Medical reports were coming out saying treatment with the drug was showing promising results. Lab tests do show the drug does indeed have an effect on blocking the virus from infecting cells. Trump comes out and says there's reason to be hopeful and we should be looking into this. Democrats and mass media immediately denounce Trump's statement and in some cases threaten doctors who prescribe or even speak out in favor of the drug. Some studies come out that say it does appear to lower the death rate. Other studies come out saying no measurable effect. More studies come out pointing out flaws in the previous studies that render those conclusions uncertain, which lead to at least one of those previous studies saying no being retracted. Many patients on the drug still continued showing positive results. Questions begin to arise regarding the political and financial motivations of some of those speaking out against the drug. Another study comes out that says yes it does work under certain conditions. Democrats, the WHO and media continue making blanket proclamations that the drug is universally bad with regards to Covid.
That is the flow of public information on the drug. Note the timing of their denunciation of the drug. Not when a study shows up that says no, but when Trump says we should look into these positive reports. They couldn't stand the idea of Trump giving people any kind of hope.