The use of hydroxychloroquine as a treatment for COVID-19 serves as an example of what is wrong with medical information being widely disseminated before it is thoroughly vetted by peer review. Preliminary studies of this treatment modality were spread widely, creating false hope that a treatment for COVID-19 existed. Several randomized trials have shown that hydroxychloroquine is not an effective therapy for COVID-19.

David Juurlink, MD, PhD, from the University of Toronto summarizes the evidence base regarding hydroxychloroquine and COVID-19.

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Pathophysiology, Transmission, Diagnosis, and Treatment of Coronavirus Disease 2019 (COVID-19)