The document discusses the correlation between pharmacokinetics (PK) and pharmacodynamics (PD) in drug therapy, emphasizing their roles in optimizing treatment efficacy and minimizing toxicity. It outlines key concepts, including the dose-response relationship, therapeutic window, and time-action profile, as well as the importance of mathematical PK/PD models in individualizing therapy and managing drug interactions. Understanding this relationship is essential for designing effective dosing regimens and predicting therapeutic outcomes.