Just because you don't have anecdotes on your hand doesn't mean that's not the case. I don't know what your definition of "long-term" is, but ultiple specialists I have seen over the years happened to mention that they have patients who have been pretty much on the same stimulant prescription for ADD for 10+ years. I didn't reach that number of years yet, but I am getting close though. Once the specialist finds the drug and dosage that works for you, there should be pretty much no need for any changes to prescription or dosage. That seems to be pretty sustainable to me.