Here is a real randomized trial of HCQ:
A Randomized Trial of Hydroxychloroquine as Postexposure Prophylaxis for Covid-19 List of authors. David R. Boulware, M.D., M.P.H., Matthew F. Pullen, M.D., Ananta S. Bangdiwala, M.S., Katelyn A. Pastick, B.Sc., Sarah M. Lofgren, M.D., Elizabeth C. Okafor, B.Sc., Caleb P. Skipper, M.D., Alanna A. Nascene, B.A., Melanie R. Nicol, Pharm.D., Ph.D., Mahsa Abassi, D.O., M.P.H., Nicole W. Engen, M.S., Matthew P. Cheng, M.D., Derek LaBar, Pharm.D., Sylvain A. Lother, M.D., Lauren J. MacKenzie, M.D., M.P.H., Glen Drobot, M.D., Nicole Marten, R.N., Ryan Zarychanski, M.D., Lauren E. Kelly, Ph.D., Ilan S. Schwartz, M.D., Ph.D., Emily G. McDonald, M.D., Radha Rajasingham, M.D., Todd C. Lee, M.D., M.P.H., and Kathy H. Hullsiek, Ph.D.
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. (Funded by David Baszucki and Jan Ellison Baszucki and others; ClinicalTrials.gov number, NCT04308668. opens in new tab.)
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