No no, that's ketamine, you're thinking of the horse dewormer ivermectin.

And yes yes I know it's used for humans as well, but the reich-wingers were getting it from veterinary suppliers since you can't get the human version without a prescription. The idiots didn't come to think that the dose used for horses is much bigger than what's used for humans so they took ridiculously high doses, shat out their gut lining and thought that was a sign it was helping.