The drug made infamous and promoted by President Trump will be used in a clinical trial on British health workers, it has been reported.
The trial is the first worldwide study to see whether chloroquine or hydroxychloroquine can prevent the actual infection of Covid-19.
Thousands of health workers including doctors and nurses have died across the planet after being infected by patients with the virus.
It is part of an investigation led by the Bangkok-based Mahidol Oxford Tropical Medicine Research Unit (MORU), supported by the University of Oxford and health charity Wellcome.
There are 25 planned sites to test the drug with Oxford University Hospital and the Royal Sussex County Hospital in Brighton being the pioneers.
The principal investigator Professor Sir Nicholas White said. “We really do not know if chloroquine or hydroxychloroquine are beneficial or harmful against COVID-19,” he said, adding that the trial was the best way to find out.
It comes just days after President Trump told reporters that he had been taking the anti-malarial drug to ward off the virus, even though it is unproven.