 Approximately 3-4 weeks post transplant, patients that met enrollment criteria and have consented to participate in the study will be instructed to take 720 milligrams of mycophenolate sodium orally twice daily for one week either separated from food by two hours fasting state or with a meal fed state. After one week, patients will be admitted for approximately 24 hours where they will continue to receive mycophenolate sodium with or without food. During this period, blood samples will be drawn at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 hours following the dose to evaluate levels of mycophenolic acid MPA and mycophenolic acid glucuronide MPAG. After 24 hours, patients will be discharged with instructions to take mycophenolate sodium in the opposite manner fed or fasting state than they had the week before. At the end of the second week the patients will return for a second PK evaluation with blood collection at the same time points following mycophenolate sodium dosing. 