Pharmacogenetics is the study of how genetic factors influence individual responses to drugs. Variations in genes involved in drug metabolism and response can help explain differences in drug efficacy and toxicity between individuals. Understanding these genetic factors may allow doctors to personalize drug selection and dosing for each patient, improving outcomes by decreasing adverse reactions and increasing efficacy. However, concerns remain regarding the reliability of pharmacogenetic tests, healthcare providers' preparedness to apply this information, and potential issues around discrimination and privacy with a personalized medicine approach.