studies that used it properly as a prophylactic show around a 90% reduction in mortality and around 50% reduction in infection rate. All the studies claiming it didn't work used it post-infection which even the proponents of ivermectin claimed wouldn't work
https://www.cureus.com/articles/111851-regular-use-of-iverme...
here's the main study used to claim it doesn't work- note the participants are already confirmed to have covid so the study is already worthless and essentially done in bad faith
https://jamanetwork.com/journals/jama/fullarticle/2797483
and here's another doing the same thing
https://www.nejm.org/doi/full/10.1056/nejmoa2115869
not saying Ivermectin is some miracle drug like many, but simply downplaying it as "horse medicine" is just as bad