Olympic and world champion sprinter LaShawn Merritt has accepted a provisional suspension after testing positive for a banned drug, his lawyer said.

According to Thursday's release from lawyer Howard Jacobs, Merritt used an over-the-counter male enhancement product that contained substances that caused him to fail three successive tests between October and January.

Merritt said he hopes his family, friends and sponsors will forgive him for making "a foolish, immature and egotistical mistake." The 400-meter runner will not compete until the case has been decided.

USA Track & Field CEO Doug Logan said in a release he is "disgusted by this entire episode."

"He has now put his entire career under a cloud and in the process made himself the object of jokes," Logan said. "In this day and age, a professional athlete should know better."

Merritt was recently notified that the presence of DHEA was the cause of his positive test. DHEA is short for dehydroepiandrosterone, which is a steroids precursor banned by the U.S. Anti-Doping Agency.