I sent my husband to the feed store for Ivermectin and he came home with Permectin. I believe they told him at the feed store that this was essentially the same thing. The bottle gives no information without ripping off the label, which I don't really want to do in case I need to take it back. Can I use this to worm (as a preventive, I hope) my chickens and, if so, would it be the same 5 drop on the back of the neck dosing? Thanks for any help.