Fair enough. Over the years I have worked with a number of physicians who ran clinical trials. They made sure that I understood that there is no such thing as risk free medicine. That said, a number of the newer drugs are pushed into the market with safety track records that are considerably more concerning than that of HCQ. We will not know definitively about the prophylactic efficacy of HCQ until controlled trials with placebo groups and deliberate exposure of subjects to COVID 19 are conducted. My guess is that those trials will never be conducted because of the lack of profit to the pharmaceutical industry. It is very hard to establish intellectual property rights to a generic drug.
They were doing prophylaxis studies among health care workers right now. That is probably the best we will get as no one would deliberately expose people to the disease