My name is***** and I am sorry to hear that your cat ate the Fluoxetine. This drug is a serotonin re-uptake inhibitor and can cause serotonin syndrome in cats. Serotonin Syndrome is when a cat has too much serotonin and they become "crazy", extremely hyperactive, vocalizing, drooling, loss of urine control and high heart rate.
If your pet was a dog, I would recommend trying hydrogen peroxide to make them vomit, but this is usually very unsuccessful in cats. If you want to try, give 1-2 teaspoons by mouth to see if this will induce vomiting.
While you are waiting for your kitty to vomit I would recommend calling the ASPCA Animal Poison Control. They are your best resource for any animal poison-related emergency, 24 hours a day, 365 days a year. If you think that your pet may have ingested a potentially poisonous substance, call (888)(###) ###-####/strong>. A $65 consultation fee may be applied to your credit card. They will ask you the name of the product as well as any listed ingredient and will tell you if the product is toxic and if you should rush your pet to the nearest veterinarian.
They may recommend taking your kitty to the local animal emergency room this evening for more care.
I hope this answer helps you. Feel free to contact me if you have any further questions.
Kansas State University
College of Veterinary Medicine Class of 2001