Covid: Pfizer says antiviral pill 89% effective in high-risk cases

https://www.bbc.com/news/health-59178291

The treatment consists of 30 pills given over five days. That includes 10 pills of ritonavir, an old H.I.V. drug, which helps Pfizer’s drug remain active in the body longer. (Merck’s treatment course is 40 pills over five days.)

https://www.google.com/amp/s/www.nytimes.com/2021/11/05/health/pfizer-covid-pill.amp.html