Not Sure if it's FIP?
Don't Panic.

Feline Infectious Peritonitis (FIP) symptoms can be subtle and progress rapidly. Common early warning signs include lethargy, loss of appetite, and persistent fever. Since FIP acts fast, early detection and immediate action are the most critical factors for your cat's recovery.

FIP Survival Guide: Identify, Confirm, Act Fast
Diagnostic Center

FIP Symptom & Lab Tracker

A clinical framework to analyze early warning signs and blood biomarkers.

1. Observation
Wet FIP
Dry FIP
Neuro & Ocular
Visible Swollen Belly
Difficulty Breathing
Lethargy & Fatigue
Loss of Appetite
Persistent Fever
Unexplained Weight Loss
Jaundice (Yellow Skin/Eyes)
Poor Coat Quality / Stunted Growth
Iris Color Changes
Loss of Balance (Ataxia)
Seizures / Head Tilt
Eye Cloudiness (Uveitis)
2. Lab Indicators
< 0.7 A:G Ratio

The Gold Standard Marker

The white-to-blue protein ratio is the #1 red flag. Values under 0.6 are high-risk indicators, reflecting the classic FIP combination of low Albumin and elevated Globulin.

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FIRE ALARM

SAA

A high-sensitivity marker that spikes hundreds of times above normal when intense inflammation is present.

ANEMIA CHECK

HCT / PCV

Shows if the virus is impacting blood cell production, leading to chronic fatigue and non-regenerative anemia.

IMMUNE OVERDRIVE

Globulin

High levels signal an overactive immune system producing massive antibodies to combat the virus.

PROTEIN LOSS

Albumin

Levels decrease due to organ stress or protein-rich fluid leaking into the chest/abdomen.

LIVER STRESS

Bilirubin

Elevated levels often indicate liver involvement or secondary damage, frequently seen in advanced cases.

How to Treat FIP

Select the appropriate GS-441524 treatment protocol. From emergency pickup to daily oral tablets, we support every step of your cat's recovery.

Injection

FIP Treatment Injection (GS-441524)
$50.00
Pickup

Emergency Rescue Kit (Local Pickup)
$80.00
50mg

50mg Oral Tablets (GS-441524)
$120.00
15mg

15mg Mini-Tablet (Kitten-Friendly)
$150.00

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    FAQ

    About FIP

    What is FIP?
    Feline Infectious Peritonitis (FIP) is a serious viral disease caused by a mutation of feline coronavirus (FCoV).
    How long does FIP treatment take?
    Standard treatment lasts 84 days (12 weeks).
    Is FIP contagious to other cats?
    No. FIP itself is not contagious. mutated virus that causes FIP does not spread.
    Injection or oral GS-441524 — which is better?
    Both are effective. Injections for severe/early stages, tablets for stable cats.
    Is my cat at risk of developing FIP?
    Young cats, multi-cat environments, and high-stress situations are higher risk factors.
    What is the success rate of FIP treatment?
    Success rates reach 95–98% with proper Maxpaw treatment.
    What are the common symptoms of FIP?
    Common signs include persistent fever, weight loss, lethargy, and fluid accumulation.
    Can my cat relapse after treatment?
    Relapse rates are below 5% and can usually be treated with a second course.
    How is FIP diagnosed?
    Diagnosis involves clinical signs, blood work (A:G ratio, Globulin, SAA), and sometimes imaging.
    About Maxpaw
    Learn more about our FIP care approach and dedicated support on our mission page.

    Others

    How much medication should my cat take?
    Dosage is based on your cat's current body weight and FIP type. To make things easier, we provide a dosage calculator to help you determine the correct daily dose.
    👉 Use our dosage calculator here
    Shipping & Delivery
    We offer overnight shipping within the United States to ensure timely delivery during urgent treatment periods. We also offer local pickup service. If you need local pickup, please contact our support team for an arrangement.
    How do I give injections?
    We provide a step-by-step injection guide, including preparation, injection technique, and aftercare tips to help reduce stress for both you and your cat.
    👉 View Injection Guide
    How can I make a payment?
    Making a payment with Maxpaw is easy and secure. Here is our payment information:
    1. Venmo transfer: Search 【@MaxPaw】 from the Venmo app
    2. Zelle transfer: olivia@maxpawhealth.com
    3. Credit/Debit card: A payment link will be emailed to you within 5 min after placing an order.