FIP in Cats: GS-441524
Feline Infectious Peritonitis (FIP) is a devastating viral disease in cats caused by a mutation of the feline coronavirus. Until recently, FIP was considered untreatable and almost always fatal. Today, thanks to advances in veterinary medicine, there is new hope.
At Las Colinas Compounding Pharmacy, we are proud to offer GS-441524 treatment for cats diagnosed with FIP. Our pharmacy is currently one of the only compounding pharmacies in the United States providing the injectable dosage form. We also prepare GS-441524 capsules in multiple strengths to meet the needs of feline patients.
Note: Our injectable and oral formulations have been vetted and validated by Eagle Analytical Labs, Sugarland TX for Sterility, potency and endotoxins. Each new batch is also tested.
GS-441524 Treatment Options
Injectable Formulations
For subcutaneous injections:
- 20 mg/mL sterile 5 mL vials – $45 each
(pricing subject to change)
Capsule Formulations
Flavorless capsules, available in six strengths:
- 10 mg – $2 each
- 20 mg – $6 each
- 35 mg – $8 each
- 50 mg – $10 each
- 75 mg – $11 each
- 100 mg – $12 each
Note: The total mg listed per capsule reflects active GS; approximately 50% of the total amount is bioavailable. Pricing subject to change.

Why Quality Matters
When it comes to FIP treatment, purity and consistency are critical. That’s why all of our GS-441524 formulations undergo third-party laboratory testing for:
- Sterility
- Endotoxins
- Potency
This rigorous testing ensures that your cat receives a product you can trust.
Why Urgency Matters
Cats diagnosed with FIP need immediate care. We understand how urgent treatment can be, which is why we strive to have GS-441524 ready the same day or within 24 hours.
📦 Important: We currently only ship within the state of Texas, and all orders require a valid veterinary prescription.
Relapse Guarantee
At Las Colinas Compounding Pharmacy, we stand behind our products. If your cat relapses after completing an initial 84-day course of treatment, medications will be provided at 50% off.
Conditions: A valid veterinary prescription and proof of relapse (provided by your veterinarian) are required.
Partnering With Veterinarians & Pet Owners
FIP is one of the most challenging diagnoses cat owners can face. By offering GS-441524 injections and capsules, we give veterinarians and pet owners a trusted source for treatment, backed by strict quality controls and fast turnaround times.
Contact us today to learn more about our GS-441524 treatment options for FIP in cats.