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Patent Granted Ciclosporin (INN/BAN) (pronounced /ˌsaɪkləˈspɔrɪn/);[1] cyclosporine (USAN); cyclosporin (former BAN); or ciclosporin A,[2] cyclosporine A, or cyclosporin A (often shortened to CsA) is an immunosuppressant drug widely used in organ transplantation to prevent rejection. It reduces the activity of the immune system by interfering with the activity and growth of T cells.