Michael Phelps has been suspended from swimming following his recent DUI arrest, as the sport's governing body told him to dry out for the next six months.
USA Swimming suspended the 18-time Olympic champion, dealing a blow to his comeback and forcing him to withdraw from the 2015 world championships.
After Phelps' DUI arrest, the 29-year-old is banned from USA Swimming-sanctioned meets through April 6 for violating the official Code of Conduct.
Its executive committee approved the sanctions, which take effect immediately.
"Michael's conduct was serious and required significant consequences," said Chuck Wielgus, executive director of USA Swimming, in confirming the ban.
"We endorse and are here to fully support his personal development actions."
Michael is headed to a rehab program to better understand himself, the superstar athlete announced in the wake of his arrest, whatever that means.
Phelps can still train in North Baltimore, where he may or may not be dating Taylor Lianne Chandler, in preparation for the 2016 Rio de Janeiro Olympics.
He had come out of retirement earlier this year with his sights set on Rio.
Phelps had hung up his Speedo after the 2012 London Olympics, having set a record with 18 gold medals and 22 medals in four Olympic games.
"Michael accepts USA Swimming's sanctions," his rep said. "He has apologized for his actions and, as he shared yesterday, is taking steps to address them."
The punishment was its harshest ever imposed on its superstar, who was barred for three months after photos of him smoking weed surfaced in 2009.
Phelps was charged on September 30 with driving under the influence, excessive speed and crossing double lane lines I-95, blowing a .14 BAC.
If convicted on those charges, Phelps faces up to one year in jail, a $1,000 fine and the loss of his driver's license for at least six months.
His trial is scheduled for November 19.