• NEW (2025) Knies et al. “Legal treatment of feline infectious peritonitis in the Netherlands.” J Feline Med Surg (2025)
  127 cats treated with legally compounded oral GS-441524. 78% overall survival. Ocular FIP had 100% survival; neurological FIP had 60%. Adverse effects were mild (vomiting 33%, diarrhea 29%).
• NEW (2023) Taylor et al. “Retrospective study of 307 cats with FIP treated with legally sourced compounded remdesivir and GS-441524 (2020–2022).”
  88.6% alive at end of initial treatment; 84.4% at longest follow-up. All three protocols (remdesivir alone, remdesivir then GS-441524, GS-441524 alone) were highly effective.
• NEW (2023) Coggins et al. “Outcomes of treatment of cats with FIP using parenterally administered remdesivir, with or without transition to orally administered GS-441524.”
  86% survival to 6 months, increasing to 96% if alive after first 48 hours of treatment.
• * Pedersen et al. “Efficacy and safety of the nucleoside analog GS-441524 for treatment of cats with naturally occurring FIP.” (2019)
  The landmark study. ~90% success rate for cats surviving past week 1.
• Dickinson et al. “Antiviral treatment using GS-441524 in cats with neurological FIP.” (2020)
  GS-441524 shows efficacy in treating neurological FIP at higher doses (5–10 mg/kg).
• Kent et al. “Unlicensed antiviral products for FIP contain GS-441524 at significantly different amounts than advertised.” JAVMA (2024)
  Analysis of 127 black-market samples: injectables averaged 39% more GS than labeled; oral products varied widely. Highlights the importance of using regulated pharmacy products.

US Compounding Pharmacies Offering GS-441524:

• Stokes Pharmacy (Bova) — Exclusive US partner for Bova formula. 50mg tablets, oral suspension. Ships nationwide.
• Wedgewood Pharmacy — 50mg/mL oral oil suspension, customizable flavors.
• BCP Veterinary Pharmacy — VetChews, capsules, and oral suspension in multiple flavors.
• Avrio Pharmacy — 50mg tablets and oral suspension. Ships to most states.
• Las Colinas Pharmacy — Injectable (20mg/mL) and capsules (10–100mg). Texas-based.

A valid veterinary prescription is required. Contact your veterinarian to discuss FIP diagnosis and treatment.

1. Standard treatment: 84 days (12 weeks) of daily oral GS-441524
2. Oral tablets/suspension are now first-line (replacing daily injections for most cases)
3. Dosing by FIP type: Wet 6 mg/kg, Dry 10 mg/kg, Ocular 10 mg/kg, Neurological 10–15 mg/kg
4. Oral GS has ~50% bioavailability vs injectable, so oral doses are adjusted accordingly
5. Bloodwork monitoring throughout treatment remains important
6. 78–96% survival rates in published clinical studies using regulated products

• Dr. Pedersen's FIP website
• Stokes Pharmacy FIP Resources for Veterinarians
• ZenByCat — FIP Research Funding