Understanding Drug Exposure And Drug-Drug Interactions

As drug therapies become increasingly complex, understanding the factors that influence drug exposure is critical to patient safety and treatment effectiveness. This issue explores how intrinsic factors, including age, biological sex, genetics, and disease state, as well as extrinsic factors such as concomitant medications, supplements, food, and alcohol, can affect pharmacokinetics and ultimately influence clinical outcomes. It examines the mechanisms underlying drug-drug interactions (DDIs), the regulatory expectations for their evaluation, and the role of clinical studies in identifying potential risks throughout development.

Readers will gain insight into emerging considerations such as pharmacogenetics, sex-based differences in drug metabolism, and strategies for assessing clinically meaningful interactions. A featured case study examines the design and execution of two Phase I DDI studies evaluating a novel cardiovascular therapy in combination with commonly prescribed anticoagulant and antiplatelet agents.

Together, these examples illustrate how proactive assessment of potential interactions can help minimize adverse events, inform dosing strategies, and support safer, more effective drug development.