Mr Clever, parasites and virus are two very different things. You might as well eat cow dung if you do believe ivermectin works to ward off covid19. Hehehe.
Doctors in certain countries are bound by their health authorities which follows guidelines set by WHO and FDA.
But doctors on the frontline where battles are being waged are improvising and ignoring those guidelines based on colleagues advice and early trials already conducted.
This ties in perfectly with big pharma greed in making sure your cancer medicines don't work so that you keep buying expensive shit from them.
Ditto mRNA for Covid.