“…Moreover, to further simplify TDM, it was proposed that the concentration 2 hours after administration (C2) be used, because it has the strongest correlation with AUC0-4 [47]. Called C2 monitoring, its clinical usefulness was verified in prospective multicenter studies in renal [48], liver [49], and heart transplant patients [50]. In this way, the pharmacological agents used in transplantation medicine-namely calcineurin inhibitorspromoted the evolution of TDM and helped to realize the concept of individualized therapy.…”