Cyclosporine is an immunosuppressant used for graft transplant rejection and other immune disorders. Cyclosporine has modified versions such as Cyclosporine A, B, C, D, etc. However, Cyclosporine is also called as Cyclosporine A in many research articles. Are they the same compound or is there any structural and functional difference between them? Also, for modified versions there are different dosage recommendations, but in this case, does the dosage remain same?