News Study finds hydroxychloroquine, the drug taken by Trump to ward of COVID-19, doesn’t prevent coronavirus infection June 3, 2020 Karen Weintraub and Elizabeth Weise, USA TODAY Comments Off on Study finds hydroxychloroquine, the drug taken by Trump to ward of COVID-19, doesn’t prevent coronavirus infection Hydroxychloroquine fails another test against COVID-19. It doesn't prevent serious infection, study found, though it does have annoying side effects.