Quad Cities River Bandits catcher Cody Stanley whiffs at a pitch during a game last year.

St. Louis Cardinals catching prospect Cody Stanley, a Midwest League All-Star for the Quad Cities River Bandits last year, was suspended 50 games Tuesday for violating Minor League Baseball’s drug program.

Stanley, a fourth-round pick in 2010, tested positive for Methylhexaneamine and Tamoxifen. According to a story about the suspension on MiLB’s website,

Tamoxifen blocks the actions of estrogen and is used to treat and prevent some types of breast cancer. It is sometimes taken to mask the use of other performance-enhancing substances. Methylhexaneamine is the main ingredient in several pre-workout supplements like Jack3d, a substance banned by Major League Baseball. It’s believed to increase focus and energy.

In 101 games with the River Bandits last year, Stanley hit .264 with 11 HR and 66 RBI. He is ranked No. 24 among Cardinals prospects in this year’s Baseball America Prospect Handbook.