Ivermectin has been on the market for decades, it's side effects are well understood. It's used all the time around the world.

Toxic controls was very unfortunate events of people consuming veterinarian formulations designed for animals that weigh 1000+ lbs and overdosing. That means only that there is enough desperate people, and very few physicians willing to supervise the treatment.

I would be far more concerned about it's efficacy and people getting treatment that they think will help, when in fact it does not.