The difference between bone marrow transplantation after reblocking and leukemia 1. The main reason for reblocking bone marrow transplantation is that you do not want to have rejection after transplantation. 2, in order to prevent rejection after transplantation, anti-rejection drugs must be slowly reduced. 3, generally after transplantation, check the concentration of anti-rejection drugs to ensure that the effective therapeutic concentration, six months later, if there is no rejection and then slowly start to reduce the drug. Generally 1 year without rejection can stop the drug. If rejection occurs during treatment, first check whether the concentration of the drug is sufficient. Then other drugs, such as hormones, should be added.