TOKYO—drugmaker Shionogi & Co. said it plans to seek approval this month to sell its Covid-19 treatment pill in Japan after the company found that in human trials the pill had strong virus-fighting ability compared with Pfizer Inc.’s Paxlovid.
Shionogi acknowledged that studies of its drug are much smaller than Pfizer’s and have yet to prove effectiveness in preventing serious Covid-19 cases. Pfizer said its final-stage trial, which included more than 2,000 patients, showed Paxlovid cut the risk of hospitalization or death by 89% if patients took the pill within three days of diagnosis.
