The World Health Organization (WHO) said testing of the malaria drug hydroxychloroquine as a possible treatment for coronavirus has been halted because of safety fears.
Trials in several countries are being temporarily suspended as a precaution.
It comes after a recent medical study suggested the drug could increase the risk of patients dying from COVID-19.
United States President Donald Trump has promoted the anti-malarial drug, despite warnings from public health officials that it could cause heart problems in COVID-19 patients.
Trump also said he was taking the drug himself to ward off the virus, but said in Sunday he was not taking it any more.
