Subjects administered MMF as part of their immunosuppression regimen after lung transplantation have a high incidence of GI symptoms related to the known side-effects of this drug. Previous studies have shown that GI symptoms are an important predictor of health related quality of life in other solid organ transplants (1). GI complications are common after lung transplant (2). We hypothesize that lung transplant patients converted from MMF to Myfortic will have significant reduction in severity of GI complaints. We also hypothesize that improvement in the severity of GI complaints will lead to an improved quality of life in these subjects. The study also includes data to evaluate the effect of GI complaints on health related quality of life.