This study will be a randomized, open-label non-inferiority trial to assess the efficacy, safety and tolerability of budesonide in combination with low-dose FK and standard-dose MMF as post-OLT ISP in comparison to standard ISP (S-ISP). Subjects will include OLT patients age 18 years and older receiving their first single-organ living- or deceased-donor liver transplant. Subjects must have post-operative recovery of graft function and be able to take oral medications before beginning treatment according to the study protocol.