FIP Treatment Success Rate: What 92% Really Means

Key takeaway: The widely cited 92% FIP treatment success rate comes from a single UC Davis study of GS-441524 injectable monotherapy (Pedersen, 2019), where 25 of 31 cats reached lasting remission. That figure describes one protocol under veterinary supervision, not a promise for every cat. Your cat's odds depend on the form of FIP, how early treatment starts, completing the full 84-day course, and close monitoring with your veterinarian.

When a cat is diagnosed with Feline Infectious Peritonitis (FIP), the first question most caregivers ask is simple: what are the chances of recovery? Numbers like 92% appear everywhere online, often without context. This guide explains exactly where that figure comes from, what it measures, and the steps that influence your own cat's recovery odds.

What does the 92% FIP treatment success rate actually mean?

The 92% FIP treatment success rate refers to GS-441524 injectable monotherapy in the UC Davis field trial reported by Pedersen and colleagues in 2019, where 25 of 31 cats that completed treatment achieved sustained remission. It is a measured outcome from one defined protocol, not a blanket figure that applies to every cat, every form of FIP, or every product.

This matters because success rates are tied to the specific drug, route, and protocol studied. A statistic only means something when it is attached to the study and the treatment it came from.

GS-441524 is the antiviral at the core of modern FIP treatment, and it is the hero ingredient of CureFIP. The evidence shows it can drive FIP into remission when used at the right dose, every day, for the full course under veterinary care.

We are clear about what the data shows and what it does not. A 92% success rate is strong, but it also means the data documented cases that did not respond, which is why veterinary monitoring throughout treatment is essential.

What was the UC Davis FIP trial?

The UC Davis FIP trial (Pedersen et al., PMC6435921) followed 31 cats with naturally occurring FIP treated with GS-441524, and reported a 92% success rate among cats that completed the protocol. It remains one of the most referenced clinical datasets in FIP treatment and is the source of the 92% figure.

The trial established the framework that most reputable protocols still follow today: a daily dose calibrated to the cat's weight and the form of FIP, given over a 12-week (84-day) course.

Since that research, the broader treatment community has grown rapidly. Across the CureFIP network, more than 100,000 cats have been treated since 2019, which reflects how far access to GS-441524 has come. If you are just starting out, our practical guide for cat owners walks through what the journey looks like.

How do the four forms of FIP affect recovery odds?

FIP takes four forms, wet, dry, ocular, and neurological, and each one shapes the dose and the treatment plan. The form your cat has is one of the biggest factors in both dosing and monitoring, which is why diagnosis with your veterinarian comes first. If your vet has only just raised the possibility, our guide on what to do when FIP is suspected can help you stay calm and organized.

The GS-441524 injectable dose rises with the forms that are harder to reach, particularly those that involve the eyes and the central nervous system. Below, each form is shown with its catalog dose so the symptoms and the dosing stay aligned.

Wet (effusive) FIP

Wet FIP causes fluid to build up in the abdomen or chest, often leading to a swollen belly or labored breathing. It is frequently the fastest form to show visible signs, which can mean earlier diagnosis.

For wet FIP, the GS-441524 Antiviral Injectables are dosed at 6 mg/kg, given as one subcutaneous injection per day for 84 days, per the UC Davis reference (Pedersen et al., PMC6435921).

Dry (non-effusive) FIP

Dry FIP produces little or no fluid and instead causes inflammatory masses in organs, which can make it harder to spot early. Signs may be vaguer, such as weight loss, fever, and lethargy.

For dry FIP, the GS-441524 Antiviral Injectables are dosed at 8 mg/kg, given as one subcutaneous injection per day for 84 days, per the UC Davis reference (Pedersen et al., PMC6435921).

Ocular FIP

Ocular FIP affects the eyes, with signs such as color changes in the iris, cloudiness, or inflammation. Because the eye is a harder compartment for the antiviral to reach, the dose is higher.

For ocular FIP, the GS-441524 Antiviral Injectables are dosed at 10 mg/kg, given as one subcutaneous injection per day for 84 days, per the UC Davis reference (Pedersen et al., PMC6435921).

Neurological FIP

Neurological FIP involves the brain and spinal cord, with signs such as wobbliness, seizures, or behavior changes. Like the eyes, the central nervous system requires a higher dose to achieve adequate drug levels.

For neurological FIP, the GS-441524 Antiviral Injectables are dosed at 10 mg/kg, given as one subcutaneous injection per day for 84 days, per the UC Davis reference (Pedersen et al., PMC6435921).

What is the dosing by FIP form and product strength?

The dose depends on the form of FIP, and CureFIP offers three injectable concentrations so the volume can be matched to your cat. The figures below come directly from the live catalog.

FIP form	GS-441524 injectable dose	Schedule	Duration
Wet	6 mg/kg	1 subcutaneous injection per day	84 days
Dry	8 mg/kg	1 subcutaneous injection per day	84 days
Ocular	10 mg/kg	1 subcutaneous injection per day	84 days
Neurological	10 mg/kg	1 subcutaneous injection per day	84 days

The available injectable strengths and prices are:

Product	Strength	Price
GS-441524 Antiviral Injectables	20 mg/ml	AED359.00
GS-441524 Antiviral Injectables	30 mg/ml 10ML	AED479.00
GS-441524 Antiviral Injectables	40 mg/ml	AED599.00

Your veterinarian will confirm the exact volume based on your cat's weight, form of FIP, and response to treatment. Never adjust a dose on your own.

What is the success rate for dual antiviral treatment?

The dual antiviral approach, combining GS-441524 with EIDD-1931, reported a 78.3% remission rate in Li and Cheah (2025). This is a separate, product-matched figure from the 92% monotherapy result and the two should never be combined or averaged, because they describe different treatments studied under different conditions.

The CURE FIP™ Dual Antiviral Oral Capsules (GS-441524 + EIDD-1931) are priced at AED499.00 and are positioned for wet and dry FIP. In some regions they are not recommended once ocular or neurological signs are present, or if the cat cannot eat or defecate.

The rationale for adding a second antiviral is mechanistic, not about raising the GS-441524 amount. Our article on why two antivirals are now used together in the GCC explains the thinking, and a companion piece explains why the most advanced capsule is not the one with the most GS-441524.

Here is how the two routes compare at a glance, using only product-matched figures.

Treatment	Product	Matched success figure	Source
GS-441524 monotherapy (injectable)	GS-441524 Antiviral Injectables	92% success rate	UC Davis, Pedersen et al. (PMC6435921)
Dual antiviral (oral)	CURE FIP™ Dual Antiviral Oral Capsules (GS-441524 + EIDD-1931)	78.3% remission	Li and Cheah (2025)

How can you maximize your cat's chances of remission?

You maximize your cat's chances by starting treatment early, dosing correctly for the form of FIP, completing the full 84-day protocol without skipped days, and monitoring closely with your veterinarian. Consistency over the entire course is one of the most controllable factors in recovery odds.

Here are the steps that have the biggest influence:

1. Confirm the diagnosis and the form of FIP with your veterinarian before starting, so the dose is correct from day one.

2. Begin treatment as early as possible, because earlier intervention generally gives the antiviral more ground to work with.

3. Give every dose, every day, for the full 84 days, even after your cat looks well again.

4. Track progress with regular bloodwork, since lab values reveal what symptoms alone cannot.

5. Watch for relapse signs during and after treatment and report changes to your veterinarian promptly.

Bloodwork is your window into how treatment is going. Our guide to reading FIP blood test results during treatment helps you understand what each value is telling you, and the GS-441524 treatment timeline sets expectations for each phase.

Recovery does not end on day 84. Supporting your cat through the observation period matters, and our advice on supporting recovery after FIP treatment covers that final stretch.

Why might a cat not reach remission?

A cat may not reach remission because treatment started too late, the dose was too low for the form of FIP, doses were missed, or the cat had additional health complications. The UC Davis 92% figure itself reflects that a portion of cats did not respond, which is why no outcome is ever guaranteed.

Relapse is also possible, often within the weeks after the course ends. Understanding why FIP relapse happens and what to do helps you act quickly if signs return. In every case, decisions about restarting or extending treatment belong with your veterinarian.

FAQ

Is the 92% FIP success rate a guarantee my cat will recover?

No. The 92% figure is a measured outcome from the UC Davis monotherapy trial (Pedersen, 2019), where 25 of 31 cats reached remission. It describes one protocol's results and cannot guarantee an individual cat's outcome, which depends on the form of FIP, timing, and veterinary care.

Why is the dual antiviral success rate 78.3% and not 92%?

The 78.3% remission figure comes from Li and Cheah (2025) for the GS-441524 plus EIDD-1931 dual antiviral approach, while the 92% comes from UC Davis GS-441524 injectable monotherapy (Pedersen, 2019). They are separate studies of different treatments, so the figures are reported independently and are never averaged together.

Does the form of FIP change the GS-441524 dose?

Yes. The GS-441524 Antiviral Injectables are dosed at 6 mg/kg for wet, 8 mg/kg for dry, and 10 mg/kg for both ocular and neurological FIP, given once daily for 84 days. The eyes and central nervous system require higher doses, so an accurate diagnosis from your veterinarian is essential.

How long is the FIP treatment protocol?

The standard course runs 84 days (12 weeks) under veterinary supervision. Finishing the full course matters even when your cat appears healthy earlier, because stopping early raises the risk of relapse.

How many cats have been treated with GS-441524?

Across the CureFIP network, more than 100,000 cats have been treated since 2019. This reflects how widely GS-441524 based treatment is now used, though every cat's plan should still be guided by a veterinarian.

If your cat has been diagnosed with FIP, the best next step is to understand your options clearly and act with your veterinary team. You can explore the available GS-441524 treatments and talk with our team at CureFIP GCC, then work alongside your own veterinarian to choose the plan that fits your cat. Clear information and close monitoring give you the strongest footing for the road ahead.