Study panning anti-malaria drug Trump took against Covid faces new questions

British medical journal the Lancet on Tuesday said it had concerns about data behind an influential article that found hydroxychloroquine increased the risk of death in Covid-19 patients, a conclusion that undercut scientific interest in the medicine championed by US President Donald Trump.

Hydroxychloroquine - which has anti-inflammatory and antiviral properties - inhibited the coronavirus in laboratory experiments but has not been proven effective in humans, particularly in placebo-controlled, randomized clinical trials considered the gold standard for data.