"I think there are real dangers", he said, "for the president to play scientist and doctor on TV".
The Duke Clinical Research Institute is leading a study to, in part, determine if hydroxychloroquine can successfully prevent coronavirus infections in health care workers with a high risk of infection.
Recently, Trump said he has been taking the drug.
Data concluded that more than 27 percent of patients treated with hydroxychloroquine died and 22 percent of patients treated with the combination therapy died, whereas patients not treated with drugs had an 11.4 percent death rate. "The front-line workers, many, many are taking it", Trump said on Monday.
"I would never begrudge any American taking the advice of their physician", he added.
"We really do not know if chloroquine or hydroxychloroquine are beneficial or harmful against Covid-19".
The Food and Drug Administration has issued a warning against the use of the drug outside a clinical setting.
This request comes after the USA president Donald Trump continually promoted it at press conferences.
"I think it gives you an additional level of safety", Mr Trump said Tuesday, disregarding warnings that the drug can cause heart problems and dismissing studies that showed it had little benefit for coronavirus patients.
"Columbia's an institution that's very liberal", Trump told reporters Thursday. I'm not going to get hurt by it.
Kim told the news outlet that she was in the hospital for seven days where she received oxygen and plasma before she was released to go home. Anecdotally, President Trump has tested negative for the virus despite reported exposure.
The participants of the trial would have to be healthcare workers who are in contact with COVID-19 patients, provided they have not been diagnosed with the disease themselves. I happen to be taking it, hydroxychloroquine, right now. "At some point, I'll stop".
Hydroxychloroquine has become quite popular since US President Trump called it a "game-changer" in the fight against COVID-19.
Hydroxychloroquine is an antimalarial drug that's also used for treating autoimmune diseases like rheumatoid arthritis or lupus. However, in two recent large observational studies, patients were not found to benefit from the drug. A French study in April showed no benefits and a study at USA veterans hospitals even reported a higher death rate from those taking the drug.
"A lot of good things have come out about the hydroxychloroquine".