Grafalon belongs to a group of medicines called immunosuppressants. Immunosuppressants are used to prevent the body from rejecting a transplanted organ. Grafalon is given to one who have had or are going to have an organ transplant. This is to prevent the body’s immune system from rejecting a new organ. Grafalon helps to prevent or to stop this rejection response by blocking the development of special cells, which would normally attack the transplanted organ. Grafalon is used as part of immunosuppressive therapy, together with other immunosuppressive medicines.