U.S. health authorities and researchers are investigating why some people who appeared to recover from Covid-19 after taking Pfizer Inc.’s antiviral pill developed symptoms again soon after.
Paxlovid is supposed to treat the newly infected, keeping them out of the hospital. Within two weeks of appearing to get better, however, some users experienced cold-like symptoms such as sore throat and cough, according to physicians and published case reports.
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This post first appeared on wsj.com
