Bebtelovimab

Bebtelovimab (LY-COV1404, LY-3853113) is a human monoclonal antibody approved for emergency use in the treatment of COVID-19. It binds to a portion of the SARS-CoV-2 spike (S) protein's receptor-binding domain, thereby preventing spike protein interaction with ACE2 and subsequent viral entry into host cells. Bebtelovimab is notable in that the epitope to which it binds appears infrequently mutated, making it a viable candidate for use in resistant SARS-CoV-2 strains (i.e. variants of concern, VOCs), including the B.1.617.2 (Delta) and B.1.1.529 (Omicron) variants. This is in contrast to previously developed COVID-19 monoclonal antibody treatments - including bamlanivimab, etesevimab, casirivimab, and imdevimab - which have been found ineffective in the treatment of COVID-19 caused by the Omicron variant.

Bebtelovimab was issued an emergency use authorization (EUA) by the FDA on February 11, 2022, for the treatment of mild-to-moderate COVID-19 in select patients. In November 2022, the FDA updated the Health Care Provider Fact Sheet for bebtelovimab to inform of its expected reduced activity against certain emerging Omicron subvariants of SARS-CoV-2. On November 30, 2022, the EUA for bebtelovimab was officially withdrawn due to a lack of efficacy against Omicron subvariants, therefore bebtelovimab is no longer authorized for emergency use in the US.