Baltimore lefthanded reliever Troy Patton was suspended 25 games without pay after testing positive for amphetamine use, MLB said Friday.
Patton's suspension is effective at the beginning of the 2014 season.
The Baltimore Sun reported that Patton took an Adderall pill four days just before the season ended.
"I took one because I was stupid," Patton told reporters, according to The Sun. "It was the end of the season. It was just a stupid mistake. I don't have trouble focusing all the time, it just enhances focus in certain situations, and I was just tired, basically. I don't want to list that as an excuse. I know I took a banned substance. It was just a poor lapse in judgment."
Patton, 28, was 2-0 with a 3.70 ERA in 56 games in 2013 and was even better in 2012 with a 1.02 WHIP and 2.43 ERA in 54 games.
Patton was acquired from Houston in the six-player swap that sent Miguel Tejada to the Astros following the 2007 season.
According to the newspaper, the O's will look at internal options to replace Patton, including Mike Belfiore, who was Baltimore's No. 24 prospect entering the 2013 season.