The concern with Ivermectin is side effects. I have heard other doctors say that the amount you'd need to take would cause serious side effects, as hydroxychloroquine did. (Remember how the death rate among those who got hydroxy was DOUBLE that of people who were untreated?)
That's not to say it won't work as a COMBO therapy, with a safe dosing level. But there need to be clinical trials to prove that it is safe for someone with COVID.