Pharmacoproteomics is a rapidly advancing field in which the techniques of proteomics are applied to develop pharmaceutical agents. The word itself was coined only in 1997. However, this branch of study plays a major role in personalized medicine. The word proteomics itself means the study of proteomes, a proteome being the full complement of proteins expressed by an organism or tissue under specified conditions at a specified time. Proteomes are therefore dynamic, and a given human may have a proteome with as many as two million proteins. The use of this full set of proteins to study the effect of disease or drugs can substitute for much more complex assays in pharmacodynamics at a lower cost in time, financial output, and clinical risk.