From Wikipedia about Hydroxychloroquine. It is on the World Health Organization’s List of Essential Medicines, the safest and most effective medicines needed in a health system until now when this Chinese Stooge showed up
The WHO study was not aimed at finding HCQ efficacious, it was designed to fail with hospitalized patients. The guarantee it would fail is also related to how this virus attacks the ACE2 expression sites on especially endo cells (blood vessels). Waiting to use HCQ until there is thrombosis occurring guarantees the HCQ will not save the patient.