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Injections vs. Oral: Which is better for my cat’s FIP treatment

Updated: Nov 15, 2023

When choosing FIP treatment using GS-441524 antivirus, you will have 2 options: subcutaneous injection or oral capsules or tablets. So how do you choose which one is right for your cat? In this article we will discuss the pros and cons of each treatment option, as well as when and how to choose the right option for your cat’s FIP treatment. For oral treatment, it is usually available in pill type. This type of GS is given orally. As there are more types of treatment options available to cat owners, cat owners can now choose the type of treatment for their cats with ease. In this article, we will discuss the differences between these 2 forms of GS-441524, and how to choose the right one for your cat’s FIP treatment.

Injection Treatment First of all, let’s discuss about GS-441524 in liquid injection form. Not all GS-441524 fluids are created equal. Its quality is highly dependent on the production process by the manufacturer and the quality of the chemicals used. To add to the confusion, you will also find that the prices are very different from one brand to another.

There are various types of concentrations for the GS441524 injection form. The most common concentrations available on the market today are 15mg, 17mg and 20mg. BasmiFIP™ is one of the only brands to offer a 30mg concentration that allows for a more comfortable injection experience for larger cats weighing over 5kg.

Injection treatment is the most effective method of performing GS-441524 treatment. The injection allows GS-441524 immediately into your cat’s bloodstream via subcutaneous injection. Injections also allow medical professionals to give the right dose based on your cat’s symptoms and weight. Cats treated with injections often show a visible improvement within just 1-4 days. Therefore, injections are a proper and reliable method of treatment of feline peritonitis for cats suffering from life -threatening conditions.

We recommend starting each FIP treatment with an injection. Continue the injection until your cat’s condition is stable and begins to eat, defecate normally before considering switching to oral treatment. To find out more about the appropriate dose for your cat using the injection method, you can use our calculator to determine the exact amount of GS441524 to be given. Injections need to be done daily and after a few weeks of treatment, some cats will start to fight back to avoid the injections. That is when it is time to consider switching to the oral treatment.

Oral Treatment Oral treatment is a quicker and easier method of performing FIP treatment than injection. Cat owners can do oral treatments at home, saving on daily trips to the clinic, and the cost of injections. Oral treatment is available in the form of capsules or tablets. Generally cats find it easier to take capsules than tablets because of the delicate texture of the capsules and less flavor. We recommend using oral capsules or tablets during the last phase of treatment, when your cat is outside the danger zone, that is, eating and defecating normally, and no longer has a fever.

Now let’s discuss the shortcomings of oral treatment. The first major problem is that oral treatment acts more slowly than injections. This is because the GS441524 antiviral drug in oral form must travel throughout the digestive system before being delivered into the bloodstream. The second major shortcoming of oral treatment is that we cannot control the dose as accurately as injections. Why? because each cat absorb the GS-441524 differently. Depending on your cat’s overall health and the condition of its digestive organs, your cat may only absorb some of the antiviral medication released by the oral capsule. Cats suffering from feline infectious peritonitis (FIP) often weaken the digestive organs including the stomach, kidneys and liver which will affect the rate of GS absorption.

Oral capsules and tablets are a more risky treatment option compared to injections. We recommend oral treatment only after 30 days of injection treatment or after your cat’s condition is stable. Comparison between Injections & Oral Treatment

Let’s look at the table below to see the differences between injectable and oral treatments.

Method of Treatment







Subcutaneous Injections

Taken Orally


  • ​Easy control of dosages.

  • Fast absorption.

  • Faster symptomatic improvements.

  • Longer product shelf life.

  • ​Easier to administer to cats.

  • Do not require. medical professional

  • Painless to cats.


  • Painful to some cats.

  • May need to learn how to perform injection.

  • Cat may struggle during injection.

  • Some cats develop skin irritation.

  • ​Less accurate dosage.

  • Slower symptomatic improvements.

  • Not suitable for severe cases or late stage infection.



Slightly more expensive

Which Method Should I Choose For My Cat? We recommend starting each FIP treatment with an injection. If your cat is having too many problems or experiencing severe skin irritation as a result of repeated injections, you may want to consider switching to oral capsules. Generally, it is safe to switch to oral treatment after 30 days of injection treatment. This is the most appropriate method to ensure an adequate amount of GS-441524 for the treatment of FIP and lower infection reduction in the future.

Contact us if you need help determining the right treatment for your cat. Our experts will be happy to share their knowledge with you.

Published by: Basmi FIP™ Thailand

Instagram: #basmifipth

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