Originally Posted by xxEmilyxx
Yeah I know. I just wondered because you see the Parelli students on Youtube and like "Ohh he was an untrainable crazy mustang...and then we used Parelli" and the mustang is now bombproof.
Those people were likely working with a certified trainer, not just on their own with the help of some videos.
If he was my horse, I'd be treating the trush daily, then restarting him. Using a sedative is dangerous, is a crutch and teaches him zero. All it manages to do is get him ridden. You want a trained horse that doesn't need to be drugged for his entire riding career, I'm assuming.
My suggestion is to find a reputable trainer and get help from the basics up. You'll end up enjoying your horse so much more than you are now.