Sirolimus, also known as rapamycin, is a versatile medication that has found applications in various medical treatments. Originally developed as an immunosuppressant to prevent organ rejection after transplantation, sirolimus has since been repurposed for other medical conditions, including certain types of cancer and autoimmune diseases. In this article, we’ll delve into the multifaceted uses of sirolimus and its efficacy in preventing organ rejection after kidney transplantation, along with essential information about this life-saving procedure.