Question 1

What is GS-441524 used for in cats?

Accepted Answer

GS-441524 is a nucleoside analogue antiviral used to treat Feline Infectious Peritonitis (FIP) in cats. It works by blocking the replication of the feline infectious peritonitis virus (FIPV). It is the most evidence-backed antiviral treatment for FIP and forms the foundation of the modern 84-day treatment protocol, typically combined with EIDD-1931 for dual-antiviral therapy.

Question 2

Which GS-441524 strength does my cat need?

Accepted Answer

The right strength depends on your cat's weight and FIP form. As a general guide: 20mg/ml is suitable for kittens, small cats, and wet FIP cases. 30mg/ml suits most adult cats and dry FIP. 40mg/ml is used for larger cats and neurological or ocular FIP, which require higher doses. The CureFIP Dosage Calculator gives the exact daily dose and recommends the right vial strength based on your cat's weight and FIP form.

Question 3

What is the difference between GS-441524 with and without B12?

Accepted Answer

B12 versions of GS-441524 include vitamin B12 (cobalamin) added to the injection. B12 supports red blood cell production and nerve function, both of which can be compromised during FIP. The B12 version is commonly recommended for cats showing significant weight loss, anemia, neurological symptoms, or general weakness. The antiviral effect of GS-441524 itself is the same in both versions.

Question 4

How long does GS-441524 treatment take?

Accepted Answer

The standard GS-441524 treatment protocol for FIP is 84 days (12 weeks) of daily injections, followed by a 12-week observation period before a cat is considered in long-term remission. Treatment is typically not stopped early even if the cat appears recovered, because stopping early is the most common cause of relapse.

Question 5

When will I see results from GS-441524?

Accepted Answer

Most cats show visible improvement within 3 to 7 days of starting GS-441524. Fever usually resolves first, followed by appetite returning and energy improving. Weight gain typically starts within the first 2 weeks. The Li and Cheah (2025) field study of 46 cats treated with combined GS-441524 and EIDD-1931 reported a 78.3% remission rate with a 6.5% relapse rate.

Question 6

Are GS-441524 injections painful for cats?

Accepted Answer

GS-441524 injections can sting for a few seconds during subcutaneous administration, which is why higher-strength formulations (40mg/ml) are preferred when smaller volumes can deliver the required dose. Many owners use a numbing routine, warm the vial to body temperature, inject slowly, and reward the cat afterwards. Most cats tolerate the daily routine within the first week.

Question 7

Where can I buy GS-441524 legally?

Accepted Answer

GS-441524 is available through verified FIP treatment suppliers such as CureFIP. Since 2019, CureFIP has supported the treatment of more than 100,000 cats globally with FIP, providing GMP-manufactured GS-441524 in multiple injectable and oral capsule formats. Orders typically ship internationally with tracked delivery and access to dosing support.

Question 8

Can I use GS-441524 oral capsules instead of injections?

Accepted Answer

Oral capsules are an option for wet and dry FIP and are generally easier for owners to administer. However, neurological and ocular FIP cases require injectable GS-441524 because the higher serum concentrations achieved via injection are needed to cross the blood-brain barrier and reach inflamed eye tissues effectively. Your vet or the CureFIP dosing team can advise which format is right for your cat's FIP form.

CureFIP™ GS-441524 Injectable 20mg/ml

CureFIP™ GS-441524 Injectable 20mg/ml

CureFIP™ GS-441524 Injectable 30mg/ml

Cure FIP Antiviral,【40mg/ml】

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GS-441524
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CURA FIP™ Latin America
CURE FIP™ North America
CURE FIP™ Brasil
CURE FIP™ GCC
CURE FIP™ Japan
CURE FIP™ Korea
CURE FIP™ Oceania

CureFIP™ GS-441524 Injectable 20mg/ml

CureFIP™ GS-441524 Injectable 20mg/ml

CureFIP™ GS-441524 Injectable 30mg/ml

Cure FIP Antiviral,【40mg/ml】

Write to Us Frequent Ask Questions GS-441524 Relapse Policy What is FIP? About Us

CURA FIP™ Latin America CURE FIP™ North America CURE FIP™ Brasil CURE FIP™ GCC CURE FIP™ Japan CURE FIP™ Korea CURE FIP™ Oceania

Write to Us
Frequent Ask Questions
GS-441524
Relapse Policy
What is FIP?
About Us

CURA FIP™ Latin America
CURE FIP™ North America
CURE FIP™ Brasil
CURE FIP™ GCC
CURE FIP™ Japan
CURE FIP™ Korea
CURE FIP™ Oceania