Is Fluoxetine (Prozac) Safe for Cats?
Why it’s conditional
Fluoxetine is used in cats for inappropriate urination, overgrooming, and anxiety, but cat doses are a fraction of human doses and the margin of safety is small. Accidental human-pill ingestions have been reported to cause tremors, fever, and seizures, so unsupervised use is dangerous even though the drug itself is vet-approved.
How to keep your pet safe
Only a veterinarian should prescribe fluoxetine for a cat. Store human antidepressants in closed cabinets — cats knock bottles off counters and play with loose pills. Never split your own capsules for a pet.
Warning signs to watch for
Vomiting, lethargy or agitation, dilated pupils, tremors, rapid breathing, fast heart rate, fever; severe cases: muscle tremors progressing to seizures.
When to call the vet
Call your veterinarian or a pet poison hotline promptly if your cat swallows any pills. Report the strength and the maximum number possibly eaten, and follow their guidance before doing anything at home.
Common questions
My cat bit into a Prozac capsule — is that dangerous?
It can be — cat doses are tiny, so even partial exposure matters. Call your vet or a pet poison hotline for a weight- and dose-based assessment.
Why do vets give cats fluoxetine if it is an antidepressant?
At cat-specific doses it can help anxiety, overgrooming, and marking. That does not make home use safe — human pills are far too strong and should never be shared.
More medications hazards for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).