The book Geriatric Pharmacology: Drug Therapy in the Elderly serves as a comprehensive guide to understanding the complexities of medication use in aging populations. It begins with an introduction to geriatric pharmacology, framing the field as a critical area of study in light of the rapidly growing elderly population worldwide. The introduction establishes the importance of tailoring drug therapy to older adults, acknowledging that what works in younger populations cannot simply be applied to elderly patients due to profound changes in physiology, drug handling, and therapeutic response. This sets the stage for a nuanced exploration of how aging influences every step of pharmacotherapy and why clinicians, researchers, and policymakers must address these challenges. The book then explores the impact of aging on physiology, providing a detailed overview of the natural changes that occur in organ systems with advancing age. Cardiovascular, renal, hepatic, and central nervous system alterations are examined in the context of their relevance to drug therapy. By linking physiological changes to clinical outcomes, the text highlights why elderly patients often require individualized approaches. This foundation is essential for understanding the pharmacokinetic and pharmacodynamic variations that follow. Finally, the book looks ahead to the future of geriatric pharmacology, highlighting the potential of pharmacogenomics, digital health tools, and evolving clinical guidelines to transform care for the elderly. Geriatric Pharmacology: Drug Therapy in the Elderly offers a comprehensive, evidence-based, and practical framework for addressing the unique challenges of drug therapy in older adults, making it an invaluable resource for clinicians, researchers, and students dedicated to improving health outcomes in this growing population.