provigil (modanifil) works best for me- it is a non-stim anti-adhd medication- it allows you to focus for hours on end. it also has some other added benefits- it will take your workouts to a whole other level as well....I just wrote a 1,200 page SOI for our MFG. facility and a 3,000 page validation master plan over the course of 12 weeks- I can literally block out pretty much all distractions while I am taking it:thumbsup: