Feline Infectious Peritonitis (FIP) is a serious viral disease caused by a mutation of feline coronavirus (FCoV).With modern antiviral treatment, FIP is no longer considered a fatal disease.

No. FIP itself is not contagious.While feline coronavirus can spread between cats, the mutated virus that causes FIP does not.

FIP is more commonly seen in:
- Kittens and young cats
- Cats in shelters or multi-cat households
- Cats under stress or with weakened immunity
Most cats exposed to coronavirus never develop FIP.

Common signs include:
- Persistent fever
- Loss of appetite and weight loss
- Lethargy
- Abdominal or chest fluid (wet FIP)
- Neurological or eye symptoms (dry FIP)
Symptoms vary by cat and disease type.

There is no single definitive test for FIP.
Diagnosis is based on:
- Clinical signs
- Bloodwork (such as A/G ratio)
- Imaging or fluid analysis

Standard treatment lasts 84 days (12 weeks).
Cats that complete the full course and remain stable afterward are considered cured.

Both forms are effective when correctly dosed.
- Maxpaw injectable GS-441524 typically shows improvement within 1–3 days and is recommended for early-stage or severe cases.
- Maxpaw oral tablets usually show improvement within about 7 days, and are suitable once the cat is stable and eating well.

When properly dosed and completed, success rates can reach 95–98%.When properly dosed and completed, Maxpaw treatment achieves up to 98% success.

Relapse rates are low (below 5%). Most relapses can be successfully treated with a second course.

Learn more about Maxpaw and our FIP care approach: Watch on YouTube.

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

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

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.

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