Is Digoxin (Lanoxin) Safe for Cats?
Why it’s a problem
Cats are sensitive to digoxin, and the margin between helpful and harmful amounts is thin. Overdose can trigger irregular heart rhythms, kidney injury, and severe gastrointestinal damage. Because cats hide weakness, serious poisoning may be well advanced before it is obvious.
How to keep your pet safe
Store digoxin in a closed cabinet away from counters, and clean up dropped tablets immediately. Never dose a cat from a human prescription, even if the cat has diagnosed heart disease — vets use feline-specific dosing with blood monitoring for good reason.
Warning signs to watch for
Vomiting, drooling, loss of appetite, hiding, weakness, slow or irregular heartbeat, cold paws, collapse.
When to call the vet
Call your veterinarian or a pet poison hotline immediately, before symptoms begin, and bring the medication container with timing notes. Continuous ECG monitoring is often needed — this is hospital-level care, not home care.
Common questions
Is digoxin ever used in cats?
Yes, some veterinary cardiologists prescribe it for specific feline heart conditions, but with cat-specific dosing and blood monitoring. Human tablets and self-dosing are a different, dangerous matter.
How fast does digoxin poisoning develop in cats?
Stomach and heart signs can appear within hours, and they can worsen as levels rise. Call your vet or a pet poison hotline the moment you suspect exposure.
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).