FDA OKs antibody to protect against RSV in infants

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The FDA has approved Merck’s Enflonsia, a monoclonal antibody designed to prevent respiratory syncytial virus lower respiratory tract disease in newborns and infants. 

The approval is based on data from a phase 2b/3 trial, which showed a 60.5% reduction in RSV-associated medically attended lower respiratory infections compared to placebo, according to a June 9 news release from the drugmaker. 

The treatment also reduced RSV-associated hospitalizations by 84.3%. Enflonsia is administered as a single 105 mg dose, regardless of infant weight, and is designed to provide protection through a typical five-month RSV season. 

The CDC’s Advisory Committee on Immunization Practices is expected to review use recommendations later this month, with distribution expected to begin before the 2025-2026 RSV season. 

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