Feline Infectious Peritonitis (FIP) is a serious and sometimes fatal disease affecting cats. Upon diagnosis, many pet parents are understandably concerned about the FIP prognosis. Historically, FIP was 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.
Before 2017, there was no known cure for FIP. Treatments primarily focused on managing symptoms rather than addressing the underlying disease. Veterinarians often prescribed interferons and TNF-alpha inhibitors to help regulate a cat's immune response. Supportive care—including dietary supplements—aimed to prolong survival, especially in cases of dry FIP. Despite these efforts, most cats diagnosed with FIP faced euthanasia within days or weeks. Fortunately, this is no longer the case as more effective treatments have emerged in recent years.
The FIP prognosis for affected cats is now better than ever before. Recent breakthroughs in antiviral medications give veterinarians and pet parents new tools to fight FIP, with many cats achieving full remission. Ongoing research and advancements in veterinary medicine may continue to improve survival rates.
The FIP prognosis for affected cats is now better than ever before. Recent breakthroughs in antiviral medications give veterinarians and pet parents new tools to fight FIP, with many cats achieving full remission. Ongoing research and advancements in veterinary medicine may continue to improve survival rates.
GS-441524 is a groundbreaking antiviral drug revolutionizing FIP treatment. The medication first became available in 2018 and was recently approved for legal use in the U.S. in 2024. Clinical trials in the U.K. and Australia demonstrated its remarkable success in treating FIP. As a nucleoside analog, GS-441524 works by inserting itself into the viral RNA, preventing the virus from replicating.
GS-441524 is available in two forms from Mixlab:
Lifesaving treatment should be accessible to all cats. At Mixlab, we provide GS-441524 at an affordable cost to both pet parents and veterinary offices - with tablets starting at $8.99 per tab. This means, a full course of treatment for the recommended 84 days costs less than $800 through Mixlab—priced lower than the industry average.
Our treatment not only makes FIP care significantly more affordable—helping more cats get the care they need—but it also ships with fast and free next-day delivery. Specific costs may vary based on the quantity and form of medication needed.
*This calculation is based on the average weight of cats on GS-441524 from Mixlab, which is 7 lbs, with the standard dosing of 15mg/kg administered once every 24 hours
While no FIP medication—including GS-441524—is officially FDA-approved, it is legal for U.S. compounding pharmacies to prepare GS-441524 for patient-specific use when prescribed by a veterinarian. Additionally, GS-441524 has been nominated for inclusion on the FDA’s GFI #256 list of approved bulk drug substances for office-use compounding. At the time this article is published, this nomination is currently under review.
As a trusted compounding pharmacy, Mixlab adheres to USP guidelines and PCAB® standards, sourcing ingredients exclusively from FDA-approved wholesalers based in the U.S. Pet owners and veterinarians can be confident in the quality and safety of GS-441524 from Mixlab. Hear from one of the pet parents who recently trusted us for their cat’s FIP medication:
Prior to the development of GS-441524, veterinarians attempted to manage FIP with medications such as prednisolone, interferon and polyprenyl immunostimulant. Unfortunately, these treatments were largely ineffective, and many cats still faced euthanasia. The advent of GS-441524 marked a significant turning point in FIP treatment, offering hope where there was previously little.
With the introduction of GS-441524, the cure rate for FIP has risen to over 80%. However, factors such as misdiagnosis, improper dosage, additional health conditions and potential drug resistance can influence a cat's survival outcome. Collaborating closely with a veterinarian ensures the best possible treatment plan tailored to your cat's specific needs.
Watching your cat go through FIP can be overwhelming, but you can make a real difference in their recovery. Your presence, care, and love are powerful tools that can help them feel safe and supported during their treatment. Here’s how you can take an active role in the healing journey:
Facing an FIP diagnosis is incredibly tough for most pet parents, both emotionally and mentally. With knowledge and coping strategies, you can navigate this challenging journey with both resilience and compassion—ensuring that both you and your cat are well cared for. Here are some ways to cope:
If your cat has been diagnosed with FIP, timely treatment is crucial. Mixlab offers GS-441524 in both oral suspension and tablet forms, ensuring that you can easily and successfully administer treatment to your cat. Given the importance of early intervention, we provide fast and free next-day delivery for your cat's medication. Simply submit your prescription online or reach out to our team with any questions. We're here to support you and your cat every step of the way.