Naproxen for a Cat

Naproxen is the active ingredient found in some over-the-counter pain relievers. Medicines containing naproxen should not be given to cats because it can make them sick. A cat's body cannot properly digest the medicine, according to The Merck Veterinary Manual.

  1. Naproxen Poisoning

    • An overdose of naproxen in cats can cause sudden illness and in some cases death. According to the ASPCA Animal Poison Control Center, anti-inflammatory medicines, such as those containing naproxen, are the most common cause of poisoning in small animals. "Pets are extremely sensitive to their effects, and may experience stomach and intestinal ulcers and---in the case of cats---kidney damage," according to the ASPCA.

    Symptoms

    • Identifying naproxen poisoning can be somewhat tricky. Cats may show some of the same symptoms with other illnesses---loss of appetite or vomiting, dehydration or may appear weak and lethargic. Cats showing these signs should be examined by a veterinarian.

    What to Do

    • If a cat eats a pill containing naproxen, call a veterinarian right away. A pet can appear normal immediately after eating naproxen but the effects can show up later. Take the container with the medicine to the vet's office, so he can see exactly what the cat ate. The vet will likely draw and test the cat's blood to determine the proper treatment.