This text investigates the fundamental principles governing how drugs interact with biological systems to produce therapeutic effects. The author, John A. Bevan, provides a structured framework for understanding pharmacokinetics and pharmacodynamics, utilizing established physiological models to explain the mechanisms of drug action. The work serves as a foundational guide for students and practitioners to grasp the complex relationship between chemical compounds and human biological responses.

The subject matter points to a dense, specialist text designed for academic instruction in medical and pharmaceutical curricula. The framing suggests a rigorous, foundational introduction to the discipline, prioritizing clarity in technical concepts for the student reader.