GS-441524 for Cats: Dosage, Price & Buying Guide PH

If your cat has just been diagnosed with Feline Infectious Peritonitis (FIP), you have probably already typed "GS-441524" into Google more times than you can count. You are not alone. Across Metro Manila to Mindanao, Filipino cat parents are racing against the clock to understand this antiviral, what it costs, and where to buy it safely.

This guide is written for you. It covers what GS-441524 actually is, how it is dosed by FIP form, what realistic pricing looks like in the Philippines, the safety rules every cat parent should know, and how to avoid the counterfeit market. Here is what cat parents need to know.

GS-441524 for Cats: Dosage, Price & Buying Guide PH

What Is GS-441524?

GS-441524 is a nucleoside analogue antiviral. In simple terms, it blocks the FIP virus from copying itself inside your cat's cells. Once viral replication stops, the immune system gets a fighting chance to recover.

The molecule was first studied at UC Davis by Dr. Niels Pedersen and his team. Their landmark clinical work reported a commonly cited 92% success rate for GS-441524 in cats with FIP, a figure that transformed FIP from a near-certain death sentence into a treatable disease. Globally, more than 100,000 cats have been treated through community and clinical networks since 2019.

At BasmiFIP, GS-441524 is a hero ingredient. It anchors our injectable antiviral and our dual antiviral capsule, and it is the backbone of the standard 84-day (12-week) FIP protocol.

The Four Forms of FIP (And Why It Matters for Dosing)

Before we talk dosage, your vet needs to identify which form of FIP your cat has. There are four:

1. Wet (effusive) FIP, with fluid buildup in the abdomen or chest

2. Dry (non-effusive) FIP, with granulomas in organs but no fluid

3. Ocular FIP, affecting the eyes

4. Neurological FIP, affecting the brain and spinal cord

Ocular and neurological FIP are two separate forms, not one. This matters because they require higher GS-441524 dosing to cross the blood-eye and blood-brain barriers.

GS-441524 Dosage by FIP Form

The BasmiFIP GS-441524 injectable is 40 mg/ml, 99.4% purity, in an 8 ml vial. Injections are given subcutaneously once daily, 7 days a week, for the full 84-day protocol.

Dosing depends on the form of FIP:

• Wet FIP: 6 mg/kg daily

• Dry FIP: 8 mg/kg daily

• Ocular FIP: 10 mg/kg daily

• Neurological FIP: 10 mg/kg daily

Your veterinarian will weigh your cat weekly and adjust the dose as your cat (hopefully) gains weight back. Slow responders may need dose increases, which is normal and well documented in field experience.

When Oral Capsules Come Into the Picture

Many Filipino cat parents ask: can we skip injections and just give pills? The honest answer is, it depends on the form and stage.

BasmiFIP Dual Antiviral Capsules combine GS-441524 with EIDD-1931 in a single daily capsule. Dosing by weight:

• Under 2.5 kg: GS-441524 25 mg + EIDD-1931 5 mg

• 2.5 to 5 kg: GS-441524 35 mg + EIDD-1931 8 mg

• Over 5 kg: GS-441524 50 mg + EIDD-1931 10 mg

The dual capsule is typically introduced after about 30 days of injections, or once the cat is clinically stable. It is not appropriate during active ocular or neurological symptoms, during vomiting or diarrhea, or for cats under 1 year of age with wet FIP.

EIDD-1931 alone (15 mg capsules) is indicated only for wet and dry FIP, never for ocular or neurological FIP, and not for cats who are not eating or defecating normally. Dosing is one capsule every 12 hours per 2.5 kg of body weight.

Important safety note: EIDD-1931 is potentially teratogenic. It must never be given to pregnant, nursing, or breeding cats.

Why Dual Antiviral Therapy?

EIDD-1931 is roughly 7.3 times more potent than GS-441524 on a molecular basis, and up to 10 times more potent than molnupiravir. When combined, the two drugs hit the virus through two different mechanisms, which is why field outcomes for dual therapy have been so encouraging.

A 2025 field study by Li and Cheah reported a 78.3% remission rate in 46 cats treated with combined GS-441524 and EIDD-1931. That figure should not be confused with the 92% UC Davis number for GS-441524 monotherapy. Different studies, different protocols, different patient populations. Both numbers are real, but they are not interchangeable.

The takeaway: two drugs, one capsule, better outcomes for the right candidates.

GS-441524 Price in the Philippines: What to Expect

Let us be transparent. Filipino cat parents sacrifice a lot to afford FIP treatment, and they deserve straight talk on pricing.

GS-441524 cost depends on three things:

1. Your cat's weight. A 2 kg kitten needs far less drug than a 6 kg adult.

2. The form of FIP. Neurological and ocular cases require 10 mg/kg, so they use more drug per day.

3. The full 84-day protocol. Cutting treatment short is the leading cause of relapse.

A realistic Philippine budget plans for the entire 84 days upfront, plus periodic bloodwork (CBC, chemistry panel, A:G ratio, globulin, ALT, SDMA) to monitor recovery. Splitting payment by month is common, but the protocol itself should never be split or interrupted.

BasmiFIP offers nationwide delivery from Metro Manila to Mindanao, and a free expert consultation to help you map out the right protocol and total cost for your cat's specific case. We would rather you have an honest number than a surprise halfway through treatment.

Buying GS-441524 Safely: How to Avoid Counterfeits

The sad reality is that the FIP community has been flooded with counterfeit GS-441524. Underdosed vials, contaminated batches, and mislabeled concentrations have cost cats their lives. Here is how to protect yours.

1. Verify the Concentration

Legitimate GS-441524 injectable should be clearly labeled with mg/ml. BasmiFIP's injectable is 40 mg/ml at 99.4% purity. If a seller cannot tell you the exact concentration and purity, walk away.

2. Demand Veterinary Supervision

A reputable supplier will insist your cat is under veterinary care. Anyone willing to sell you antivirals without diagnostic confirmation of FIP is not protecting your cat.

3. Check for Real Consultation Support

FIP treatment is not a hand-off transaction. You will have questions at week 2, week 6, and week 10. A trustworthy supplier offers ongoing consultation, not just a shipment.

4. Ask About Drug Interactions

During FIP treatment, your cat should avoid fluoroquinolone antibiotics, spot-on flea medications, lysine, and immune boosters. A serious supplier will warn you about these unprompted.

Week by Week: What the 84-Day Protocol Looks Like

• Weeks 1 to 2: Fever often breaks within 24 to 72 hours. Appetite returns. Effusion begins to resolve in wet cases.

• Weeks 3 to 4: Weight gain becomes visible. Globulin starts trending down, albumin starts trending up, A:G ratio improves.

• Weeks 5 to 8: Energy and play behavior return. Bloodwork normalizes for most cats. This is where many parents are tempted to stop. Do not stop.

• Weeks 9 to 12: Final consolidation. The virus is being driven below the threshold where it can rebound. Completing the full 84 days dramatically lowers relapse risk.

• Post-treatment observation (12 weeks): Watch for any returning symptoms. Most relapses, when they occur, show up in this window and are usually treatable with an extended or repeated course.

Supportive Care: Where LiverRx and KidneyRx Fit In

GS-441524 does the antiviral work. But FIP and the treatment journey can stress the liver and kidneys, especially in cats who arrived very sick.

LiverRx (for cats and small dogs) contains SAMe 90 mg, Silybin A+B 9 mg, Vitamin E 13 mg, and Vitamin C 10 mg. It supports liver function during and after antiviral therapy.

KidneyRx provides magnesium, Vitamin D, calcium, L-Carnitine, chitosan, Omega-3, and cranberry extract to support kidney health.

Be clear on this: LiverRx and KidneyRx are adjunct organ support. They are not antivirals. They do not treat FIP. They support your cat's organs while GS-441524 does the antiviral heavy lifting, always under veterinary guidance.

Give Your Cat the Best Chance

FIP used to be a goodbye. With GS-441524, the right protocol, veterinary supervision, and a complete 84 days, it is a recovery story for the majority of cats. Filipino cat parents deserve a formula built to last 84 days, transparent pricing, and a team that picks up the phone when you have questions at 11 pm on week six.

That is what BasmiFIP is built to do. From Metro Manila to Mindanao, fast nationwide delivery and free expert consultation are one message away.

FAQ

Is GS-441524 safe for kittens?

Yes, GS-441524 is used in kittens under veterinary supervision, with dosing adjusted by weight and form of FIP. Kittens often respond very well. The dual antiviral capsule, however, is not recommended for cats under 1 year of age with wet FIP.

How quickly will I see improvement after starting GS-441524?

Most cats show fever reduction within 24 to 72 hours, with appetite returning in the first week. Weight gain and improved bloodwork (declining globulin, improving A:G ratio) typically follow in weeks 2 to 4.

Can I stop treatment early if my cat looks completely normal at week 6?

No. Stopping early is the single biggest cause of FIP relapse. The 84-day protocol is designed to drive viral load below the rebound threshold. Always complete the full 12 weeks.

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

The 92% figure comes from UC Davis clinical work on GS-441524 monotherapy. The 78.3% figure comes from the Li and Cheah 2025 field study of combined GS-441524 plus EIDD-1931 in 46 cats. They are different studies with different protocols, not directly comparable.

Can I give GS-441524 alongside my cat's regular flea medication?

No. Spot-on flea medications, fluoroquinolone antibiotics, lysine, and immune boosters should all be avoided during the 84-day protocol. Talk to your vet about safe alternatives for parasite prevention during treatment.

How do I order GS-441524 from BasmiFIP in the Philippines?

Reach out through basmifipphilippines.com for a free expert consultation. We will review your cat's diagnosis, weight, and FIP form, then recommend the right protocol and arrange nationwide delivery from Metro Manila to Mindanao.