Is Clonazepam (Klonopin) Safe for Cats?
Why it’s a problem
Cats clear benzodiazepines poorly, and oral forms of this drug class have been associated with sudden liver failure in cats. Even a single tablet can cause hours of deep sedation with slow breathing. Some cats react oppositely and become frantic or aggressive.
How to keep your pet safe
Keep clonazepam and other benzodiazepines in closed storage, not in bags or on bedside tables. If your cat panics at vet visits or travel, ask your veterinarian for cat-safe options.
Warning signs to watch for
Extreme lethargy, wobbliness, drooling, vomiting, slow breathing, low temperature; paradoxical hyperactivity or aggression; delayed signs: yellow gums or eyes from liver damage.
When to call the vet
Contact your veterinarian or a pet poison hotline immediately. Cats exposed to benzodiazepines may need bloodwork to monitor liver values even after they seem to recover.
Common questions
My cat bit into a clonazepam tablet — what do I do?
Call your vet or a pet poison hotline right away. Cats are unusually sensitive to this drug, and delayed liver injury has been reported even after apparent recovery.
Can cats take benzos for anxiety?
Some are used only under strict veterinary supervision, but several are considered risky in cats. Never share your own prescription — ask your vet instead.
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).