Its in phase 1 trials...still watching for safety and dosing ranges...long way to go.
Wonder why they havent reported trials with other protease inhibitors already being used for HIV? Or is this one they think they can market?
Protease inhibitors are targeted at a specific enzyme, C3L in this case. Pfizer actually started working on a C3L protease inhibitor back in 2003 to treat SARS, but SARS went away and they shelved the project. There are other studies into C3L inhibitors against coronaviruses. The 2 C3L PI drugs Pfizer is working on (1 IV and 1 pill) could potentially work against all coronaviruses.