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A second chance for cats with FIP

Feline Infectious Peritonitis (FIP)

Feline infectious peritonitis (FIP) is a serious and sometimes fatal disease affecting cats. It was once considered incurable, with no viable treatment options, however, recent research and advancements in veterinary medicine have significantly improved survival rates for cats diagnosed with FIP.

View Treatment Options

GS-441524 for FIP is available through Mixlab

For Prescibers

Mixlab offers compounded GS-441524 to treat feline infectious peritonitis (FIP). Log in to your eMix account to prescribe for a patient in need or contact our pharmacy team for support.

Prescribe with Mixlab

For Pet Parents

If your cat has been diagnosed with FIP, ask your veterinarian about prescribing GS-441524 through Mixlab. You can also request a prescription below and we'll reach out to your veterinarian for you!

Submit Prescription Request
What is FIP?

What is FIP?

Feline Infectious Peritonitis (FIP) is a devastating disease caused by a mutation of feline coronavirus (FCoV). While FCoV is highly prevalent and contagious among cats, FIP itself is not contagious.

Only about 5-10% of cats exposed to feline coronavirus develop FIP. The disease can appear weeks, months or even years after initial exposure. While the exact causes of why some cats develop FIP while others don’t are still not fully understood, it appears most commonly in:

Kittens & young cats under 2 years old
Pedigree cats (due to genetic predisposition)
Cats in multi-cat households, catteries, or shelters

Signs of FIP:
What to Look For

Early FIP Symptoms

FIP can show up in different ways, but common early symptoms include:

Lethargy & fever that won’t go away

Loss of appetite & weight loss

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Two Main Forms of FIP

Once the virus mutates, it triggers an abnormal immune response, leading to widespread inflammation and damage to organs. FIP can appear in two main forms:

Wet (Effusive) FIP
Causes fluid buildup in the abdomen or chest and sometimes around the heart. This can result in a swollen belly or difficulty breathing.
Dry (Non-Effusive) FIP

Involves inflammation in various organs like the brain, eyes, liver, intestines or others, often leading to neurological symptoms, vision changes, or organ failure.

  • A cat’s eyes may appear cloudy, bloody, or have uneven pupil sizes, and the cat may show signs of pain, like squinting or keeping their eyes closed. This is commonly referred to as ocular FIP.
  • If the brain or spinal cord is affected (neurological FIP), cats may show signs such as seizures, a wobbly gait, behavioral changes, or trembling.

Some cats can have a combination of both “wet” and “dry” forms of FIP, and may have pale or yellow-tinged gums.

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Treatment for FIP

For a while, there was no effective legal treatment for FIP. However, recent advancements in veterinary medicine have brought hope to pet owners and their cats.

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GS-441524 for Treating FIP

GS-441524 is an antiviral medication that has proven to be a breakthrough treatment for FIP, with an 85%+ success rate in helping cats recover.

GS-441524 works by inhibiting the replication of the FIP virus, allowing the cat’s immune system to fight off the disease. It has shown effectiveness in both the "wet" (effusive) and "dry" (non-effusive) forms of FIP, including ocular and neurological cases.

Based on current recommendations, cats are typically treated for 12 weeks on GS-441524. FIP symptoms should start to improve within 48-72 hours after starting treatment.

It’s important to note that while no FIP medications are FDA-approved, veterinarians can legally prescribe it through compounding pharmacies like Mixlab.

Other FIP Treatment Options

While GS-441524 remains the gold standard for FIP treatment, supportive care such as fluids and pain management may also be recommended, especially in the early stages of the disease. In some cases, additional medications may be used to manage symptoms like fever or inflammation.

Curious how GS-441524 compares to other FIP medications like Remdesivir, Molnupiravir or EIDD-1931?

Download Our Info Sheet

Treatment for FIP is Available Through Mixlab

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50mg QUADmix tablets

  • 10mm in size
  • Designed to maximize palatability and increase compliance
  • Scored twice (easily split into quarters) for customizable dosing

Request Medication

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50mg/mL oral suspension

  • Great for cats who resist pills
  • Easy-to-use syringe allows for more precise dosing
  • Available in over 30 delicious pet-friendly flavors

Request Medication

Why Mixlab?

Free next-day delivery nationwide (same-day available in select markets)
Time is of the essence, especially for critical conditions like FIP. With Mixlab, you don’t have to wait weeks for medication to arrive. Our industry leading turn around times coupled with our free next-day delivery on new orders means you can start treatment right away.
Exceptional 5-star customer service
You and your pet matter to us. That’s why we’re committed to delivering outstanding service with fast, reliable turnaround times. We understand that the journey can be challenging, so we go the extra mile. Each medication is shipped in a personalized care package, complete with everything needed to administer the treatment, along with a species-specific toy to bring a little joy during a tough time.
Formulated with strict quality standards to ensure optimal efficacy and safety
Mixlab is proud to be a PCAB-accredited pharmacy. Our ingredients are sourced from industry leading suppliers and FDA-registered facilities and go through a rigorous quality assurance process to ensure that only the best is used for our treatments. We compound using USP-grade chemicals and exceed USP <795> standards.
Easy to administer oral medication
Cats can be difficult to medicate but we’re here to help. Our compounded GS-441524 is available in convenient oral forms to help ensure your cat gets the treatment they need, stress-free. Our 50mg QUADmix tablets are scored twice (can be split into quarters), allowing for precise, customizable dosing to fit your cat’s unique needs. Our oral suspension is a great option for cats who resist pills, and comes with an easy-to-use syringe for accurate dosing.
Affordable FIP treatment
We believe that every cat deserves a fighting chance. That’s why we’re proud to offer affordable, high-quality GS-441524 to help more cats get the care they need. A full course of treatment through Mixlab is less than the industry standard.
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Additional FIP Resources

Learn more about GS-441524 and how it compares to other FIP medication on the market by downloading our info sheet.

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