Limitless (2011)

With the help of a mysterious pill that enables the user to access 100 percent of his brain abilities, a struggling writer becomes a financial wizard, but it also puts him in a new world with lots of dangers.
Review: Oh wow. This was such a clever film. Why have I not heard about this before? Not only is Bradley Cooper *fine* this is a twisting-turning very clever story, and I loved every minute of it. 
Highly recommended.