Starting on Day +5, you will receive Tacrolimus nonstop by vein until you are able to take it by mouth to help lower the risk of graft-versus-host disease (GVHD). You will then take Tacrolimus by mouth 2 times a day for about 3 months. After that, your Tacrolimus dose may be lowered if you do not have GVHD. Your doctor will discuss this with you.