Coadministration of tacrolimus and mycophenolate mofetil is frequent in kidney transplantation. Due to narrow therapeutic range of tacrolimus and mycophenolate mofetil, therapeutic drug monitoring with dose adjustment is required. Investigating pharmacokinetic interplay between two drugs enables fine dose adjustment, while mechanism of drug interaction between two drugs is still not well understood. Therefore, an open-label, three period, single dose trial is planned to investigate the drug interaction between tacrolimus and mycophenolate mofetil.