Limitless stars Bradley Cooper as Eddie, a struggling writer who is also having trouble making ends meet. He can't get anything done, doesn't meet deadlines and isn't happy with where he is in life. He runs into an old friend, who introduces him to the pharmaceutical drug, NZT, which results in the user being able to reach their full potential and use 100% of their brain potential.
Eddie hangs onto the pill and then finally decides to use it. When he does, his whole world changes. He can recall everything he sees and hears, learns insanely fast and even develops strong people skills and street smarts. He reminds me of Neo in the Matrix, when computer programs are introduced into his brain. He then decides to take on Wall Street and he rapidly increases his fortune.
He quickly rises to big wig status and people are catching onto the real reason behind his sudden rise. Those same people want his stash of NZT and will do anything it takes to get it, while Eddie does his best to not see it happen.