Feline Infectious Peritonitis Cost: A UK Guide
The cost of Feline Infectious Peritonitis ("FIP") treatment in the UK depends on three things: your cat's weight, which of the four forms of FIP your cat has, and how long the course runs. At CureFIP, the core treatment is GS-441524, the antiviral at the heart of modern FIP care, with catalog prices from €79.00 for the GS-441524 Injectable 20mg/ml. The standard protocol runs 12 weeks (84 days) under your veterinarian's supervision, and your total spend scales mainly with your cat's weight and the daily dose for the form of FIP.
Below we break the price down honestly: what you pay for, why heavier cats and more advanced forms cost more, and where oral capsules fit in. Every figure here comes straight from our catalog or from a named study, and where we have no number, we say so and send you to your veterinarian.
A cat resting comfortably at home.
How much does Feline Infectious Peritonitis (FIP) treatment cost in the UK?
Feline Infectious Peritonitis (FIP) treatment cost is driven by the GS-441524 product you use, your cat's weight, and the 12-week (84-day) protocol length. Our catalog lists the GS-441524 Injectable 20mg/ml at €79.00, the GS-441524 Injectable 30mg/ml at €89.00, and the Cure FIP Antiviral 40mg/ml at €119.00, while the CURE FIP™ Dual Antiviral Oral Capsules are listed at €179.00.
We list prices in EUR exactly as they appear in the store, and we never convert currency for you. The amount you actually need across a full course depends on how many vials or capsules your cat's weight and daily dose require, which is a conversation to have with your veterinarian.
One reassurance on commitment: the only guarantee we offer is a practical one. You can cancel any time before your order ships for a full refund. We do not promise a cure, because there are no guarantees in medicine, only statistical success rates that we quote with their source.
What drives the cost of Feline Infectious Peritonitis (FIP) treatment?
The cost of Feline Infectious Peritonitis (FIP) treatment is shaped mostly by body weight and the daily dose, because GS-441524 injectables are dosed per kilogram. A heavier cat needs more milligrams each day, so it gets through product faster than a small kitten on the same schedule.
The main cost drivers are:
Your cat's weight. Injectable dosing is per kg, so larger cats use more product over the 12-week course.
The form of FIP. Wet FIP is dosed at 6 mg/kg, dry at 8 mg/kg, and ocular and neurological at 10 mg/kg, so more advanced forms use more per day.
Protocol length. The standard injectable course is 12 weeks (84 days), one injection per day, 7 days a week.
Product strength. A higher concentration delivers the same milligram dose in a smaller volume, which changes how many vials you work through.
You can learn more about recognising the disease early in our UK owner's visual guide to FIP symptoms, because catching it sooner can mean a more straightforward treatment plan.
How much do GS-441524 injectables for Feline Infectious Peritonitis (FIP) cost?
GS-441524 injectables for Feline Infectious Peritonitis (FIP) are listed in three strengths, priced from €79.00 to €119.00 per vial, each available in 8ml and 10ml sizes. GS-441524 is the proven hero of FIP treatment, and the injectable is the route most courses begin with.
Product | Strength | Sizes | Price |
CureFIP™ GS-441524 Injectable 20mg/ml | 20 mg/ml | 8ml, 10ml | €79.00 |
CureFIP™ GS-441524 Injectable 30mg/ml | 30 mg/ml | 8ml, 10ml | €89.00 |
Cure FIP Antiviral 40mg/ml | 40 mg/ml | 8ml, 10ml | €119.00 |
The schedule is one subcutaneous injection per day, 7 days a week, for 12 weeks (84 days). Which strength suits your cat depends on the daily dose and how much volume you want to inject, so confirm the choice with your veterinarian.
A higher concentration such as the 40mg/ml means the same milligram dose fits into less liquid, which many caregivers find gentler for daily injections. The per-vial price is higher, but you may need fewer vials for a heavier cat.
What are the four forms of Feline Infectious Peritonitis (FIP) and how do they affect dosing and cost?
Feline Infectious Peritonitis (FIP) takes four distinct forms, wet (effusive), dry (non-effusive), ocular, and neurological, and each one sets its own daily GS-441524 dose. Because dose rises with severity, the form your cat has directly affects how much product a full course uses.
FIP is caused by a mutated form of the common feline coronavirus (FCoV). The dosing table below mirrors the four forms, so the signs you see line up with the daily dose your veterinarian will plan.
FIP form | Daily GS-441524 dose | Schedule | Course |
Wet (effusive) | 6 mg/kg | 1 injection/day, 7 days/week | 12 weeks (84 days) |
Dry (non-effusive) | 8 mg/kg | 1 injection/day, 7 days/week | 12 weeks (84 days) |
Ocular | 10 mg/kg | 1 injection/day, 7 days/week | 12 weeks (84 days) |
Neurological | 10 mg/kg | 1 injection/day, 7 days/week | 12 weeks (84 days) |
These 6/8/10 mg/kg doses sit within the 5 to 10 mg/kg range associated with the best outcomes in the systematic review by Gokalsing et al. 2025, and are consistent with current clinical practice in Ansari Mood et al. 2025.
Wet (effusive) Feline Infectious Peritonitis (FIP)
Wet Feline Infectious Peritonitis (FIP) causes fluid to build up in the abdomen or chest, which can lead to a swollen belly or laboured breathing. It is dosed at 6 mg/kg once daily, the lowest of the four forms, so for a given weight it tends to use the least product per day.
Dry (non-effusive) Feline Infectious Peritonitis (FIP)
Dry Feline Infectious Peritonitis (FIP) produces no obvious fluid, so signs can be subtler: weight loss, persistent fever, lethargy, and poor appetite. It is dosed at 8 mg/kg once daily.
Ocular Feline Infectious Peritonitis (FIP)
Ocular Feline Infectious Peritonitis (FIP) affects the eyes, with signs such as a change in iris colour, cloudiness, inflammation inside the eye (uveitis), and vision loss from ocular lesions. It is dosed at 10 mg/kg once daily, so it uses more product per day than wet or dry FIP.
Neurological Feline Infectious Peritonitis (FIP)
Neurological Feline Infectious Peritonitis (FIP) affects the nervous system, with signs such as seizures, head tilt, loss of balance, paralysis, and disorientation. It is also dosed at 10 mg/kg once daily, the highest tier alongside ocular FIP.
Can oral capsules lower the cost of Feline Infectious Peritonitis (FIP) treatment?
Oral capsules can simplify, and sometimes streamline, Feline Infectious Peritonitis (FIP) treatment once your cat is stable, and they are commonly introduced after 2 to 4 weeks of GS-441524 injections, including in ocular and neurological cases. The CURE FIP™ Dual Antiviral Oral Capsules are listed at €179.00.
The key advantage of the dual capsule is simple dosing: one capsule a day for your cat's weight class, with no mg calculation and no counting capsules. One pill covers one weight class.
Weight class | Dual capsule dose |
0 to 2.5 kg (0 to 5.5 lb) | 1 capsule per day |
2.5 to 5 kg (5.5 to 11 lb) | 1 capsule per day |
over 5 kg (over 11 lb) | 1 capsule per day |
The dual capsule contains GS-441524 + EIDD-1931, and the recommended course is 12 weeks. It is not for cats with vomiting or diarrhoea, cats under 1 year old with wet (effusive) FIP, cats that cannot eat or defecate normally, or pregnant, nursing or breeding cats, because it contains EIDD-1931.
There is also an EIDD-1931 Oral Capsules option at €69.00, with 15 mg per capsule and 60 capsules per bottle. Its dosing is 1 capsule (15 mg) per 2.5 kg (5.5 lb) of body weight every 12 hours (under 2.5 kg / under 5.5 lb = 1; 2.5 to 5 kg / 5.5 to 11 lb = 2; over 5 kg / over 11 lb = 3), with a standard FIP course of 60 days that may run to 90 days or longer in chronic or severe cases. It is not a starting or sole treatment for ocular or neurological FIP without the injection phase. Your veterinarian will decide when and whether to move to oral.
Does Feline Infectious Peritonitis (FIP) treatment work, and is it worth the cost?
Feline Infectious Peritonitis (FIP) treatment with GS-441524 has strong published support, which is what makes the investment meaningful rather than hopeful. More than 100,000 cats have been treated across the network since 2019, including cats treated with GS-441524.
The evidence we rely on, each with its source, includes:
In Pedersen et al. 2019 (J Feline Med Surg), 24 of the 26 cats that completed injectable GS-441524 treatment stayed healthy, a 92% success rate (more than 9 out of 10 cats that completed injectable GS-441524 treatment stayed healthy).
In the 629-cat cohort of Ansari Mood et al. 2025, GS-441524 (subcutaneous and/or oral, at least 12 weeks) reached 94.12% survival (more than 9 out of 10 cats survived).
Across 11 studies and 650 cats, overall success was 84.6% in the systematic review by Gokalsing et al. 2025 (more than 8 out of 10 cats were treated successfully).
For the dual antiviral GS-441524 + EIDD-1931, our own data from 46 treated cats showed 78.3% remission (about 8 out of 10 cats on the dual antiviral reached remission).
These are statistics, not promises, and every cat is different. For a fuller picture of what recovery looks like, our guide on what UK owners should really know about an FIP cure walks through the journey in plain language.
How do I budget for a full course of Feline Infectious Peritonitis (FIP) treatment?
Budgeting for a full Feline Infectious Peritonitis (FIP) course means working out your cat's daily dose, then estimating how much product the 12-week (84-day) protocol needs. Here is a simple way to approach it with your veterinarian:
Confirm the form of FIP, which sets the daily dose (wet 6 mg/kg, dry 8 mg/kg, ocular and neurological 10 mg/kg).
Weigh your cat accurately, since dosing is per kg and weight can change during treatment.
Choose the GS-441524 strength (20mg/ml at €79.00, 30mg/ml at €89.00, or 40mg/ml at €119.00) and vial size (8ml or 10ml) with your veterinarian.
Plan for the full 12 weeks (84 days) of one daily injection, and re-check weight so the dose stays correct as your cat grows or regains condition.
Discuss whether and when to move to oral, such as the dual capsule at €179.00, after the injection phase.
Correct dosing for condition and weight matters more than cutting corners, because under-dosing can prolong treatment. During treatment, your veterinarian will usually advise avoiding fluoroquinolone antibiotics, spot-on flea medications, lysine, and immune boosters.
FAQ
How much does Feline Infectious Peritonitis (FIP) treatment cost in total in the UK?
The total cost of Feline Infectious Peritonitis (FIP) treatment depends on your cat's weight, the form of FIP, and the 12-week (84-day) protocol, so there is no single figure. Our catalog prices start at €79.00 for the GS-441524 Injectable 20mg/ml, and your veterinarian can help estimate how much product a full course needs for your cat.
Why does Feline Infectious Peritonitis (FIP) treatment cost more for a bigger cat?
GS-441524 injectables for Feline Infectious Peritonitis (FIP) are dosed per kilogram, so a heavier cat needs more milligrams each day and gets through product faster. That is the single biggest driver of total cost, alongside the daily dose for the form of FIP.
Is the oral dual capsule cheaper than injections for Feline Infectious Peritonitis (FIP)?
The CURE FIP™ Dual Antiviral Oral Capsules are listed at €179.00 and are dosed as one capsule a day for your cat's weight class (0 to 2.5 kg / 0 to 5.5 lb, 2.5 to 5 kg / 5.5 to 11 lb, or over 5 kg / over 11 lb), with no mg calculation. They are commonly used after 2 to 4 weeks of GS-441524 injections once your cat is stable, so they usually complement rather than fully replace injections.
Can I get a refund if I change my mind about Feline Infectious Peritonitis (FIP) treatment?
Yes. The one guarantee we offer is that you can cancel any time before your order ships for a full refund. We do not promise a cure, because there are no guarantees in medicine, only the statistical success rates we quote with their sources.
Do I need a veterinarian for Feline Infectious Peritonitis (FIP) treatment?
Yes, veterinary supervision is part of treatment for Feline Infectious Peritonitis (FIP). Your veterinarian confirms the form of FIP, sets the dose for your cat's weight, and decides if and when to move from injections to oral capsules.
If your cat has just been diagnosed, you do not have to face the numbers alone. Explore the full range of GS-441524 options and talk through a plan that fits your cat and your budget with the CureFIP team, and keep your own veterinarian at the centre of every decision.
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