To increase the drug response, the pharmacogenomics applicable in pharmacotherapy by studying genomic level of the human being pharmacogenomics examine the role of entire genome in both disease susceptibility and drug response; in an attempt to identify specific genes, human genetic variation RNA and protein expression differences, that are associated with specific diseases and that may be targets for new drugs. Pharmacogenomics show ability to explore not only drug metabolizing polymorphisms but also drug target polymorphism, drug transporter polymorphisms.