evidence: "Nationally, we put a great emphasis on one drug, hydroxychloroquine," said David Holtgrave, the dean of the School of Public Health at the University at Albany, who co-authored a study of the drug as a treatment for coronavirus. "I worry that history will judge this as having over-invested in one treatment pathway as opposed to looking more broadly at a larger number of treatment candidates." [...] Hydroxychloroquine has been used for many years to treat diseases such as malaria, rheumatoid arthritis, lupus. After President Trump started touting hydroxychloroquine as a treatment for Covid-19, patients with those illnesses reported having trouble finding the drug. [...] Last month, FDA Commissioner Dr. Stephen Hahn wrote that his agency’s decision to authorize hydroxychloroquine in March "was based on evaluation of the EUA criteria and the scientific evidence available at that time."