China News Service, May 21, comprehensive report, WHO health emergency project leader Michael Ryan said on the 20th that hydroxychloroquine has not been found to be effective in the treatment or prevention of new coronary pneumonia. US President Trump, who previously claimed to take hydroxychloroquine, said on the same day that he would stop taking it in the next few days.

Data graph: US President Trump. China News Agency reporter Chen Meng Tongshe

  Ryan noted: "At this stage, neither hydroxychloroquine nor chloroquine have been found to be effective in treating or preventing new coronary pneumonia."

  He said that many authorities have issued warnings about the potential side effects of this drug. Some countries have restricted the drug to clinical trials or taking it under the supervision of a doctor in a hospital.

  The US Food and Drug Administration (FDA) issued a warning in April 2020 prohibiting the widespread use of hydroxychloroquine outside closely monitored hospitals or clinical trials. The report said that some patients who used hydroxychloroquine had "serious heart rhythm problems."

  On the 20th, Trump said that he would stop taking hydroxychloroquine in the next few days. "I want to complete the treatment within a day or two," Trump said at a meeting with the governors of Arkansas and Kansas.

  Trump revealed for the first time on the 18th that as a measure to prevent infection with the new coronavirus, he took hydroxychloroquine "every day" for about two weeks.