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INJECTIONS vs PILLS: Which is better for my cat's FIP treatment?

Updated: Mar 13, 2023

If you're considering FIP treatment using GS-441524 antiviral, you have two options to choose from: subcutaneous injections or oral capsules/pills. But how do you decide which one is best for your cat? In this article, we'll discuss the advantages and disadvantages of each treatment option, as well as provide guidance on how to choose the most suitable one for your cat's FIP treatment.

The oral form of GS-441524 is typically available in the form of pills, which are given to cats orally. With the availability of more treatment options for cat owners, selecting the appropriate treatment for your cat has become easier. This article will explore the differences between these two forms of GS-441524 and provide guidance on how to choose the most suitable one for your cat's FIP treatment.

Injection Treatment

Let's begin by discussing the liquid injection form of GS-441524. This type of treatment is ready-to-use, but it's important to note that not all liquid GS-441524 products are of equal quality. The production process and quality of chemicals used can greatly affect the effectiveness of the treatment. Additionally, there can be a significant price variation between different brands, which can make it difficult to choose the right one.

Let's discuss the injection form of GS-441524, which is the most effective method of administering the antiviral treatment. There are various concentrations of GS-441524 injections available on the market, such as 15mg, 17mg, and 20mg, but offers a 30mg concentration suitable for larger cats weighing over 4kg or 9lbs. The injection method delivers the medication directly into your cat's bloodstream, ensuring immediate antiviral treatment. Moreover, injections enable veterinarians to administer an accurate dosage based on your cat's symptoms and weight. Visible improvements can be observed within 1 to 4 days of treatment, making injections the reliable method for severe FIP cases. We recommend starting FIP treatment with injections and continuing them until your cat's condition has stabilized and they are eating and defecating normally before switching to oral treatment. For the correct dosage of GS-441524 for your cat via injection, refer to our previous blog, "What's the Correct Dosage to Treat My Cat's FIP," or use our dosage calculator. Injections must be given daily, and some cats may resist after a few days. Check out our video for tips on how to administer injections without struggling. Now, let's move on to the topic of oral treatment.

Oral Treatment

Compared to injections, administering FIP treatment orally is faster and more convenient for cat owners. Oral treatment is available in the form of capsules or tablets, which can be given at home, eliminating the need for daily trips to the clinic and the expense of injections. Cats typically find it easier to consume capsules due to their smooth texture and lack of taste. However, it is important to note that oral treatment should only be used during the later phase of treatment, once your cat is out of the danger zone and no longer experiencing intermittent fevers, and is eating and defecating normally.

The effect of oral treatment is generally slower than injections, as GS441524 needs to go through the entire digestive system before entering the bloodstream. Furthermore, the amount of GS441524 absorbed by a cat's digestive system cannot be accurately controlled. Depending on your cat's overall health and the condition of its digestive organs, your cat may only absorb a fraction of the antiviral drug contained in the oral capsules or tablets. Cats with weakened digestive organs, such as those with feline infectious peritonitis (FIP), may experience a decreased absorption rate. Oral treatment is considered a riskier option than injections, and we advise it only after a 30-day injection treatment period or when your cat's condition has stabilized.

A Comparison between Injection & Oral Treatment Let’s have a look at the table below to explore the differences of both injection and oral treatments.

Type of Treatment





capsules / tablets


Subcutaneous Injection

Oral consumption​


  • Rapid and precise delivery of antiviral drug

  • Faster symptomatic improvements

  • Longer product shelf life​

  • Easy to administer

  • Cat experience no pain

  • Cheaper to administer, no need for medical professionals​


  • Need to learn subcutaneous injection method or bring cat to hospital for daily injections

  • Injection liquid is acidic and can be painful for some, but not all cats

  • Cats may develop skin irritation after repeated injections

  • Treatment cost is slightly higher compared to injections

  • Imprecise dosage

  • Slower symptomatic improvements

  • Not suitable for severe FIP infections



Slightly more expensive

Which Method Should I Choose For My Cat?

When it comes to FIP treatment, our recommendation is to start with injections as they are the most effective method of delivering GS-441524 and can provide immediate antiviral treatment to your cat's bloodstream via subcutaneous injections. However, if your cat experiences acute pain or develops severe skin irritations from repeated injections, you may consider switching to oral capsules once their condition stabilizes. Generally, it is safe to switch to oral treatment after 30 days of injection treatment. This ensures a sufficient amount of GS-441524 is provided throughout the course of FIP treatment and lowers the probability of reinfection in the future. If you need assistance deciding which treatment is right for your cat, our experts are available to share their knowledge with you. Please don't hesitate to contact us.

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תגובה אחת

22 בנוב׳ 2023

When it comes to treating Feline Infectious Peritonitis (FIP) in cats, the decision between injections and pills largely depends on the specific circumstances and health condition of your cat, as well as the type of medication prescribed. Injections, often considered more effective for certain types of FIP, can ensure a consistent dose is delivered directly into the bloodstream, but they require more frequent vet visits and can be stressful for some cats. Pills, on the other hand, offer the convenience of at-home administration but might pose challenges if your cat is resistant to oral medication. . online pharmacy service can be a helpful resource, providing access to prescribed FIP medications, whether injectable or oral, often at a lower cost and…

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