`The Bounty Hunter` star was in the Betty Ford Center in California, receiving treatment for substance abuse over the last three weeks, but was discharged earlier today (24.02.12).
His representative, Rupert Fowler, said: "Gerard has completed a successful course of treatment and has returned home in good health."
Gerard had entered the facility after realising he was becoming dependent on prescription drugs. His problems were allegedly triggered by the physical demands of shooting `300` in 2006 when he started taking painkillers to cope with numerous injuries he got while shooting the action film.
The problem got worse when the 42-year-old actor was badly hurt in a surfing accident when filming `Of Men and Mavericks` - which tells the true life story of late surfing icon Jay Moriarty - in December.
The Scottish star got caught in a 12ft swell at the infamous big-wave Northern Californian surfing spot Maverick`s.
After being pulled from the water onto a jet ski, he was taken to shore and driven to Stanford Medical Center where he was kept under observation for one night.