Cards' Minor Leaguer Medina suspended 50 games

St. Louis Cardinals Minor League pitcher Yeison Medina has been suspended 50 games without pay following a positive test for the stimulant heptaminol, Major League Baseball announced Tuesday.

Taking heptaminol is a violation of the Minor League Drug Prevention and Treatment Program. Medina's suspension will begin at the start of the 2015 season.

Medina, 21, went 4-1 with a 1.64 ERA this year in 19 games at the rookie level with the Gulf Coast League Cardinals.

Adam Lewis is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.