Limitless tops US box office
The mystery-thriller, which stars Bradley Cooper, Anna Friel and Abbie Cornish, tells the story of a writer, who discovers a top-secret drug which gives him super human abilities.
Last week's number two, Rango, retained its position while Battle: Los Angeles slipped to three.
The Lincoln Lawyer, starring Matthew McConaughey, Marisa Tomei and Ryan Phillippe, opened at four. It focuses on a lawyer, who does business from the back of his town car while representing a prestigious Beverly Hills client.
Simon Pegg, Nick Frost and Seth Rogen's Paul, which tells of two British comic-book fans who met an alien on their travels across the US, debuted at five.
Last week's number three, Red Riding Hood, slipped to six, while The Adjustment Bureau dropped to seven.
Mars Needs Mums, Beastly and Hall Pass rounded off the top ten.