Can a Cat With FIP Still Be Treated? A Filipino Guide

Key takeaway: Yes, a cat with FIP can still be treated, and the odds today are better than they have ever been. Feline Infectious Peritonitis (FIP) was once considered hopeless, but since 2019 more than 100,000 cats have been treated with antiviral therapy built around GS-441524. With an early diagnosis, a full 84-day protocol, and close work with your veterinarian, many cats reach remission and go on to live full lives.

If you are reading this in the middle of a scary diagnosis, take a breath. You are not the first Pawrent to face this, and there is a clear path forward.

Magagamot pa ba ang pusa na may FIP?

Yes, FIP is treatable today, and that is the single most important thing for any Filipino Pawrent to know. FIP is caused by a mutated form of a common feline coronavirus, and antiviral medicines can now stop the virus from replicating long enough for your cat's body to recover.

The main treatment is GS-441524, a nucleoside analogue antiviral. In a UC Davis clinical trial, GS-441524 showed a 92% success rate for cats with FIP. That is a dramatic change from just a few years ago, when most cats with FIP did not survive.

Treatment is a journey, and it works best when you start early and finish the full course. Your cat's recovery journey begins with the right diagnosis from your veterinarian.

What is FIP and what are the four forms?

FIP is a serious viral disease that develops when a feline coronavirus mutates inside the cat's body. It can affect the abdomen, chest, eyes, brain, and other organs, which is why early signs can look so different from cat to cat.

FIP has four recognized forms, and knowing which one your cat has shapes the treatment plan:

• Wet (effusive) FIP: fluid builds up in the abdomen or chest, causing a swollen belly or trouble breathing.

• Dry (non-effusive) FIP: no major fluid buildup, but inflammation affects internal organs, often with weight loss and fever.

• Ocular FIP: the eyes are affected, with cloudiness, color changes, or vision problems.

• Neurological FIP: the brain and spinal cord are involved, causing wobbliness, seizures, or behavior changes.

Ocular and neurological FIP are two separate forms, not one combined category. This matters because they need higher antiviral dosing and a specific treatment route.

What antiviral treatments does BasmiFIP offer for FIP?

BasmiFIP treats FIP with antiviral medicines built around GS-441524, plus EIDD-1931 options for the right cases. The goal of every protocol is to suppress the virus across a full 12-week (84-day) course so your cat can reach remission.

Here are the core BasmiFIP antiviral options:

1. GS-441524 injectable (Basmi FIP Antiviral): 40 mg/ml, 99.4% purity, in an 8 ml vial. This is the primary FIP antiviral, given as a daily injection, 7 days a week, for 84 days.

2. EIDD-1931 oral capsules: 15 mg per capsule. Indicated for wet and dry FIP only.

3. Dual Antiviral oral capsules (GS-441524 + EIDD-1931): one capsule per day, used after about 30 days of injections or once your cat is stable.

A quick note on potency: EIDD-1931 is roughly 7.3x more potent than GS-441524, and up to 10x more potent than molnupiravir. To understand how two medicines work together in one capsule, this explainer on dual antiviral therapy for FIP walks through the science in plain language.

Which FIP treatment route fits which cat?

The right route depends on the form of FIP and whether your cat is eating and pooping normally. Cats with ocular or neurological signs need GS-441524 injections, while many wet or dry cases without those signs may start with oral capsules.

The dosing below is by FIP form, and your veterinarian sets the exact plan for your cat:

FIP form	Starting route	GS-441524 dose
Wet (effusive)	Injection or oral option	6 mg/kg
Dry (non-effusive)	Injection or oral option	8 mg/kg
Ocular	GS-441524 injection	10 mg/kg
Neurological	GS-441524 injection	10 mg/kg

The regimen logic is straightforward:

• Wet or dry FIP without ocular or neurological signs: your cat may start EIDD-1931 oral capsules for 30 days. If symptoms persist, treatment can extend. If they continue past 60 days, the plan may switch to GS-441524 at 10 mg/kg.

• Ocular or neurological FIP, or cats not eating or pooping normally: start GS-441524 injections for 30 days, then your veterinarian may switch to the GS-441524 dual antiviral capsule.

EIDD-1931 oral capsules are not recommended for ocular or neurological FIP, or for cats that are not eating or defecating normally. Important safety note: EIDD-1931 is potentially teratogenic, so it should never be given to pregnant, nursing, or breeding cats.

How are the oral capsules dosed by weight?

EIDD-1931 oral capsules are dosed by weight, with a simple banding system. Your veterinarian confirms your cat's weight and the right schedule before you begin.

Cat weight	EIDD-1931 capsules
Under 2.5 kg	1 capsule every 12 hours
2.5 to 5 kg	2 capsules every 12 hours
Over 5 kg	3 capsules every 12 hours

The once-daily Dual Antiviral capsule is dosed differently. For cats under 2.5 kg it provides GS-441524 25 mg plus EIDD-1931 5 mg; for 2.5 to 5 kg it provides GS-441524 35 mg plus EIDD-1931 8 mg; and for cats over 5 kg it provides GS-441524 50 mg plus EIDD-1931 10 mg.

The Dual Antiviral capsule is used after about 30 days of injections or once your cat is stable. It is not used during ocular or neurological symptoms, during vomiting or diarrhea, or for cats under 1 year with wet FIP.

How long does FIP treatment take?

The standard FIP protocol is 84 days, which is 12 full weeks. Finishing the entire course matters, even when your cat looks healthy again well before day 84.

Many families see appetite return, fever drop, and energy improve within the first few weeks. That is encouraging, but the virus needs the full course to be suppressed properly.

Stopping early is one of the biggest causes of relapse. A formula designed to stay effective across the whole protocol matters, which is why this piece on why an 84-day FIP formula is built to last is worth a read before you begin.

What success rates can Filipino Pawrents expect?

The headline figure for GS-441524 is a 92% success rate, reported in the UC Davis clinical trial. For dual-antiviral therapy combining GS-441524 and EIDD-1931, a field study by Li and Cheah (2025) reported 78.3% remission, including some cats that had previously relapsed.

These are two different studies with two different numbers, so it helps to read them in context rather than blending them. The full breakdown of the dual-antiviral results is summarized in this 78.3% recovery study report.

No treatment can promise an outcome for an individual cat, and your veterinarian is the best person to weigh your cat's specific situation. What the track record does show is that recovery is realistic and common when treatment is done properly.

How is FIP diagnosed and monitored during treatment?

FIP is diagnosed by your veterinarian using a combination of clinical signs, bloodwork, and sometimes fluid analysis or imaging. Because no single test is perfect, your vet looks at the whole picture before confirming FIP.

During treatment, regular bloodwork helps track progress and confirm your cat is responding. Values like globulin, albumin, hematocrit, and the A:G ratio often move in encouraging directions as the virus is suppressed.

Learning to read these results makes the journey less stressful. This guide on what FIP blood test results really mean during treatment is written specifically for Filipino cat parents who want to understand the numbers.

What should you avoid during FIP treatment?

Some medicines and products can interfere with FIP antiviral treatment and should be avoided unless your veterinarian directs otherwise. Keeping the protocol clean gives the antiviral the best chance to work.

During FIP treatment, avoid these:

• Fluoroquinolone antibiotics

• Spot-on flea medications

• Lysine supplements

• Immune boosters

Always tell your veterinarian about every product, supplement, and medication your cat is taking. Many Pawrents find it reassuring to hear how local vets approach these choices, and this collection of honest conversations from Philippine veterinarians reflects real experiences from clinics here.

Can supportive supplements help during FIP treatment?

Supportive nutraceuticals can help with organ health alongside antiviral treatment, but they do not treat FIP themselves. They are adjuncts, not antivirals, and they never replace GS-441524 or EIDD-1931 therapy.

BasmiFIP offers two supportive options through RX Sciences:

• LiverRx: a liver-support tablet containing SAMe, Silybin A+B (milk thistle), Vitamin E, and Vitamin C.

• KidneyRx: a kidney-support tablet with ingredients like Omega-3, L-Carnitine, and cranberry extract.

Think of these as helping the organs cope during a demanding 84-day journey, while the antiviral does the work against the virus. Your veterinarian can advise whether either fits your cat's plan.

FAQ

Is FIP curable?

FIP is treatable, and many cats reach remission with antiviral therapy, though no treatment can guarantee an outcome for any individual cat. The GS-441524 success rate reported in the UC Davis clinical trial is 92%, and recovery is realistic when treatment starts early and the full 84-day course is completed under your veterinarian's care.

How long is the FIP treatment protocol?

The standard FIP protocol is 84 days, which is 12 weeks. Even if your cat looks fully recovered earlier, finishing the entire course is important to reduce the risk of relapse.

Can wet and dry FIP be treated with oral capsules?

Yes, EIDD-1931 oral capsules are indicated for wet and dry FIP only, and many cases without ocular or neurological signs may start this way. Ocular and neurological FIP require GS-441524 injections instead, because those forms need a different dosing approach.

Is FIP treatment safe for a pregnant cat?

EIDD-1931 is potentially teratogenic and should never be given to pregnant, nursing, or breeding cats. If your cat is pregnant or nursing, tell your veterinarian right away so a safe plan can be discussed.

What is the difference between the 92% and 78.3% figures?

The 92% success rate comes from the UC Davis clinical trial of GS-441524, while the 78.3% remission figure comes from the Li and Cheah (2025) field study of dual-antiviral therapy combining GS-441524 and EIDD-1931. They are separate studies measuring different protocols, so they should not be combined into one number.

Your cat's diagnosis does not have to be the end of the story, and you do not have to figure this out alone. To understand the available options and the next steps, talk with the BasmiFIP team in the Philippines and bring what you learn to your own veterinarian, who can guide the right plan for your cat.