For a list of immunosuppressive drugs, see the transplant rejection page. Error creating thumbnail: This article needs additional citations for verification. Immunosuppressive drugs or immunosuppressive agents are drugs that inhibit or prevent activity of the immune system. They are used in immunosuppressive therapy to: Prevent the rejection of transplanted organs and tissues Treat autoimmune diseases or diseases that are most likely of autoimmune origin. Treat some other non-autoimmune inflammatory diseases (e.g. , long term allergic asthma control)...