Trump, noting that he has tested negative for the virus and shows no symptoms, said he'd been taking the drug "for about a week and a half."
"I take a pill every day," he said on Monday, adding that he also takes zinc as a preventative measure.
Asked why, he said "because I think it's good. I've heard a lot of good stories."
Trump has often played down the dangers of coronavirus, including last week when he said it threatened only a small number of people. He has also pointedly refused to wear a mask, despite federal recommendations and the fact that most of his staff have taken to covering their faces in public.