Rapamycin, or sirolimus, is a potent immunosuppressant and macrolide compound with many medical applications. Rapamycin’s primary use is to prevent organ transplant rejection by suppressing the immune system, thus aiding in the body’s acceptance of the new organ. Additionally, its antiproliferative properties make it helpful in treating certain types of cancers and rare diseases. Beyond its medical applications, Rapamycin has attracted significant interest in research due to its potential to extend lifespan and delay aging, as shown in various animal studies. Despite its promising benefits, Rapamycin is advised with caution due to its potential side effects. These side effects of Rapamycin include an increased risk of infections and complications due to its immunosuppressive nature.