Azathioprine is an immunosuppressive medication. It is used in rheumatoid arthritis, granulomatosis with polyangiitis, Crohn's disease, ulcerative colitis, systemic lupus erythematosus and in kidney transplants to prevent rejection. 

Tacrolimus is an immunosuppressive drug. It is used after allogeneic organ transplant to lower the risk of organ rejection and also as a topical medication in the treatment of T-cell-mediated diseases such as eczema and psoriasis.

Rapamycin, also known as sirolimus , is a macrolide compound that is used to coat coronary stents, prevent organ transplant rejection and treat a rare lung disease called lymphangioleiomyomatosis. It has immunosuppressant functions in humans and is especially useful in preventing the rejection of kidney transplants.

Everolimus is a medication used as an immunosuppressant to prevent rejection of organ transplants and in the treatment of renal cell cancer and other tumours. Much research has also been conducted on everolimus and other mTOR inhibitors as targeted therapy for use in a number of cancers.