Feline infectious peritonitis (FIP) was once universally fatal, but new antiviral treatments now cure most cats — yet diagnosis remains challenging and treatment costs limit access for many cat owners.
FIP causes progressive, painful illness characterised by fever, lethargy, fluid accumulation in body cavities, and neurological signs. Before effective antivirals, cats with FIP were typically euthanised within weeks of diagnosis. The advent of GS-441524 has transformed FIP from a death sentence to a treatable condition for most cats. However, access to this treatment is unequal: licensed versions are expensive, and while compounded or unlicensed versions exist at lower cost, quality and legality vary. Delayed diagnosis prolongs suffering before treatment begins. Support for owners navigating diagnosis, accessing affordable treatment, and completing the full medication course is critical to maximising welfare outcomes for affected cats.