HCQ - we have a double blind randomized study among many others showing its ineffective.
Can you link to these studies? I looked over this study, and as a layman, i dont see proof of anything except that Covid-19 is not (so) dangerous to the age group tested, and that the virus is not so catchy (?!)
https://www.nejm.org/doi/full/10.1056/NEJMoa2016638A quick (approximate)summary is that they got 800 people (median age=40, half men, half women) who were in close contact with Covid-19 cases. 400 got HCL, 400 placeba. From each group 50 got sick, and there was 1 hospitalization in each group. No deaths in either group.
And i think that the HCQ promoters agree 100% to the study's stated conclusion. They dont say that it will prevent illness, they just say it will prevent deaths.
"CONCLUSIONS
After high-risk or moderate-risk exposure to Covid-19, hydroxychloroquine did not prevent illness compatible with Covid-19 or confirmed infection when used as postexposure prophylaxis within 4 days after exposure."