> > Ivermectin tablets are approved [...] some parasitic worms.

Doctors prescribe stuff off-label all the time. I've taken off-label prescriptions before. Our son takes off-label prescriptions. The fact that X has not been approved for Y doesn't mean much.

Now that's not saying anyone should take ivermectin for COVID-19. I myself probably wouldn't, and if a doctor wanted to prescribe it to me I'd be sceptical. But my reasons for not wanting to take ivermectin for COVID-19 have little to do with the issue of on-label vs off-label use.