Have Cat Questions? Ask a Cat Vet Online.
Hello, this is Dr. Jess. I am sorry to hear about your situation! Unfortunately Advil can be quite toxic to cats. The safest thing to do if you think he ingested this pill is to get him to an emergency clinic ASAP so that they can induce vomiting and treat him for possible toxicity.
If it is just one advil, and your cat is larger than 5 pounds, hopefully it will just be gastrointestinal side effects that could result from this ingestion. But is is possible to see kidney toxicity in ibuprofen ingestion. Most commonly it would be seen in a cat ingesting more than 88mg per kg of body weight of ibuprofen, but some may be more sensitive than others and so it is best to play it safe by taking them in for exam and treatment if needed.