FILE PHOTO: A person walks past a Pfizer logo in New York City
The company and its rivals, including U.S.-based Merck & Co Inc and Swiss pharmaceutical Roche Holding AG, have been racing to develop the first antiviral pill to be taken on early signs of the illness. PF-07321332 is designed to block the activity of a key enzyme that is needed for the coronavirus to replicate.
Merck and partner Ridgeback Biotherapeutics' molnupiravir is already being studied in a late-stage trial in non-hospitalized patients to see if it reduces the risk of hospitalization or death.