The objective of immunosuppressive drugs used in solid organ transplantation is to achieve acceptable rejection rates, minimize infections, and prolong graft and patient survival. Cardiovascular disease is a major cause of death in kidney transplant recipients. The drugs commonly used to prevent rejection (calcineurin inhibitors [CNIs] and steroids) contribute to cardiac disease seen in transplant patients by increasing the risk of hypertension and diabetes. Direct cardiac toxicity of chemotherapeutic drugs such as doxorubicin is well-known but potential direct effect of CNIs on myocardium is less explored and understood. Cardiac toxicity a rare but serious adverse effect of tacrolimus, has been observed in patients receiving solid organ transplants such as liver, bowel and kidney. In this report, we describe a case of new onset severe dilated cardiomyopathy after kidney transplantation. Reversal of heart failure occurred after tacrolimus discontinuation and the switch to a mammalian target of rapamycin (mTOR) inhibitor: sirolimus
