FIP Advocates and Champions

GS-441524
Dosage Guide & Calculator

FIP Advocates and Champions Canada is a group dedicated to providing help, support and hope for those facing this diagnosis. Though once a completely fatal disease, there is now a highly effective treatment and cure!

Partnered with researchers, veterinarians, and pet parents, we are committed to connecting parents with safe and affordable treatment options, advocating for the cats and their parents and helping advance knowledge about FIP and its treatment.

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GS-441524

Dosage Guide and Calculator

Oral GS Dosages:

  • 15 mg/kg/day for wet or dry FIP  that does NOT have ocular or neurological involvement
  • 20 mg/kg/day for ocular FIP
  • 10 mg/kg q12hr (20 mg/kg/day) for neurological FIP
**Some cats may benefit from the dose being split into 12 hour dosing to optimize the serum levels of GS.
 *Adapted from the International Cat Care Guidelines:
https://icatcare.org/resources/icatcare_fipupdate_july25.pdf
 
Subcutaneous (injection) dosages:
 
  • 6-7.5 mg/kg for wet and dry FIP  that does NOT have ocular or neurological involvement
  • 10 mg/kg for ocular FIP
  • 10 mg/kg (minimum) for neurological FIP
It is recommended to use regulated  GS-441524 by vet prescription whenever possible.
Note: Many of the black market vendors label their pills by what they estimate to be the bioavailable dose.
 
Please keep in contact with your veterinarian and treatment advisor for questions about your cat’s dosage and adjusting dose through treatment as your cat gains weight. Increasing dose with weight gain is very important for a successful outcome.
 

Access to FIP
Treatment

Canada Access to Treatment
International Access to Treatment

FIP Support & Guidance

Resources and support are available! All are welcome to join our support group and community! We provide FIP support across Canada and have connections with a global network for FIP cats outside of Canada.

FIP Advocates Support Group

Dosage Calculator: GS-441524 Oral liquid/Injections Only

Dosage Calculator

How To Use The Calculator

For calculating your kitty’s liquid or injection dosage you will need to enter their weight in kg or lbs, the dosage and medicine concentration into the calculator. You will then see at bottom of the calculator the dose you need to give your kitty.

Another way to calculate dosage is a simple formula:

Weight in kg x dosage / concentration = dose

*Please check with your vet and treatment advisor if you have any questions.

GS-441524 FAQs

Once you join the FIP Advocates and Champions group you will be connected with an  advisory team who will explain the treatment process and prescription options through your veterinarian. In Canada and many other countries, regulated treatment is available by veterinarian prescription from compounding pharmacies.

When FIP is the presumptive diagnosis or one of the differentials being considered, initiating a treatment trial with GS-441524 is highly recommended. GS has been proven to be a very safe antiviral, making it an effective and safe diagnostic tool. This approach can, in many cases, circumvent the need for more invasive and costly testing procedures (Taylor et al., 2025). 

Weighing 1-2 times a week is recommended and even more often if they are kittens. It is very important to adjust the dose regularly with weight gain to avoid risking regression or relapse.

Testimonials

Treatment Stories

Here are a few treatment stories from parents in our Facebook group sharing their experiences with their cats who have undergone FIP treatment, and come out on the other side.

FIP Survivors

This is Tiki. She’s in the observation phase and is doing great. She was diagnosed with Ocular FIP in December. The gals from this group were fantastic in answering questions and provided me with the help I needed to help Tiki recover! She was not an easy patient and it was very hard for her to take injections but we persevered and she’s living a full life with her kitty friends. I’m optimistic she will be graduating in a couple months 😀

Yesterday Oliver got his graduation cap! Six months ago he was diagnosed with dry FIP. With the help and support of the admin team, my boy will now see his 6th birthday this august 🥰🥰

I cannot believe it’s been 2 years since we first started treatment on Roxy and and Dan (yes I had the unfortunate news to have not one but two cats diagnosed with FIP different forms two months apart). With the help of Krista and the FIP community we are not almost two years cured. Roxy had relapsed briefly and completed 120 days and Dan completed 84 days. Not a single health incident since. My love, my gratitude is endless for all of you. Without your constant guidance and support I would have given up. 2 years 🥳🥳🥳🥳 of living their best life.