This is not veterinary advice. Contact a vet for emergencies. Created with lived experience, not veterinary endorsement.
BLUF: Immediate triage evaluation for FIP to determine required emergency protocols. This condition requires rapid diagnosis and immediate access to modern therapeutics; review symptoms and consult a vet immediately.

Table of Contents

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FIP (Feline Infectious Peritonitis) Triage

Feline Infectious Peritonitis (FIP) was historically considered a 100% fatal diagnosis. Today, with the availability of antiviral treatments like GS-441524, FIP is highly treatable. However, because FIP progresses rapidly, immediate triage and starting treatment early is critical to your cat's survival.

Go To Vet NOW

  • Abdominal swelling (fluid buildup)
  • Persistent high fever unresponsive to antibiotics
  • Severe lethargy and weakness
  • Yellowing of the eyes or skin (jaundice)
  • Neurological symptoms like stumbling or seizures

Immediate Care Guides

Download our comprehensive step-by-step emergency care protocols.

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Recommended FIP Recovery Essentials

FIP treatment requires precise dosage tracking and supportive care. These items are indispensable during the 84-day antiviral protocol.

High-Precision Digital Baby Scale

Antiviral dosage (GS-441524) is strictly weight-dependent. Weighing your cat daily ensures precise therapeutic doses.

View on Amazon →

Tomlyn High-Calorie Nutritional Gel

FIP cats experience rapid muscle wasting. High-calorie gels supply essential vitamins and energy to combat wasting.

View on Chewy →

We earn a commission if you make a purchase, at no additional cost to you. Always consult your vet.

Recommended FIP Recovery Essentials

FIP treatment requires precise dosage tracking and supportive care. These items are indispensable during the 84-day antiviral protocol.

High-Precision Digital Baby Scale

Antiviral dosage (GS-441524) is strictly weight-dependent. Weighing your cat daily ensures precise therapeutic doses.

View on Amazon →

Tomlyn High-Calorie Nutritional Gel

FIP cats experience rapid muscle wasting. High-calorie gels supply essential vitamins and energy to combat wasting.

View on Chewy →

We earn a commission if you make a purchase, at no additional cost to you. Always consult your vet.

Safe to Monitor at Home

  • Isolated mild lethargy without fever
  • Eating normally despite slight weight loss

In our experience

In our experience, a cat that won't lift its head for its favorite treat is a cat that needs a vet immediately. Never ignore profound lethargy.

Related Emergency Resources

Written by: Dr. E. R. Sinclair (DVM Consult) & Editorial Team

Our emergency triage guides are developed by experienced veterinary professionals and reviewed by consulting DVMs to ensure you receive accurate, immediately actionable protocols before reaching the clinic.

Planning Ahead: Pet Insurance for Your Cat

A single condition like this can run $1,500–$5,000 without insurance. If your cat is currently healthy or has a manageable condition, enrolling a policy now locks in coverage for future conditions. Compare the 6 leading cat insurance carriers for 2026 →