Step-by-step FIP guide
Your cat has FIP. You're overwhelmed and don't know where to start. This guide takes you from first suspicion to completed treatment, one step at a time.
This guide is for the first days — when everything is uncertain and you need clear, practical next steps. We have designed it to be read in any order depending on where you are in the process.
Don't panic — FIP is treatable
A FIP diagnosis is frightening, but it is no longer a death sentence. Since 2019, antivirals GS-441524 and Molnupiravir have changed everything. Cure rates above 85% in correctly treated cats. Take a breath, and take the next step.
Confirm the diagnosis
Before starting treatment, make sure the diagnosis is solid. Request fluid analysis if there is effusion (Rivalta test, protein ratio, cytology), A:G ratio, and PCR if available. A confident diagnosis prevents spending money on treatment for the wrong disease.
Find a vet experienced with FIP antivirals
Not all vets have experience with GS-441524 or Molnupiravir. Look for one who knows these drugs — many owners in FIP communities can recommend experienced vets in their area. Some owners treat with online vet support.
Determine FIP form and severity
Wet (effusion) or dry? Neurological involvement? Ocular involvement? The answers determine which antiviral, which dose, and which administration route is best. Neurological and ocular forms require higher doses and often injectable GS-441524.
Choose antiviral and source
GS-441524, Molnupiravir, or dual therapy? Which brand? Injectable or oral? Use our dose calculator to understand the amounts, then work with your vet to source from a reputable supplier. Join FIP owner communities for brand recommendations.
Start treatment and monitor
Treatment is 84 days. Most cats show improvement within 1-2 weeks: effusion reabsorbs, appetite returns, energy improves. Track weight weekly. Recheck bloodwork at weeks 4 and 8. If improvement stalls, consult your vet about dose adjustment.
Complete 84 days — do not stop early
Even if your cat looks completely normal at day 40, completing the full 84 days is critical. Early discontinuation is one of the most common causes of relapse. The virus can persist at undetectable levels — the full course ensures it is cleared.
Observation period (84 more days)
After completing treatment, there is an 84-day observation period with no antivirals. Regular vet check-ups are recommended. If no relapse occurs during this period, the cat is considered cured. Relapse rate is approximately 10%.
Celebrate the cure
If no relapse occurs during observation, your cat is cured. Most cured cats live normal, full lives. Join our success stories section and share your cat's journey — it helps give hope to owners just starting.
You don't have to face this alone
Join FIP owner communities worldwide. Thousands of families have been through this and come out the other side.