In short, it improves blood flow to the heart, giving the user more energy and oxygen to the brain.
// Trimetazidine is listed in the World Anti-Doping Agency (WADA) prohibited substances list under the category of "hormone and metabolic modulators", and its use is prohibited at all times "in- and out-of-competition." In 2014, Chinese Olympic champion swimmer Sun Yang tested positive for trimetazidine, which had been newly banned four months earlier and classified as a prohibited stimulant at the time by the World Anti-Doping Agency (WADA). Sun was consequently banned by the Chinese Swimming Association for three months. In January 2015, WADA reclassified and downgraded trimetazidine from a "stimulant" to a "modulator of cardiac metabolism." In February 2022, media reported that Russian Olympic Committee (ROC) skater Kamila Valieva allegedly tested positive for trimetazidine on one occasion two months prior to the 2022 Winter Olympics, while noting that neither the IOC nor the ISU had confirmed the positive test. //