GS-441524

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GS-441524 is a nucleoside analogue antiviral drug which was developed by Gilead Sciences. It is the main plasma metabolite of the antiviral prodrug remdesivir, and has a half-life of around 24 hours in human patients. Remdesivir and GS-441524 were both found to be effective in vitro against feline coronavirus strains responsible for feline infectious peritonitis (FIP), a lethal systemic disease affecting domestic cats. Remdesivir was never tested in cats (though some vets now offer it), but GS-441524 has been found to be effective treatment for FIP. It is widely used despite no official FDA approval due to Gilead's refusal to license this drug for veterinary use. In several countries oral GS-441524 tablets (and injectable remdesivir) became legally available to vets for the treatment of FIP in cats, for example Australia, the Netherlands, and the United Kingdom. Besides remdesivir, other prodrugs include obeldesivir (Gilead Sciences, Phase III) and deuremidevir (Vigonvita/Junshi, conditional approval in China).