Materials in the nanoscale range are used as diagnostic tools or to deliver therapeutic medicines to precisely targeted locations using nano delivery systems, a relatively new but fast emerging field of medicine. By delivering precise medicines to specified sites and targets, nanotechnology has the potential to significantly improve the treatment of chronic human diseases. Recently, there have been a number of remarkable uses of nanomedicine (chemotherapeutic agents, biological agents, immunotherapeutic agents, etc.) in the treatment of various disorders. Clinical uses of nanomedicines, both current and potential, are reviewed, as are the advantages and disadvantages of nanomedicines for drug delivery from synthetic/natural sources. We have also included data on future predictions and developments in the field of nanomedicine.