A similar decision was made for HIV combination drug lopinavir/ritonavir which produced a similar lack of results. President Trump has repeatedly praised hydroxychloroquine and in May claimed he was personally taking the drug.
In a statement about its trials the WHO said: “These interim trial results show that hydroxychloroquine and lopinavir/ritonavir produce little or no reduction in the mortality of hospitalised COVID-19 patients when compared to standard of care.
“Solidarity trial investigators will interrupt the trials with immediate effect.”
However the WHO said studies of the drugs could continue to assess their impact on non-hospitalised patients.
In late May Trump informed reporters at the White House that he’d been taking hydroxychloroquine for “a couple of weeks”.
Federal regulators in the US have warned the drug can have serious, and potentially even deadly, side effects.
The President first endorsed the anti-malaria drug back on April 5 when he said: “It’s a very strong, powerful medicine but it doesn’t kill people.
“We have some very good results and some very good tests.
“What really do we have to lose?”
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Speaking to CNN she said: “He’s our president and I would rather he not be taking something that has not been approved by the scientists, especially in his age group and his, shall we say, weight group – morbidly obese.”
At Trump’s last full check-up, in February 2019, he had a body mass index of 30.4 making him obese by US standards.
Kayleigh McEnany, the White House press secretary, confirmed to CBS News Trump had been taking hydroxychloroquine.
She asserted: “I can absolutely confirm that.
“The president said himself he’s taking it. That’s a given fact. He said it. The president should be taken at his word.”
On Friday the WHO reported over 200,000 new coronavirus cases, the first time that milestone has been hit over a 24 hour period.
Of the 212,326 cases reported worldwide 53,213 of them were recorded in the United States.
On Friday it was reported that Kimberly Guilfoyle, girlfriend of Donald Trump Jr, had tested positive for COVID-19.
Neither Ms Guilfoyle nor Mr Trump Jr are believed to have spent time with the president over the past few days.
The European Union approved antiviral drug remdesivir for COVID-19 treatment on Friday, following Britain’s NHS, after studies indicate it can cut coronavirus hospital recovery times.