A stronger version of Adderall (forget what that jerk below me said) Concerta is a drug that gets you focused. But before that, it JACKS YOU UP HARD. You get twitchy, nervous, anxious, paranoid, and have panic attacks. It drives you crazy, gives you mood-swings and just fucks you up in general. After that stage passes though, you are a laser guided focus machine. I personally take a pretty big 72mg dose, and let me tell you, as soon as the shakes end, I can write a 15 page research paper on a subject I have never studied. Say what you will, but this shit works.
I took some concerta, and I got my paper written in record time. Right after I made a tinfoil hat to keep out the governments mind control rays.