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FELINE INFECTIOUS PERITONITIS — FIP

A reason not to give up,
at a fair price.

Once considered nearly 100% fatal, FIP can now be brought into remission in many cases thanks to GS-441524 based therapy. At FIP Support, we deliver proven treatment protocols and high-quality medication at a fair, accessible price.

100%
Sourced directly from the manufacturer
0
Middleman markup
Trusted
Produced since the MUTIAN era
GS-441524 antiviral
A protocol aimed
at full recovery
Injection 15–25 days
→ transition to oral
→ complete in 84 days
Protocol-basedBased on guidelines from leading research
Quality assuredStrict quality control at the manufacturer
Direct from manufacturerFree shipping · delivered in about 5 days
Relapse supportAdditional treatment support under set conditions
OUR MISSION — Alongside rescue work

FIP Support provides FIP treatment to
rescue organizations at a support price.

No life should be lost to FIP because of treatment cost —
that is where we began, and the promise we continue to keep.

PRICE BREAKTHROUGH — Breaking the cost barrier

A price that lets you keep going.

FIP treatment typically costs $3,334–$6,667 in Japan. Because of high drug prices, many owners are unable to start or continue treatment. Through direct sourcing from the manufacturer, eliminating middleman markup, and fair pricing, FIP Support has reduced medication cost to about one-sixth of the market price.

CASE 01 4 kg · Wet (effusive) form
Typical treatment cost
$3,334+
about 1/6
FIP Support medication cost (incl. tax)
~$552
5 injections ~$118 + 70 oral tablets ~$434
(14 days injection → 70 days oral, 84-day protocol)
CASE 02 4 kg · Dry (non-effusive) form
Typical treatment cost
$6,667+
about 1/6
FIP Support medication cost (incl. tax)
~$1,103
10 injections ~$235 + 140 oral tablets ~$868
(double the wet-form dose, 84-day protocol)

* The figures above are estimated costs for medication supplied by FIP Support. They do not include consultation, testing, or additional treatment fees at the veterinary clinic. Actual dosage and duration should be adjusted by a veterinarian according to the cat's weight, symptoms, and progress. For detailed dosing, see "Protocol" or the "Dosage Calculator".

FOR RESCUE — For those supporting rescue work
For rescue organizations,
we offer a dedicated support price.

For rescue organizations, including cat rescue cafés, we offer a support price even lower than the rates above. Use is subject to confirmation of your organization's rescue activities. Please feel free to reach out via our contact form for details.

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DRY · WET — TWO FORMS OF FIP

Identifying the two forms correctly

FIP is broadly divided into the dry (non-effusive) and wet (effusive) forms, which differ in symptoms, rate of progression, and required dosage. Early diagnosis and a form-appropriate approach greatly affect the prognosis.

— 01 / NON-EFFUSIVE
Dry Form
Dry / Granulomatous

A type in which granulomas (masses of inflammation) form in various organs. Neurological and ocular symptoms are common; progression is slow, but the treatment period is longer.

Main symptoms Hind-limb unsteadiness, seizures, uveitis (clouding/discoloration of the eye), loss of appetite, etc.
— 02 / EFFUSIVE
Wet Form
Wet / Effusive

A type in which vasculitis causes fluid to leak and accumulate in the abdomen or chest. Systemic symptoms are pronounced and progression is relatively fast, so early intervention is essential.

Main symptoms Persistent fever, lethargy, loss of appetite, abdominal distension, difficulty breathing, etc.
PRODUCTS — Treatment lineup

Two forms, for each stage of treatment

View all products
INJECTION 01
GS-441524 Injection
Injection | 20 mg/ml

6 ml vial / 20 mg/ml. For the initial treatment phase (15–25 days), injection is strongly recommended over tablets. We use a low-sting, neutral-pH vial rather than the older "stinging" type.

~$24/ 6 ml
Details →
ORAL 02
GS-441524 Tablet
Oral Tablet | 60 mg / tablet

Used for the oral treatment phase after the injection phase. Please refer to "Protocol" when dosing.

~$7/ tablet
Details →
LATEST COLUMNS — Columns

Deepen your understanding of FIP treatment.

We share treatment protocols, case discussions, and the latest research on note (in Japanese).

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SUPPORT — Beside every single cat

Treatment doesn't end when the medicine ships.

The course of symptoms, fine-tuning the dose, managing side effects — throughout treatment, our support team stays alongside you, providing the information and protocol materials you need. Reach us anytime through our contact form; we reply daily from 11:00 to 18:00 (JST).

Free consultation
"

Real treatment cases and customer stories
are coming soon.

— COMING SOON
Case studies coming soon soon