U.S. regulators on Thursday approved the first drug to treat COVID-19: remdesivir, an antiviral medicine given to hospitalized patients through an IV. The drug, which California-based Gilead Sciences Inc. is calling Veklury, cut the time to recovery by five days — from 15 days to 10 on average — in a large study led by the U.S. National Institutes of Health. It had been authorized for use on an emergency basis since spring, and now becomes the first drug to win full FDA approval for treating COVID-19. President Donald Trump received it when he was sickened earlier this month.