The same issue seems to be true of a combo of lopinavir and ritonavir, says China
theguardian.com/world/2020/mar…
But if this DOES work it seems to me that one change in strategy is that more early stage treatment is necessary
So Hazmat suits/PPE gear to protect NHS staff
Much more early testing
Early treatment
Then antibody tests (as soon as developed) of a large enough group to see if getting infected with and without treatment results in increased immunity.