Fascinating review of virtually every study that's been done on Ivermectin
https://astralcodexten.substack.com/p/ivermectin-much-more-than-you-wantedOne interesting hypothesis discussed is that many of the studies showing its efficacy were done in 3rd world countries where the parasites it's made to target would otherwise be comorbidities for Covid, so in those countries it may have helped, not by beating Covid, but by beating the parasites that would otherwise make Covid more deadly. If true, it would be useless in 1st world countries where (hopefully) people don't have those parasites to begin with.
Beyond that, I'll leave the TL:DR to
@biobook to hopefully enlighten us with further insights and analysis.