Limitless is a 2011 American thriller film directed by Neil Burger and starring Bradley Cooper, Abbie Cornish, and Robert De Niro. It is based on the novel The Dark Fields by Alan Glynn.
Eddie Morra (Bradley Cooper), an author suffering from writer's block, living in New York, is stressed by an approaching deadline. His girlfriend Lindy (Abbie Cornish), frustrated with his lack of progress and financial dependence, breaks up with him. Later, Eddie meets Vernon Gant (Johnny Whitworth), the estranged brother of Eddie's ex-wife, Melissa (Anna Friel). Vernon, involved with a pharmaceutical company, gives Eddie a "smart drug", NZT-48. After taking the pill, Eddie finds himself able to learn much faster and recall memories from his distant past, with the only apparent side effect being a change in the color of Eddie's irises while on the drug – his eyes becoming an intense shade of electric blue. He uses this ability to finish ninety pages of his book. The next day, the effects having worn off, he seeks out Vernon in an attempt to get more. While Eddie is running an errand, Vernon is murdered. Eddie returns, calls the police and then discovers Vernon's NZT stash just before they arrive. Using the new miracle drug, Eddie quickly completes his book.