Companion Cats and Feline Infectious Peritonitis

FIP, long considered a uniformly fatal disease in cats, now has an effective antiviral treatment — but access barriers mean many cats still die from a now-treatable condition.

Key Facts

Feline infectious peritonitis is caused by a mutated form of feline coronavirus
FIP previously killed virtually 100% of affected cats within weeks to months
GS-441524, an antiviral drug, cures FIP in over 85% of treated cats
The drug is widely available in Asia but expensive and not FDA-approved in the US
Treatment typically costs $5,000-$10,000 per cat in countries without generic access

Welfare Considerations

FIP causes severe suffering — abdominal fluid accumulation, neurological dysfunction, fever, and organ failure in progressively deteriorating cats. Before GS-441524, veterinarians could only manage symptoms until humane euthanasia. The existence of an effective treatment transforms the welfare calculus: cats dying of FIP in countries with limited drug access are dying of a treatable disease. Access barriers caused by regulatory and pricing structures mean preventable suffering continues for thousands of cats annually.

What You Can Do

Advocate for FDA approval of GS-441524 or equivalent antivirals for cats in the US
Support organizations providing financial assistance for FIP treatment costs
Raise awareness among cat owners that FIP is no longer automatically fatal
Consult specialist veterinarians about accessing treatment through legal import channels
Donate to FIP research and advocacy organizations working to improve drug access