I had it after being on the max dose of Invega Sustenna for many years, I ended up getting off that med and the TD went away after while, I take different meds now, and am hoping to not experience it again, thankfully it wasn't permanent the first time. I've read that there are meds out there that help with it now, something called ingrezza or something like that? I don't know much about it though, I hope you don't have to deal with that again