The UFC has suspended Chris Leben for one year after the veteran middleweight failed a drug test.
"I like Chris and I want him to do well, but based on his actions, he's been suspended for one year," UFC president Dana White said. "If he needs professional help, we are going to be there for him.
"We want to see him succeed not only in the Octagon but in his personal life."
Leben (22-8) tested positive for oxycodone and oxymorphone after his second-round TKO loss to Mark Munoz on Nov. 5 at UFC 138 in Birmingham, England.
"I would like to make it known that I fully accept this suspension and apologize for embarrassing the UFC, my friends and family, and the sport of mixed martial arts," Leben said in a prepared statement. "I'm learning that I'm my own worst enemy sometimes.
"I can't succeed in the Octagon or in life behaving this way, I've got to make some real changes over the next year, and I'm going to focus on getting my life and career back on track."
It is the second suspension UFC has handed Leben. He tested positive for Stanozolol after a unanimous decision loss to Michael Bisping in October 2008.
In April 2008, Leben was sentenced to 35 days in jail for a probation violation stemming from a DUI charge.
Franklin McNeil covers mixed martial arts and boxing for ESPN.com. Follow him on Twitter at www.twitter.com/Franklin_McNeil.