adhd
"Very stable medicine in the sense of little personality change and no physical side effects other than loss of appetite in the first week. I am 58 years and believe this medicine is the first ADD medication that I have noticed is truly effective.  It has helped my concentration and increased the length of time I work without any distractions.  As some others have commented, some "passion" has been removed as a trade-off in of efficiency in work and a greater degree of focus.  I think my sense of humor has somewhat diminished and everything is more important in some ways and seriousness has replaced my having fun nature.  I believe on the whole it has made a positive improvement in the way I function."