The combination of Pharmacology and genomics is Phmacogenomics it is the study of person’s genes response to drugs testing is done on blood and saliva. Pharmacogenemics helps doctors to select the drugs of best dose suitable for persons.The reality of personalized medicine has become more imminent because of the increased awareness of the shortcomings in the delivery of drugs with adequate benefit/risk to patients, a better molecular understanding of how to optimize drug selection and dosing, and an increased demand for integrating more clinically relevant genetic information into the drug development process to improve both innovation and productivity.The Pharmacogenomics Journal is a print and electronic journal, which is dedicated to the rapid publication of original research on pharmacogenomics and its clinical applications. Key areas of coverage include: •Effects of genetic variability on drug toxicity and efficacy •Identification and functional characterization of polymorphisms relevant to drug action •Pharmacodynamic and pharmacokinetic variations and drug efficacy •Integration of new developments in the genome project and proteomics into clinical medicine, pharmacology, and therapeutics •Clinical applications of genomic science •Identification of novel genomic targets for drug development •Potential benefits of pharmacogenomics.