[1] https://en.wikipedia.org/wiki/Dexamethasone
[2] https://en.wikipedia.org/wiki/RECOVERY_Trial
[3] "A cheap and widely available drug can help save the lives[...]" https://www.bbc.co.uk/news/health-53061281
That's at least my understanding based on the proposed systemic problem in FDAs.
Conversely, in this proposed problem, it's said that ivermectin (and others) are only effective when used in the early stage or even prophylactic. Being already fully licensed medications, that could put the issuance of an EUA for vaccines or Remdesivir in jeopardy.
Remdesevir is fully approved in the US.
What's the explanation for why dexamethasone was allowed but ivermectin is being suppressed?
During that time gather data for this use was begun and it's taken this long to gather enough, over enough time, to prove its efficacy according to the standards required.
Dozens of (mostly Phase 2 and 2/3 combined) ivermectin trials as a Covid therapeutic are ongoing, no one has stamped them out.