I didn't use Ivermectin on my birds, I just used Vaseline petroleum jelly, which suffocates them. Any thick grease will do. Slather them up real good, do the whole flock, and do them again 5 to 7 days later to kill the eggs that hatch. If the scales are really lifted, realize that they aren't going to look normal right away. The old scales have to shed to reveal the healthy scales underneath. I do them at night when they are on the roost and don't see well, it's easier than running them down during the day. We put a leg band on each bird we treat the first time, then take it off when we treat the second time.