Thanks for the link...it looks like HCQ was also dropped from the recommended list.
There’s been attempts in other countries to use HCQ, Ivermectin and the rest as prophylactics, giving them to health care workers. The studies are reported at PMC where the original, encouraging, 2005 SARS HCQ paper can also be found.
The results I read were mixed in India but apparently not good enough to warrant using them. In Vietnam they didn’t see any benefit, HCWs caught Covid at the same rate whether they took the prophylactics or not. Africa has tried this stuff as well.