News Pfizer antiviral drug could nearly end deaths from COVID-19, company study suggests November 5, 2021November 5, 2021Karen Weintraub, USA TODAYComments Off on Pfizer antiviral drug could nearly end deaths from COVID-19, company study suggests When given within 5 days of the onset of symptoms, Pfizer's antiviral therapy, Paxlovid, prevented nearly 90% of deaths from COVID, a new study finds.