I've had horses for a very very long time and if I remember correctly when it first came on the market it was called Abermectin before changing to Ivermectin. Now some of the wormers have moxidectin but I won't use them anymore as I've had some crook horses from it after worming with a moxidectin paste the first couple of times. Never had it with the Ivermectin wormers. Interesting film ,thanks for sharing it.