It's not quite true to position it as a "horse de-wormer", but there is a lot of misinformation on various sites, (
e.g. the FDA site, and factcheck.org etc.), where they put up pictures of horses under the Ivermectin heading, and position it as if quacks just decided to start using veterinary medicines on humans. Unfortunately, people are buying into it.
The truth is, it's been prescribed for humans for some time, and we have a ton of usage data. It's dirt cheap, and might really help in poorer countries where they don't have an abundance of cold-storage chains etc. IF it is proven to work, it can also help keep us from overrunning medical facilities the way
@mrhickory and others are describing.
I makes you wonder why they'd go to the length of positioning it in this manner. Personally, I don't care WHERE help comes from. Repurposed drugs, new vaccines, herbal remedy or otherwise. I just want to be able to manage this pandemic in the most effective and efficient manner possible, with no agendas. I wish everyone involved had that desire.