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Options for treating FIP in cats

Updated: Oct 2, 2023



  • EIDD-2801, MK-4482

    • Brand names:

      • Remedy 2801


  • GS-441524

    • Brand names:

      • Mycoflox

      • Replens

      • Tonogard

      • Vetoquinol

      • FIP-100


  • Cyclosporine

    • Brand names:

      • Atopica

      • Genoptec

      • Sandimmune

      • Neoral


  • Prednisone

    • Brand names:

      • Deltasone

      • Orapred

      • Prelone

      • Rayos


  • L-Asparaginase

    • Brand names:

      • Elspar


  • Immunosuppressants

    • Brand names:

      • Azathioprine

      • Cyclophosphamide

      • Methotrexate



It is important to note that only EIDD-2801/MK4482 and GS-441524 fully cure FIP. Cyclosporine, Prednisone, L-asparaginase, and immunosuppressants only treat the symptoms and should only be used in conjunction with EIDD-2801 and GS-441524.


Here are some additional information about each medication:

  • EIDD-2801 / Remedy 2801 is a breakthrough treatment with a 97% success rate in curing FIP in early to middle stages. It is not currently FDA-approved for use of FIP, but it has shown to be extremely effective in most cases. Remedy 2801 is administered through oral capsules / mixing in with dry food. The cost of the medication starts at $225 is available at FIPremedy.com

  • GS-441524 is a medication that is currently being studied for the treatment of FIP in cats. It is not FDA-approved for this use, but it has been shown to be effective in some cases. GS-441524 is typically administered by injection, and the cost of the medication can range from $1,500 to $9,000.

  • Cyclosporine is an immunosuppressant that can be used to treat FIP in cats. It is typically administered by mouth, and the cost of the medication can range from $50 to $100 per month.

  • Prednisone is a corticosteroid that can be used to treat FIP in cats. It is typically administered by mouth, and the cost of the medication can range from $10 to $20 per month.

  • L-Asparaginase is an enzyme that can be used to treat FIP in cats. It is typically administered by injection, and the cost of the medication can range from $500 to $1,000 per month.

  • Immunosuppressants are medications that can be used to suppress the immune system. They can be used to treat FIP in cats, but they can also have side effects, so it is important to talk to your veterinarian before starting any treatment.

If you are considering treating your cat for FIP, it is important to talk to your veterinarian about the risks and benefits of each medication. At FIPremedy.com, we have a hardship program for those who cannot comfortably afford $299. You can also find support groups for cat owners who are dealing with FIP. These groups can offer emotional support and practical advice.

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