Ivermectin is approved for use in humans for treating both internal and external parasites. It has NEVER been approved for use to treat Covid. In addition the ivermectin product for animals and humans is different. You can also OD on ivermectin . No rational doctor is going to prescribe Ivermectin for you to cure your covid. As far as how many people take ivermectin to treat parasites every year, I dont have those numbers. Then again neither do you. Maybe you have some laying around your house to treat your lice. I dont know. But like I said, feel free to take it to treat your covid if you get it.