Ivermectin works very well, but it is a little more dangerous than HCQ. It cannot be used when pregnant, and drinking alcohol becomes deadly. Ivermectin inhibits the stuff that the virus sends to the nucleus to inhibit the defence mechanisms of the cell. Some doctors prescribe a combination of HCQ and Ivermectin.  Edit: DrBeen Medical Lectures:  https://youtu.be/rFE3XE68Wfw?t=81