You're maybe thinking of Meldonium, which is banned. The drug was developed in the 1970s and is a very common OTC sale in eastern Europe. It was banned in 2016 when WADA decided it was possible it could be able to act as a performance enhancer. Maria Sharapova, a tennis champion, made the news later that year when she tested positive, and received a two year ban which was later shortened when the court determined she had originally started taking it years ago in good faith on a doctor's recommendation. About two hundred other athletes from eastern Europe across different sports received positive tests shortly after the ban as well, a lot of which were reversed when it turned out they were detecting use from 2015 (it takes months after use for it to stop showing on tests).