Role of Pharmacogenomics in Personalized Medicine: A New Frontier in Drug Therapy Optimization

Abstract

Pharmacogenomics integrates pharmacology and genomics to study how genetic variations influence individual responses to medications. Incorporating genetic data into clinical decision-making allows more precise drug selection and dosing, improving effectiveness, reducing adverse effects, and promoting truly individualized therapy. This review outlines the development and clinical importance of pharmacogenomics and highlights its application in drugs such as warfarin and clopidogrel, where gene variants including CYP2C9, VKORC1, and CYP2C19 significantly affect metabolism and treatment outcomes. Genetic testing helps determine appropriate dosing to achieve optimal anticoagulant and antiplatelet effects. The review also emphasizes pharmacogenomics as a foundation of precision medicine, enabling clinicians to understand how genes influence drug metabolism, transport, and targets. Clinical pharmacists play a key role through patient counselling, dose adjustments, and integrating genotype-guided therapy into practice. Despite its promise, challenges such as high testing costs, limited awareness, and concerns about privacy and consent continue to hinder widespread adoption. As genomic technologies, bioinformatics, and digital tools advance, pharmacogenomic data are becoming easier to apply in routine care. Ultimately, pharmacogenomics is set to reshape modern therapeutics by shifting drug therapy toward a more predictive, preventive, and patient-centred approach.