A cheap antidepressant reduced the need for hospitalization among high-risk adults with COVID-19 in a study hunting for existing drugs that could be repurposed to treat coronavirus. Researchers tested the pill used for depression and obsessive-compulsive disorder because it was known to reduce inflammation and looked promising in smaller studies. They've shared the results with the U.S. National Institutes of Health, which publishes treatment guidelines, and they hope for a World Health Organization recommendation. The pill, called fluvoxamine, would cost $4 for a course of COVID-19 treatment. By comparison, antibody IV treatments cost about $2,000 and Merck's experimental antiviral pill...