I have been taking Aderrall XR for 6 years now and went from 20mg daily to 25mg twice a day over the years. Anything less makes me very tired and depressed. I do not abuse this drug but I am worried about addiction. Is 50mg normal or should I have a serious talk with my doctor about lowering dosage. This has been a wonder drug for me but I am worried that I can't function without it.