Guanfacine
"I'm in my late 20's and tried it for ADHD...all I can say is that it really messed up my sleep. It also severely worsened my depression. It has a long half life. Benefits I did notice is that it seemed that my memory improved somewhat, for example could remember several songs playing in a row, also focus seemed improved. I'm considering adding trazodone in hopes of aboring its negative effect on sleep.  For anyone complaining about blood pressure side effects, lower your dose."