protease inhibitors

Pfizer's Paxlovid looks very promising in fighting COVID. It also provides a good opportunity to learn about how enzyme inhibitors work. For masochists only.
Antiviral drug development for COVID-19 took a back seat to vaccines during the brief time – when we thought that ending the pandemic was simply a matter of getting enough needles in enough arms. But the virus had other ideas: variants. Now it's looking like we may need a drug to complement the vaccines. Three are in development. Here's a look at Pfizer's PF-07321332. It should work, but don't hold me to that.