"Database of all HCQ COVID-19 studies. 302 studies, 222 peer reviewed, 252 comparing treatment and control groups. Submit updates/corrections below. HCQ is not effective when used very late with high dosages over a long period (RECOVERY/SOLIDARITY), effectiveness improves with earlier usage and improved dosing. Early treatment consistently shows positive effects. Negative evaluations typically ignore treatment time, often focusing on a subset of late stage studies. In Vitro evidence made some believe that therapeutic levels would not be attained, however that was incorrect, e.g. see [Ruiz]." ibid.