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. Vernon, involved with a pharmaceutical company, gives Eddie a nootropic 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 colour of Eddie's irises while on the drug – his eyes becoming an intense shade of electric blue.