This practice guideline has been approved by the American Association for the Study of Liver Diseases and the American Society of Transplantation. These recommendations provide a data-supported approach to management of adult patients who have successfully undergone liver transplantation. They are based on the following: (1) a formal review and analysis of recently published world literature on the topic (via a MEDLINE search); (2) A Manual for Assessing Health Practices and Designing Practice Guidelines (American College of Physicians)1; (3) guideline policies,2 including the American Association for the Study of Liver Diseases policy on the development and use of practice guidelines and the American Gastroenterological Association policy statement on guidelines 3; and (4)the experience of the authors in the specified topic. Intended for use by physicians and health care providers working with adult recipients of liver transplantation (LT), these recommendations suggest preferred approaches to the diagnostic, therapeutic, and preventive aspects of care. They are intended to be flexible, in contrast to standards of care, which are inflexible policies to be followed in every case. Specific recommendations are based on relevant published information.