FDA Stance on GS-441524 & Why Harmony is the Trusted Choice for FIP Treatment

The FDA recently clarified its position on GS-441524, the antiviral drug that has transformed Feline Infectious Peritonitis (FIP) from a fatal disease to a treatable condition.
You can read the full FDA statement on their website.

What the FDA Says

  • GS-441524 is not yet FDA-approved for veterinary use.

  • Its use is permitted under compassionate care to save the lives of cats with FIP.

  • Compounding pharmacies, veterinarians, and companies such as Harmony all operate under the same legal allowance. None are fully FDA approved, but all are allowed to provide GS-441524 under current compassionate-use guidance.

Myth vs Fact: Is Harmony “Black Market”?

Some online discussions suggest compounding pharmacies are legal while Harmony is not.

Fact: No supplier, pharmacy or otherwise, has FDA approval to sell GS-441524.
All providers, including Harmony, are allowed to offer it under compassionate-use guidance until the FDA issues further direction.

Harmony and Compounding Pharmacies: Key Points

Average Treatment Cost (84 days)

  • Harmony FIP Meds: around $275

  • Compounding Pharmacies: often $1,000 or more

Years of Experience

  • Harmony: over 5 years with GS-441524 since 2020

  • Compounding Pharmacies: frequently new to GS-441524

Focus

  • Harmony: dedicated to FIP treatment only

  • Compounding Pharmacies: GS-441524 is one of many products

Dosing Support

  • Harmony: free dosing guidance and weight-based adjustments

  • Compounding Pharmacies: prescription only, typically without ongoing support

Rescue Sponsorship

  • Harmony: sponsors hundreds of cases each year

  • Compounding Pharmacies: rarely offer sponsorships

Prescription Requirement

  • Harmony: not required, saving many families significant veterinary testing costs

  • Compounding Pharmacies: prescriptions and extra testing are usually required

Why Harmony Remains a Trusted Source

  • Experience: Thousands of cats helped since 2020

  • Affordability: Treatment kept accessible without unnecessary markups

  • Guidance: Free dosing support because correct dosing is critical

  • Rescue Commitment: Ongoing sponsorships for shelters and families in need

Bottom Line

Until GS-441524 receives formal FDA approval, all suppliers are working under the same compassionate-use allowance. The priority remains saving lives, not restricting access or increasing costs.

For full details on FIP treatment, dosing support, or rescue sponsorships, visit HarmonyFIPMeds.com.

Harmony FIP Support