Abstract
Fostemsavir is a recently Food and Drug Administration-approved HIV-1 attachment inhibitor that binds to HIV-1 gp120 and prevents viral attachment to the cellular CD4 receptor. Here, we review the pharmacology, efficacy, tolerability, and resistance profile of fostemsavir. Fostemsavir is well tolerated and maintains virologic activity in individuals harboring multidrug-resistant HIV-1. In conjunction with optimal background therapy, a majority of heavily treatment-experienced clinical trial participants treated with fostemsavir achieved virologic suppression. The approval of fostemsavir represents an important advance for individuals harboring multidrug resistant HIV-1 due to its novel mechanism of action and lack of cross-resistance to other antiretrovirals. Further study will better define the role of resistance testing for fostemsavir and fostemsavir's potential role outside of salvage therapy in heavily treatment-experienced individuals.
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