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GS-441524 50mg/1ml Oral Suspension - PetScript Pharmacy
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Metronidazole Benzoate Oral Suspension - PetScript Pharmacy
Metronidazole Benzoate Oral Suspension

$24.83

Doxycycline Hyclate Split Tablet ( Chicken Flavored ) - PetScript Pharmacy
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$1.00

Gabapentin Oral Suspension - PetScript Pharmacy
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$41.88

Doxycycline Hyclate Oral Suspension - PetScript Pharmacy
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$25.87

Metronidazole Benzoate Bisect Tablet - PetScript Pharmacy
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$0.70

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$16.99

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Metronidazole Benzoate Oral Suspension

$24.83

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Doxycycline Hyclate Split Tablet ( Chicken Flavored )

$1.00

Gabapentin Oral Suspension - PetScript Pharmacy
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$41.88

Doxycycline Hyclate Oral Suspension - PetScript Pharmacy
Doxycycline Hyclate Oral Suspension

$25.87

Metronidazole Benzoate Bisect Tablet - PetScript Pharmacy
Metronidazole Bisect Tablet

$0.70

Enrofloxacin in Oil Oral Suspension - PetScript Pharmacy
Enrofloxacin in Oil Oral Suspension

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Best F.I.P Treatments for Cats | GS-441524 & Molnupiravir Options

Best F.I.P Treatments for Cats | GS-441524 & Molnupiravir Options

Find top F.I.P. treatments, helpful FAQs, and our latest blog update—all in one place.

Affordable FIP treatments for cats. PetScript Pharmacy options include GS-441524 and Molnupiravir. Trusted antiviral meds for feline infectious peritonitis ( F.I.P.) Fast shipping. Proven results.

Affordable F.I.P. Treatments

GS-441524 50mg/1ml Oral Suspension
GS-441524 50mg/1ml Oral Suspension - PetScript Pharmacy

GS-441524 50mg/1ml Oral Suspension

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From $82.00
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Molnupiravir Capsule
Acepromazine Maleate Capsule - PetScript Pharmacy

Molnupiravir Capsule

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From $107.54
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Molnupiravir Oral Oil Suspension
Molnupiravir Oral Oil Suspension - PetScript Pharmacy

Molnupiravir Oral Oil Suspension

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From $78.75
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Read More About F.I.P Treatments

Affordable FIP Solutions
Affordable FIP Solutions
April 8, 2025
Jonathan Padgett

Affordable FIP Solutions

Comprehensive FIP Treatment Options at PetScript Pharmacy

At PetScript, we understand the urgency and emotional weight behind an FIP diagnosis. That’s why we proudly offer two leading treatment options—Molnupiravir and GS-441524—to give veterinarians and pet parents flexible solutions tailored to each case.

Now Offering Two Forms of Molnupiravir:


Custom flavors designed to improve palatability and ease of dosing.


Accurately dosed, available in multiple strengths to support individualized therapy.

How Molnupiravir Works:

According to independent studies of generic forms, molnupiravir targets viral replication, helping to control the spread of the FIP virus and reduce clinical symptoms.*

GS-441524: The Foundation of FIP Therapy

GS-441524 remains a widely used and well-regarded first-line antiviral for treating FIP. It's especially effective in early or straightforward cases and is often used in 12-week protocols.

When to Use Each:


is often selected as a rescue therapy when GS-441524 isn’t sufficient or symptoms return.


continues to be the go-to first-line treatment for many cases of FIP.

Flexible Dosing for Every Case:

Dosage ranges from 10mg/kg to 20mg/kg twice daily, adjusted based on the type of FIP—wet, dry, ocular, or neurological—and the cat’s weight.

Mild Side Effects, Proven Tolerability:

Studies have shown minimal adverse effects with either treatment, making them suitable for long-term use under veterinary supervision.

Storage & Beyond-Use Dating:


Up to 90 days


Up to 180 days

Shop Popular FIP Treatments

Got Questions About F.I.P.? We’ve Got Answers

F.I.P. Explained: Common Questions

What is GS-441524 and how does it work in treating FIP?


GS-441524 is an antiviral compound that targets and inhibits the replication of the feline coronavirus responsible for FIP. It works by interfering with the virus's RNA synthesis, ultimately helping to reduce the viral load in affected cats. It has shown high success rates, particularly for non-neurological cases.

Is Molnupiravir a safe alternative to GS-441524 for FIP treatment?

Molnupiravir is an antiviral initially developed for human use, which has shown promise as an off-label treatment for FIP in cats. While research is still ongoing, anecdotal and emerging clinical evidence supports its effectiveness, especially for neurological and ocular FIP cases. However, it's important to use it under veterinary guidance.

How long does a typical treatment with GS-441524 or Molnupiravir last?

Treatment typically lasts around 84 days (12 weeks) for both medications, though the exact duration can vary based on the cat’s response, the severity of the disease, and whether neurological symptoms are present. Bloodwork and clinical signs are monitored throughout to assess progress.

What are the side effects of using GS-441524 or Molnupiravir in cats?

GS-441524 is generally well-tolerated but may cause pain or swelling at injection sites. Molnupiravir, taken orally, may lead to mild gastrointestinal upset in some cats. In rare cases, more serious side effects have been reported, so regular vet monitoring is essential.

Can GS-441524 or Molnupiravir fully cure FIP, and what’s the success rate?

Yes, many cats treated with GS-441524 or Molnupiravir have gone into full remission, especially when treatment starts early. Success rates for GS-441524 exceed 80%, and while Molnupiravir data is more limited, it has shown comparable outcomes in appropriate cases.

Are GS-441524 and Molnupiravir prescription medications?

Yes - your Veterinarian may order from us directly, or they can write you a prescription for GS-441524 and / or Molnupiravir.

Can GS-441524 and Molnupiravir be used together?

It is generally not recommended to use both simultaneously unless specifically advised by a veterinarian with experience in FIP treatment. These antivirals work through different mechanisms, and combining them could lead to unknown interactions or reduced effectiveness. Sequential use may be considered in certain complex cases under vet supervision.

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This content is intended for counseling purposes only. This content is informational/educational and is not intended to treat or diagnose any disease or patient. No claims are made as to the safety or efficacy of mentioned preparations. The compounded medications featured in this content have been prescribed and/or administered by prescribers who work with ProLab Pharmacy. You are encouraged to speak with your prescriber as to the appropriate use of any medication. ProLab Pharmacy’s compounded veterinary preparations are not intended for use in food and food-producing animals. All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them..