The term Pharmacogenomics comes from Pharmacology & Genetics. It is the study of how a gene affects the person’s response to drugs. The importance of Pharmacogenomics is to maximize the therapeutic efficacy and to minimize the drug toxicity in an individual patient. The therapeutic response of a drug varies from person to person. Some people show a tremendously effective response to the same drug while others will show a less therapeutic effect or side effects. The drug is metabolized by the body and its response is determined by genes as these genes affect the machinery responsible for metabolizing the drug. The understanding of genetics and drug metabolism help the doctor to determine the kind of drug & dose effective for an individual patient with lesser side-effects. Importance Pharmacogenomics is based on the fact that one drug does not work for all. The response towards a single drug varies a lot. There was not any system which can personalize the drug a...