Higher levels of Testosterone can improve your focus, as well as a lot of other good shit. If you're older, I would look into the weekly shot. As soon as my levels start dropping I know Im going on the juice..
These is some stigma surrounding the use of amphetamines, but the stuff can be used very effectively without leading to abuse. Ive been a fairly regular user of Adderall for serveral years, and I cannot overstate the positive impact it's had in my life.
Looking back on my life through college, I exhibited a lot of ADD symptoms-- but because of a high aptitude no one really noticed them. During college I can't recall ever sitting down to study for more than a half hour stretch, and my grades suffered accordingly. The first time I ever used Adderall it felt as if a wet towell was lifted from my brain. It was an insight into how normal people were supposed to feel, and a shock to learn how impaired my baseline function was. With the amphetamine the restristor plate was removed, and for the first time I was operating at my potential.
Had I put these pieces together earlier in life, things may have turned out differently. But with a soul-crushing finance job as the best path open to me, I survive the day through some better living through chemistry.
If you even have a suspiction you may have ADD, you owe it to yourself to try the meds.