I types this up a few breads ago.
I have the supporting Ivermectin study handy but not the other two right now.
This is if you are exposed.
The reason for the overlapping treatments is because Ivermectin, NAC, and other compounds need to come into contact with either the receptors or the virus to work. This brings probability and also chaos into the equation that they will "hit" each other.
Anyway, part of an ongoing protective strategy.