Prevention of graft rejection while minimizing morbidity remains the single most important objective in liver transplantation. Advances in immunosuppression have provided excellent patient and graft survival with relatively low incidences of acute rejection. However, it is apparent that the toxicity of the present immunosuppressive drugs accounts for much of the morbidity after transplantation. Attention is now being focused on combination drug therapies to reduce morbidity while maintaining the excellent results achieved with present immunosuppressive agents.