Los Angeles: Actor Robin Williams has checked into rehab for the second time to maintain his long-term sobriety.
The 62-year-old is seeking treatment at Hazelden Addiction Treatment Center in Minnesota.
"After working back-to-back projects, Robin is simply taking the opportunity to fine-tune and focus on his continued commitment, of which he remains extremely proud," said his representative.
In 2006, he had checked himself into a substance abuse rehabilitation centre after admitting he was an alcoholic following two decades without booze.
The `Mrs Doubtfire` star also battled with cocaine addiction in the late 1970s and early 1980s, but quit the drug following the death of his close friend John Belushi in 1982 and the birth of his son Zachary in 1983.