Dont you just love this American President?

Trump has announced he has been taking Hydroxychloroquine for 10 days now. It wasnt recommended. He asked for it because "He had heard a lot of good things about it" I wonder if anyone explained the different between a drug that suppresses the symptoms and one that prevents you gettting the actual disease.
https://www.abc.net.au/news/2020-05-19/coronavirus-australia-live-news-covid-19-latest/12261174