Yes, there are less side effects of ivermectin, when taken at proper dosage for the condition you are treating (parasites)
Yes, there are side effects, as demonstrated by idiots taking horse dewormer at hundreds of times the concentration that is appropriate for human metabolism.
No, there is absolutely no evidence that ivermectin does any more than the square root of jack shit against bacterial or viral infection. It's a fucking poison that kills parasites while being weak enough to leave the host alive. The end.
We know how these things work, what they do in the body, and where they will have absolutely no effect without uselessly trying anyway. There is no mechanism for ivermectin to do jack shit to stop uncontrolled cellular replication without killing ALL celllular replication by killing the host. Period.