen is a long-acting drug, meaning it can take effect 1 to 2 hours after ingestion and stay in the system for an extended period of time. Knowing the risks and taking precautions to avoid NSAID poisoning is essential to keeping our pets safe. Always consult your veterinarian before administering any medication to your pet to determine if it’s the right choice for your furry friend.  

Clinical Signs of Naproxen Poisoning 

As a pet owner, you must monitor your pet’s environment and make sure they’re not consuming anything that can be harmful to them. If your pet ingests Naproxen, they can experience a range of harmful symptoms. Potential signs of Naproxen toxicity include: 

  • Abdominal pain 
  • Lack of appetite 
  • Weakness 
  • Vomiting 
  • Pale gums 
  • Lethargy 
  • Bloody stools 
  • Diarrhea 
  • Increased drinking and urination due to kidney failure 


Contact your veterinarian and Pet Poison Helpline at (855) 764-7661 for life-saving advice if your pet has ingested Naproxen. Take your pet to the veterinary clinic so they can receive prompt treatment. Treatment will depend on the dosage, your pet’s health condition and size, and the severity of the presented symptoms. Activated charcoal may be given to bind the toxins. IV fluids will flush the system and aid in hydration. Specific medications may be given to counteract the adverse effects of Naproxen. It’s key to seek treatment as soon as you suspect that your pet ingested Naproxen so they can have the best chances at recovery.