A clear, step by step guide to treating FIP in cats
Feline Infectious Peritonitis (FIP) is a viral infection affecting an estimated 1 to 2 percent of cats each year, and it is fatal if untreated. With early detection and antiviral treatment using GS-441524, survival rates improve significantly. This guide walks you through recognizing, diagnosing, treating, and caring for a cat with FIP.
What this guide covers
Jump to any stage of the treatment journey.
1What is FIP in cats?
Feline Infectious Peritonitis (FIP) is a severe disease caused by the mutation of the Feline Coronavirus (FCoV). FCoV spreads through saliva, feces and urine and is usually harmless, but once it mutates into FIP it is fatal if untreated. Early detection and antiviral treatment change the outcome.
Wet FIP
The more common form, marked by fluid accumulation in the abdomen or chest. Often seen in kittens between 6 months and 1.5 years old.
Dry FIP
Progresses without fluid buildup. Firm nodular structures called granulomas form and can damage organs and tissue. Slower course, subtler symptoms.
Neurological FIP
Affects the nervous system and brain. Signs include wobbliness, loss of coordination, tremors, seizures and changes in behavior.
Ocular FIP
Affects the eyes. Signs include inflammation, cloudiness, color changes in the iris and reduced vision.
FIP can appear in more than one form at once and can progress quickly. Early detection and antiviral treatment give the best chance of recovery.
Recognizing symptoms of FIP
Symptoms vary by form. Wet FIP typically brings fluid buildup with weight loss, poor appetite, vomiting, diarrhea and breathing difficulty. Watch for these common signs.
Diagnosing FIP in cats
Diagnosis can be difficult because symptoms overlap with other diseases. Vets usually combine several of these tests to confirm FIP.
FCoV AB test
Detects antibodies to the coronavirus behind FIP.
Rivalta test
Run when fluid has collected in the abdominal cavity.
Blood panels
Hematology and chemistry confirm albumin, globulin, liver and kidney values.
Ultrasound (USG)
Confirms fluid presence in the abdominal cavity.
Treating FIP with GS-441524
FIP was once considered a death sentence, but that has changed. GS-441524 is an antiviral developed through the research of Dr. Niels Pedersen, and it has become the standard of care for treating cats affected by FIP.
- Clinically studied antiviral with a high success rate when started early.
- Recommended course runs 12 weeks (84 days), adjusted to your cat's response.
- Available as injectables and oral capsules to suit different cats.
when treatment starts early
Care, recovery and prevention
Treatment works best alongside good daily care. Focus on these four areas throughout your cat's recovery.
Nutrition
Feed a balanced, protein rich, low carbohydrate diet. Freshly cooked fish or chicken works well. Keep fresh water available at all times, since cats with FIP dehydrate easily.
Clean environment
Keep litter boxes clean and provide fresh water. A calm, low stress space helps recovery, as cats with FIP are easily overwhelmed.
Prevention
Maintain hygiene, keep vaccinations up to date, and limit contact with unfamiliar cats. Monitor closely after any exposure.
Comfort and monitoring
Give plenty of affection and watch for changes in behavior. Consistent observation helps you catch issues early and adjust care.
Good to know: FIP itself is not transmitted between cats, to other pets, or to humans. The mutation that causes FIP happens inside an individual cat, so you do not need to isolate a cat with FIP from your household on infection grounds.
Common questions about FIP
What should I feed my cat during treatment? +
Freshly cooked fish, chicken and other natural foods. If your cat has diarrhea, consider switching to dry cat food for a few days until it stops.
How long is the treatment? +
The recommended length is 12 weeks (84 days). The actual duration depends on how quickly your cat responds and the stage of infection when treatment began.
Can GS-441524 be used with other medications? +
Yes. GS-441524 is an antiviral and can be combined with other medications to support your cat's overall health. Note that Lysine is not recommended alongside GS-441524.
Can FIP be transmitted to other cats? +
No. A cat with FIP will not transmit FIP to other cats, and it does not spread to other pet species or to humans.
How is FIP related to Feline Coronavirus? +
The underlying virus is Feline Coronavirus (FCoV), which spreads only between cats and not to humans or other species. FCoV is common and usually asymptomatic, sometimes causing mild diarrhea. It is not deadly on its own, but in a small share of cats it mutates into FIP, which is fatal if left untreated.
What is Dry FIP? +
Dry FIP progresses without fluid accumulation. Instead, firm nodular structures called granulomas form and can damage organs and tissue. Its course is usually slower and symptoms milder, but it can still cause serious health problems.
What is Wet FIP? +
Wet FIP is the most common and dangerous form, often occurring in kittens between 6 months and 1.5 years old. It causes fluid to collect in the abdominal and thoracic cavities. The fluid is typically yellowish and sticky.
What are the final stages of FIP? +
FIP has three stages. The final stage is marked by worsening mid-stage symptoms, stopping eating, cloudy eyes, and loss of coordination or paralysis. Early treatment is the best way to avoid reaching this point.
Can FIP in cats be treated? +
Yes. There is an effective treatment for FIP using the antiviral GS-441524, developed through the research of Dr. Niels Pedersen. It has been studied clinically and shown to be effective in treating cats affected by FIP, with a high success rate when started early.
Worried your cat may have FIP?
If your cat is showing signs of FIP, act early, when treatment works best. Check the dosage for your cat's weight or browse the available treatments.
This page is for general educational purposes and does not replace veterinary advice. Always consult a qualified veterinarian for diagnosis and a treatment plan tailored to your cat.
