The Medical Model of Addiction: Historical Foundations, Neurobiology, Clinical Implications, and Contemporary Critiques

Abstract The Medical Model of Addiction represents one of the most consequential paradigm shifts in modern medicine, redefining addiction from a moral or social failing into a chronic, relapsing medical disorder grounded in neurobiology, genetics, and clinical science. By conceptualizing addiction as a disease involving dysregulation of brain reward, motivation, memory, stress response, and executive control circuits, this model has reshaped diagnostic systems, legitimized pharmacologic and behavioral interventions, and catalyzed the development of Addiction Medicine as a recognized medical specialty. This article provides a comprehensive, clinically oriented, and neurobiologically grounded examination of the Medical Model of Addiction. It traces the historical evolution of the disease concept, examines the neurobiological and genetic mechanisms underlying addictive behavior, reviews contemporary diagnostic and therapeutic frameworks, and critically evaluates ethical, social, and policy implications. While acknowledging ongoing critiques regarding medicalization, agency, and responsibility, this review argues that the Medical Model remains indispensable for evidence-based treatment, integration of addiction care into mainstream medicine, and the development of effective public health responses to substance use disorders.