FIP Cure for Cats: What UK Owners Should Really Know

Key takeaway: There is a real, evidence-based treatment for Feline Infectious Peritonitis (FIP), and its foundation is the antiviral GS-441524. A standard course runs 84 days under veterinary supervision, and GS-441524 monotherapy has a 92% success rate reported by UC Davis (Pedersen, 2019). We do not use the word cure as an efficacy claim, because the accurate clinical goal is lasting remission, and we are clear about what the data shows and what it does not.

If you are in the UK and typing "FIP cure for cats" into a search box, you are almost certainly frightened and looking for something solid. This article is written to give you that: specific numbers, specific protocols, and specific products, with every claim matched to its source.

A cat resting comfortably at home.

Is There a Real Treatment for Feline Infectious Peritonitis (FIP) in Cats?

Yes. Feline Infectious Peritonitis (FIP) went from almost always fatal to highly treatable because of the antiviral GS-441524, the ingredient at the core of modern FIP treatment. The pivotal field study from UC Davis (Pedersen, 2019) reported a 92% success rate with GS-441524, and since 2019 the wider treatment network has supported 100,000+ cats treated.

That is a genuine shift. A decade ago, an FIP diagnosis was widely treated as a death sentence. Today, with prompt diagnosis and a full course of antiviral therapy, most cats have a real path to remission.

What matters now is starting quickly and completing the protocol. If you are still confirming a diagnosis, our guide to the 12 early warning symptoms of FIP can help you and your vet act sooner.

Why Do We Say Remission Instead of Cure for Feline Infectious Peritonitis (FIP)?

We say remission because it is the honest clinical term for what GS-441524 achieves in Feline Infectious Peritonitis (FIP). Remission means the virus is suppressed, symptoms resolve, and the cat returns to normal life, with an observation period after treatment to confirm the result holds.

The word cure implies a permanent, guaranteed outcome that no responsible provider can promise for any cat. CureFIP is our brand name, but we do not use "cure" as an efficacy claim, because the evidence supports strong remission rates, not certainty for every individual.

This is why success rates are reported as percentages. A 92% success rate is excellent, and it also tells you plainly that outcomes depend on the cat, the form of disease, timing, and completing the full 84-day course.

What Is GS-441524 and How Does It Treat Feline Infectious Peritonitis (FIP)?

GS-441524 is a nucleoside analogue antiviral that blocks the feline coronavirus responsible for Feline Infectious Peritonitis (FIP) from replicating. By stopping viral replication, it gives the cat's body the chance to recover as inflammation subsides over the treatment course.

GS-441524 is the proven hero of FIP treatment and the active ingredient across the CureFIP injectable range. It is delivered as a daily subcutaneous injection for the full protocol, and evidence shows a 92% success rate with GS-441524 monotherapy (UC Davis, Pedersen, 2019).

More recently, combining GS-441524 with a second antiviral, EIDD-1931, has been studied for harder cases. In a dual antiviral study, Li and Cheah (2025) reported 78.3% remission in cats that had already relapsed, and you can read the detail in our summary of how dual antiviral therapy is changing FIP treatment.

What Are the Four Forms of Feline Infectious Peritonitis (FIP)?

Feline Infectious Peritonitis (FIP) takes four forms: wet, dry, ocular, and neurological. Each form shapes the dose and the treatment plan, which is why matching the presentation to the protocol matters so much.

The dosing figures below are for the CureFIP GS-441524 injectable range, given as one subcutaneous injection per day, 7 days a week, for 12 weeks (84 days), referencing Pedersen et al., UC Davis (PMC6435921).

Wet (Effusive) Feline Infectious Peritonitis (FIP)

Wet Feline Infectious Peritonitis (FIP) is the effusive form, where fluid builds up in the abdomen or chest, causing a swollen belly or laboured breathing. It is often the fastest-moving form, so early treatment is important.

For wet FIP, the CureFIP injectable dose is 6 mg/kg once daily by subcutaneous injection for 84 days. Your veterinarian will confirm the exact dose for your cat's weight.

Dry (Non-effusive) Feline Infectious Peritonitis (FIP)

Dry Feline Infectious Peritonitis (FIP) is the non-effusive form, with little or no fluid. Signs can be subtler and include weight loss, persistent fever, and inflammatory masses in the organs.

For dry FIP, the CureFIP injectable dose is 8 mg/kg once daily by subcutaneous injection for 84 days. Because dry FIP can be harder to spot, tracking bloodwork over time helps confirm progress, and our guide to cat bloodwork during FIP treatment explains what each result means.

Ocular Feline Infectious Peritonitis (FIP)

Ocular Feline Infectious Peritonitis (FIP) affects the eyes, producing colour changes, cloudiness, or inflammation that a vet can identify on examination. Because the eye is served by tissues the virus can hide behind, this form needs a higher dose.

For ocular FIP, the CureFIP injectable dose is 10 mg/kg once daily by subcutaneous injection for 84 days.

Neurological Feline Infectious Peritonitis (FIP)

Neurological Feline Infectious Peritonitis (FIP) affects the brain and spinal cord, and signs can include wobbliness, seizures, or behaviour changes. Reaching the central nervous system requires the highest dose of the four forms.

For neurological FIP, the CureFIP injectable dose is 10 mg/kg once daily by subcutaneous injection for 84 days.

The Four Forms and Their Injectable Doses

FIP form	CureFIP injectable dose	Schedule	Duration
Wet (effusive)	6 mg/kg	1 subcutaneous injection/day	84 days
Dry (non-effusive)	8 mg/kg	1 subcutaneous injection/day	84 days
Ocular	10 mg/kg	1 subcutaneous injection/day	84 days
Neurological	10 mg/kg	1 subcutaneous injection/day	84 days

Doses reference Pedersen et al., UC Davis (PMC6435921). Your veterinarian sets the final dose based on your cat's weight and form of FIP.

Which Feline Infectious Peritonitis (FIP) Treatment Options Are Available?

The main options for Feline Infectious Peritonitis (FIP) are GS-441524 injectables and a GS-441524 based oral capsule route, and the right choice depends on the form of FIP and your cat. Injectables are the most studied route and carry the 92% success rate reported by UC Davis (Pedersen, 2019).

The table below shows the CureFIP FIP products, using prices and figures exactly as listed. Prices are in EUR and are not converted.

Product	Price	Strength	Route
CureFIP™ GS-441524 Injectable 20mg/ml	€79.00	20 mg/ml	Subcutaneous injection
CureFIP™ GS-441524 Injectable 30mg/ml	€89.00	30 mg/ml	Subcutaneous injection
Cure FIP Antiviral 40mg/ml	€119.00	40 mg/ml	Subcutaneous injection
CURE FIP™ Dual Antiviral Oral Capsules	€179.00	GS-441524 + EIDD-1931	Oral capsule
EIDD-1931 Oral Capsules	€69.00	15 mg per capsule	Oral capsule

The CURE FIP™ Dual Antiviral Oral Capsules combine GS-441524 with EIDD-1931 and are dosed by weight: under 2.5 kg is GS-441524 25 mg + EIDD-1931 5 mg; 2.5 to 5 kg is GS-441524 35 mg + EIDD-1931 8 mg; over 5 kg is GS-441524 50 mg + EIDD-1931 12 mg, given as one capsule per day for a recommended 12 weeks.

The oral dual route is positioned for wet and dry FIP. In some regions it is noted as not recommended once ocular or neurological signs are present, or if the cat cannot eat or defecate, so this is a decision to make with your vet. To understand the science behind combining two antivirals, see our overview of dual nucleoside analogue therapy for FIP.

What Does Feline Infectious Peritonitis (FIP) Treatment Cost for UK Owners?

The total cost of Feline Infectious Peritonitis (FIP) treatment depends on your cat's weight, the form of FIP, and how many vials or bottles the 84-day course requires. Larger cats and the higher-dose forms, such as ocular and neurological FIP, use more medication over the course.

CureFIP prices are listed in EUR and shown exactly as on the store, for example the CureFIP™ GS-441524 Injectable 20mg/ml at €79.00 and the Cure FIP Antiviral 40mg/ml at €119.00. Because your cat's weight changes over 12 weeks, your veterinarian and our team can help you estimate the full quantity you will need before you begin.

We are upfront about protocol length and cost so there are no surprises. A complete, uninterrupted 84-day course gives your cat the best chance at durable remission, and stopping early is one of the most common reasons treatment fails.

How Soon Should Feline Infectious Peritonitis (FIP) Treatment Start?

Feline Infectious Peritonitis (FIP) treatment should start as soon as a diagnosis is reached with your veterinarian, because earlier antiviral treatment generally gives a better outcome. FIP can progress quickly, especially the wet and neurological forms, so speed matters.

Here is a simple sequence to move from worry to action:

1. Book a veterinary appointment and share the specific signs you have noticed.

2. Work with your vet to confirm the form of FIP: wet, dry, ocular, or neurological.

3. Agree the correct GS-441524 dose and route for your cat's weight and form.

4. Begin the 84-day protocol and keep every daily dose consistent.

5. Review bloodwork and progress with your vet at regular checkpoints.

Knowing what each stage looks like reduces anxiety, and our GS-441524 treatment timeline guide walks you through what to expect week by week. For practical day-to-day support, our FIP survival tips for cats covers nutrition, hydration, and monitoring at home.

FAQ: Feline Infectious Peritonitis (FIP) Treatment for UK Owners

Is there a cure for FIP in cats?

There is a highly effective, evidence-based treatment for Feline Infectious Peritonitis (FIP) built on the antiviral GS-441524, which has a 92% success rate reported by UC Davis (Pedersen, 2019). The accurate clinical goal is lasting remission confirmed after treatment, so we describe outcomes as remission rather than as a guaranteed cure.

How long does FIP treatment take?

A standard course of GS-441524 for Feline Infectious Peritonitis (FIP) runs 84 days, which is 12 weeks of daily treatment under veterinary supervision. Completing the full protocol without gaps is one of the most important factors in reaching durable remission.

What is the GS-441524 success rate?

GS-441524 monotherapy for Feline Infectious Peritonitis (FIP) has a 92% success rate reported by UC Davis (Pedersen, 2019). For cats that had already relapsed, a dual antiviral approach combining GS-441524 with EIDD-1931 reported 78.3% remission (Li and Cheah, 2025), and you can read the full dual antiviral study results here.

Does the FIP dose change depending on the form?

Yes. For the CureFIP injectables, the daily subcutaneous dose is 6 mg/kg for wet FIP, 8 mg/kg for dry FIP, and 10 mg/kg for both ocular and neurological FIP, each for 84 days. Your veterinarian confirms the exact dose based on your cat's current weight.

Can FIP come back after treatment?

Relapse is possible, which is why cats are monitored during an observation period after the 84-day course of Feline Infectious Peritonitis (FIP) treatment. When it occurs, dual antiviral therapy has shown 78.3% remission in cats that had already relapsed (Li and Cheah, 2025), and your veterinarian can guide the next steps.

If your cat has just been diagnosed, you do not have to work through this alone. Learn more about the available GS-441524 treatment options and talk with our team or your own veterinarian by visiting the CureFIP team in the UK, so you can choose the plan that fits your cat with confidence.