n. the study of how gene variations influence an individual’s response to medications. This study as applied to psychotropic medications is called psychiatric pharmacogenomics. Clinically, pharmacogenomic information offers a means of individualizing drug treatment through genetic testing to predict an individual’s response to various drugs and thereby to prescribe medication that is the most appropriate, with the fewest side effects, for that individual. Pharmacogenomics and pharmacogenetics are increasingly used synonymously.