Hydroxychloroquine Fails to <br />Prevent COVID-19, Study Finds Conducted by disease specialists at the <br />University of Minnesota, the results of <br />the study were published Wednesday in <br />the 'New England Journal of Medicine.' Hydroxychloroquine has been touted by <br />President Donald Trump as a possible<br />preventative measure against COVID-19. The study reveals that the malaria drug <br />is not significantly more effective <br />at preventing COVID-19 than a placebo. Dr. David Boulware, Lead Study Author, via CBS News Dr. David Boulware, Lead Study Author, via CBS News Federal regulators have expressed <br />concern about the health effects of <br />using hydroxychloroquine, especially <br />without a prescription. French officials stopped using the drug in hospitals <br />after the World Health Organization suspended its use.