Colin Farrell is being treated for exhaustion and dependency on prescription medication, his publicist said.
The statement, from publicist Danica Smith, said Farrell had checked himself into a treatment center, which wasn't identified.
The medication was prescribed to the actor after a back injury.
Farrell, 29, stars in the upcoming adventure-drama "The New World." His screen credits also include roles in last year's "Alexander" and the 2002 thriller "Phone Booth."