Feline Infectious Peritonitis (FIP)
A fever that won't come down, a swollen belly or weight loss. FIP can now be treated at home.
Antiviral care for cats with FIP, FCV and FHV-1
GS-441524 antiviral treatment for Feline Infectious Peritonitis (FIP) in cats. Trusted by 140,000+ cat owners globally since 2019. Veterinarian approved. Fast shipping across the USA. Start treatment today.
Shop treatmentsWhich one does my cat have?
Three infections, three treatments. Start with the signs you see.
Feline Calicivirus (FCV)
Mouth pain that keeps coming back. Ulcers, drooling, bad breath, and a cat that goes to its food then walks away.
Feline Herpesvirus (FHV-1)
Eyes and nose. Squinting, weeping or redness, and sneezing that clears up and then comes back.
Four steps to treat your cat at home.
- 1
Tell us what's happening
Share the diagnosis or the symptoms. We match the treatment to it.
- 2
Get the right protocol
A treatment matched to your cat's infection and weight.
- 3
Treat at home
Injectable or oral, on a simple daily schedule.
- 4
Track and adjust
You send updates. We help you read progress.
Real stories from three very different infections.
“After 3 days he normalised, and fully recovered in 3 weeks. Back to his own healthy now!”
“Within a week, his bloated stomach had disappeared, and after 10 days his energy had increased to the extent that he was climbing trees again.”
“Improvement began by 48 hours and after 5 days he is back to his normal lively self.”
Common questions
What is Feline Infectious Peritonitis (FIP)?
A serious, progressive disease from a mutation of the feline coronavirus. It used to be fatal; today it can be treated with GS-441524.
What is the success rate?
Across studies of over 650 cats, the combined GS-441524 success rate is approximately 92%.
How long is treatment?
An 84-day protocol, then a monitoring period to confirm remission.
What is Feline Calicivirus (FCV)?
A common feline virus that inflames the mouth and gums, causing ulcers, drooling, and bad breath, often for months or years.
What is Feline Herpesvirus (FHV-1)?
A common virus behind recurring eye and respiratory signs: squinting, weepy or red eyes, conjunctivitis, sneezing.
Not sure which one?
Tell us the symptoms and we will point you to the right treatment.
Talk to a treatment expert