Hydroxychloroquine: How did an unproven drug become Trump's 'miracle cure'?

The drug has been used to treat a number of diseases in the past half-century but after a French study claimed it was effective against coronavirus it has been hailed by the US president as a cure. But there is scant evidence it is effective – and it could actually be harmful. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>