# Genetic Testing Could Optimize Medication Prescriptions New research reveals how DNA variations significantly impact individual drug responses and treatment efficacy. - **Source:** [The Conversation – US](https://theconversation.com/us) - **Published:** 2026-11-11 - **Topic:** [health](https://brifing.si/c/health) - **Original article:** - **On Brifing:** https://brifing.si/s/eb8c2264-4b26-4e22-8fac-3124f6c5db8a ## Genetic Impact on Medication Pharmacogenomics examines how specific DNA variations influence individual responses to prescribed medications. Research indicates that every person carries genetic differences affecting drug metabolism, yet clinicians often rely on trial-and-error prescribing methods. This study highlights that DNA plays a critical role in determining whether a patient experiences therapeutic benefits or adverse side effects. ## Widespread Genetic Variations Analyzing data from nearly 100,000 participants in the All of Us Research Program, researchers found that every individual possessed at least one relevant genetic variant. Approximately 99.5% of participants carried variants where medical guidelines suggest dosage adjustments or alternative drugs. These findings underscore the prevalence of genetic factors in routine clinical pharmacology. ## Prevalence of Drug Interactions The study revealed that 24% of participants had already taken medications affected by their specific genetic makeup. Common examples include statins for cholesterol management and drugs like omeprazole used for stomach acid reduction. Because health records can be incomplete, these figures likely underestimate the true frequency of these gene-drug interactions in patients. ## Addressing Research Diversity Gaps Historically, genetic research has focused heavily on individuals of European ancestry, leaving significant data gaps for other populations. By utilizing the All of Us Research Program, this study improved data diversity by reporting frequencies of hundreds of genetic variants across various ancestries, providing a more inclusive foundation for future precision medicine applications. ## Identifying Novel Genetic Variants Researchers identified 17,704 previously unreported variants within the regions of genes that encode proteins. Computer modeling suggests that approximately one-quarter of these new variants may significantly alter how the human body processes drugs. These discoveries expand the existing databases that clinicians and researchers rely on for making informed, patient-specific treatment decisions. ## Limitations of Genetic Testing While the study demonstrates that DNA variation is common, it does not confirm that routine testing will improve outcomes for every patient. Genetics represents only one variable in drug processing; factors such as age, liver function, kidney health, and concurrent medication use also play essential roles in determining how a drug behaves. ## Advancing Precision Medicine Goals The research serves as a clear example of how large-scale initiatives like the All of Us Research Program can advance precision medicine. By providing more comprehensive data, these efforts help clinicians move away from generalized prescribing. The ultimate goal is to optimize medication therapy by integrating genetic insights into standard clinical practice. ## Future Clinical Implications Although genetic testing is not yet a routine part of prescribing, the direction of this research is promising. Pharmacogenomics offers potential benefits for a vast number of patients who take medications daily. Future efforts should focus on establishing clear protocols for when clinicians should order these tests to maximize patient safety. ## Sources covering this story - https://theconversation.com/you-likely-have-genes-that-affect-how-well-your-medications-work-testing-for-them-could-improve-treatment-296352 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._