ArticleJournal of the American Veterinary Medical Association2024
Unlicensed antiviral products used for the at-home treatment of feline infectious peritonitis contain GS-441524 at significantly different amounts than advertised.
Article in Journal of the American Veterinary Medical Association, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
21 citing papers in PubMed, 1 synthesis or guideline pooled it, 18 citations in OpenAlex.
- Efficacy of GS-441524 for Feline Infectious Peritonitis: A Systematic Review (2018-2024).Pathogens (Basel, Switzerland) · 2025Pooled it
- A Validated Eco-Friendly High-Performance Liquid Chromatography Assay for Therapeutic Drug Monitoring of GS-441524 in Cats with Feline Infectious Peritonitis.Pathogens (Basel, Switzerland) · 2026Article
- Clinical and imaging findings after antiviral treatment in cats with presumptive neurologic feline infectious peritonitis: 9 cases (2020-2024).Journal of veterinary internal medicine · 2026Article
- Development and Physicochemical Stability of an Oral GS-441524 Suspension for Weight-Adjusted Treatment of Feline Infectious Peritonitis.Veterinary medicine and science · 2026Article
- Multiplex fluorescent immunocytochemistry is a complementary test for the diagnosis of feline infectious peritonitis: a diagnostic clinical trial.Journal of feline medicine and surgery · 2026Article
- Epidemiological and Clinical Insights from 68 Veterinarian-Reported Cases of Feline Infectious Peritonitis During the Documented FIP Epizootic in Cyprus.Pathogens (Basel, Switzerland) · 2026Article
- Descriptive assessment of cardiac changes in cats with feline infectious peritonitis.Journal of veterinary internal medicine · 2026Article
- Update on Treatment of Feline Infectious Peritonitis: European Advisory Board on Cat Diseases (ABCD) Guidelines.Viruses · 2026Review
- Clinical Features and Outcomes of Treatment for Effusive Feline Infectious Peritonitis with GS-441524 in Seventeen Retrovirus-Positive Cats.Pathogens (Basel, Switzerland) · 2026Article
- Therapeutic Drug Monitoring of GS-441524 in Cats with Feline Infectious Peritonitis: Pharmacokinetic Variability and Implications for Dose Optimization.Pathogens (Basel, Switzerland) · 2026Article
- Article
- From Challenge to Cure: A Look at Feline Infectious Peritonitis and Emerging Treatment Strategies and Breakthroughs.Veterinary sciences · 2025Review
- Prospective Analysis of Clinicopathologic Correlates of At-Home Feline Infectious Peritonitis Treatment Using GS-441524.Pathogens (Basel, Switzerland) · 2025Article
- Evaluation of selected inflammatory markers in cats with feline infectious peritonitis before and after therapy.BMC veterinary research · 2025Article
- Rapid Clinical Resolution and Differential Diagnosis of a Neurological Case of Feline Infectious Peritonitis (FIP) Using GS-441524.Pathogens (Basel, Switzerland) · 2025Article
- Spectrum of care approach to animal shelter management of feline infectious peritonitis complicated by feline leukemia virus.Frontiers in veterinary science · 2025Article
- Article
- Owner experience and veterinary involvement with unlicensed GS-441524 treatment of feline infectious peritonitis: a prospective cohort study.Frontiers in veterinary science · 2024Article
- GS-441524 and molnupiravir are similarly effective for the treatment of cats with feline infectious peritonitis.Frontiers in veterinary science · 2024Article
- Treatment With Remdesivir Alone or in Combination With GS-441524 in Cats With Ocular Involvement of Feline Infectious Peritonitis: An Observational Case Series.Journal of veterinary internal medicineArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors at 4 institutions in 1 country.
Funding
Abstract
objectiveTo analyze the content of unlicensed GS-441524-like products being used as a largely successful at-home treatment for cats suspected to have FIP. The remdesivir content and pH were also measured. SAMPLE: 127 injectable and oral samples from 30 of the most popular brands of black market producers.
methodsUnlicensed GS-441524-like products were procured through donations and tested for GS-441524 and remdesivir content by liquid chromatography with tandem mass spectrometry. A pH meter measured the pH of injectable samples.
resultsOf the 87 injectable formulations, 95% contained more (on average 39% more) GS-441524 than expected based on the producer's marketed concentrations. The average pH (1.30 pH) was well below the physiologic pH conditions recommended for SC injections. The oral formulations were more variable, with 43% containing more GS-441524 (on average 75% more) than expected and 58% containing less (on average 39% less) than the expected content. There was minimal variability in GS-441524 content between replicate samples in the injectables formulations (measured by coefficient of variation). One injectable and 2 oral samples additionally contained remdesivir. CLINICAL RELEVANCE: All unlicensed products used for the at-home treatment of FIP that we tested contain GS-441524. The injectables generally contain significantly more drug than advertised at a below-physiologic pH. Unlicensed oral products vary more widely in drug content and suffer from unconventional dosing and labeling. These data should highlight the need for regulation of these products and the development of legal pathways to procure GS-441524.
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.