This text investigates the fundamental principles of how chemical substances interact with human biological systems to produce therapeutic or toxic effects. The author, James David Provins Graham, utilizes his clinical and academic background to establish a framework for understanding drug action, absorption, distribution, metabolism, and excretion. The book serves as a foundational guide for students and practitioners to bridge the gap between basic chemical properties and clinical application in human patients.

Experts recognize this work as a structured introduction suitable for those beginning their study of medical pharmacology. Readers frequently note the clarity of the prose and the logical progression of concepts from basic principles to systemic applications.