Medicinal drugs save patients, but compounds fail in many cases and even cause death in others. According to the US Food & Drug Administration's Center for Education and Research on Therapeutics, adverse drug reactions kill 100,000 Americans each year, registering as the fourth leading cause of death.[1] In the United States at least, prescribed drugs are more lethal than AIDS or automobile accidents. The problem is, no physician can know for certain how a patient will respond to a drug. Pharmacogenomics, however, could help alleviate that problem.