Drugs used to prevent the body from forming a normal immune response. Therapy is used to treat diseases (especially when organs must be transplanted) when certain antibodies must be inactivated.

The giving of medications that reduce the ability of the immune system to respond to stimulation by substances foreign to the body. Immunosuppressive therapy is used deliberately to prevent rejection of transplanted tissue.

Prevention of the development of a destructive immune response to foreign material in the body. When used following a transplant, for example, the therapy is intended to suppress the response by the recipient's immune system to the transplanted tissue derived from another individual.