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What‘s the Correct Dosage to Treat My Cat's FIP

Updated: Jan 20, 2022

There are 4 factors that have the greatest impact your cat's feline infectious peritonitis (FIP) treatment success rate.

  1. Choose GS-441524, an antiviral medicine, to treat your cat's FIP infection.

  2. Treat other ailments while your cat is being treated for FIP

  3. Treat FIP as soon as it is diagnosed. Delays cause avoidable death.

  4. Use sufficient dosage. Correct dosages can be the difference between life and death, between relapse and no relapse.

We have written extensively on GS-441524 and its effectiveness treating FIP in cats. (You may read those articles here.) GS is currently the only clinically proven treatment against the FIP virus. You cat may experience a number of physical aliments as result of the FIP infection. Treat these complications along with FIP for a more complete recovery.

Here is the BAD news. A timely FIP diagnoses is often out of our control. The non-effusive DRY form of FIP is particularly difficult to diagnose during the early stages of infection. Veterinarians have to complete numerous extensive and expensive tests to narrow the possibilities down to a FIP infection, something most vets and cat owners are reluctant to do when the cat still looks relatively healthy. No definitive FIP tests are available today. All too often cats with FIP are correctly diagnosed during the final stages of the infection. At, we are working to create an affordable and definitive test for future generations of veterinarians.

Here is the GOOD news. While there is little we can do to improve the timeliness of an accurate FIP diagnose, there is a lot we can do to increase the success rate of FIP treatments by adhering to the recommended dosage below. Our dosage table was created after analysing treatment results from almost 1000 cats, and exchanging treatment observations with veterinarians across 4 continents.

Wet FIP: 6mg/kg of body weight

Dry FIP: 8mg/kg of body weight

Ocular FIP: 10mg/kg of body weight

Neurological FIP: 10mg/kg of body weight

Use our dosage calculator to determine the exact amount of GS to be given for your cat's FIP treatment.

The gravity of FIP infection increases as you go down the table. When sufficient dosage is given daily, FIP viral replication slows and eventually stops. Your cat's immune system will begin to recover. You will see obvious signs of healing within 3-5 days, such as relaxed breathing, increased appetite and physical activities, more responsive to owners voices and touches, clearing up of cloudy eyes. Here are videos of cats that have successful recovered from feline infectious peritonitis (FIP) using our FIP treatment.

It is important to note that every cat responds differently to GS treatments. Our table represents the lowest recommended dosages for each type of FIP infection. Greater dosage should be given when your cat's response to the treatment is not obvious or if your cat experiences a regression during the GS treatment, or a relapse shortly after the GS treatment has completed.

Of the cats that have succumbed to FIP, experienced regressions during the GS treatment, or a relapse after the completion of GS treatment, the common consensus amongst doctors was that either the treatment started too late, whereby the cats died within 2-3 days after starting the treatment; or insufficient daily dosage of GS-441524 was given to the cat. In the latter case, we observed that cats would initially exhibit improving physical conditions. But suddenly, they would suffer a regression in physical symptoms. The improvements only restarted when a higher dosage was given.

As always, contact us if you have questions regarding your cat's FIP treatment. Our experts will happily share their knowledge and experience with you.

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