Cat FIP Treatment: Antiviral Therapy Revolution

Feline infectious peritonitis was once uniformly fatal. Antiviral treatments now achieve remission in over 85% of treated cats, transforming the welfare outlook.

Key Facts

FIP is caused by a mutated form of feline coronavirus that becomes virulent in some cats
GS-441524 and molnupiravir antiviral drugs achieve remission in over 85% of FIP cases
Treatment requires daily injection or tablet administration for a minimum of 84 days
Wet FIP causes effusion and is diagnosed through effusion analysis and PCR
Dry and neurological forms are harder to treat but still respond in the majority of cases

Welfare Considerations

FIP prior to antiviral treatment caused rapid deterioration and death, typically within weeks of diagnosis. The development of effective antivirals represents one of the most significant veterinary welfare advances of the past decade. Cats treated with GS-441524 experience remission and return to normal life in the majority of cases. Treatment requires owner commitment to daily dosing for 84+ days and monitoring including repeat examination and blood work. Early diagnosis improves outcomes — veterinary assessment for any young cat with fever, weight loss or fluid accumulation should include FIP consideration.

What You Can Do

Ask your vet about antiviral FIP treatment immediately if FIP is suspected
Access GS-441524 through your vet or licensed compounding pharmacy where available
Commit to the full 84-day treatment course even if your cat appears recovered
Monitor for relapse signs — repeat bloodwork and physical examination at end of treatment
Join FIP Warriors community for owner support and treatment guidance resources