1) Pharmacogenomics is a branch of pharmacology concerned with using DNA and amino acid sequence data to inform drug development and testing. An important application of pharmacogenomics is correlating individual genetic variation with drug responses.

2) A biotechnological science that combines the techniques of medicine, pharmacology, and genomics and is concerned with developing drug therapies to compensate for genetic differences in patients which cause varied responses to a single therapeutic regimen.

3) The study of the interaction of an individual's genetic makeup and response to a drug.

4) The study of how a person's genes affect the way he or she responds to drugs. Pharmacogenomics is being used to learn ahead of time what the best drug or the best dose of a drug will be for a person. Also called pharmacogenetics.