Pfizer starts testing COVID prevention pill
The company and its rivals, such as US-based Merck and Swiss Roche, have been racing to develop the first antiviral pill for Covid-19.
Pfizer said it would study the drug, PF-07321332, in up to 2,660 healthy adult participants aged 18 and older who live in the same household as an individual with a confirmed symptomatic Covid-19 infection. The trial would test the pill with a low dose of ritonavir, an older medication widely used in combination treatments for HIV infection. ■