Neuropathology of Drug Addictions and Substance Misuse, Volume 3: General Processes and Mechanisms, Prescription Medications, Caffeine and Areca, Polydrug Misuse, Emerging Addictions and Non-Drug Addictions is the third of three volumes in this informative series and offers a comprehensive examination of the adverse consequences of the most common drugs of abuse. Each volume serves to update the reader’s knowledge on the broader field of addiction as well as to deepen understanding of specific addictive substances. Volume 3 addresses prescription medications, caffeine, polydrug misuse, and non-drug addictions. Each section provides data on the general, molecular, cellular, structural, and functional neurological aspects of a given substance, with a focus on the adverse consequences of addictions. Research shows that the neuropathological features of one addiction are often applicable to those of others, and understanding these commonalties provides a platform for studying specific addictions in more depth and may ultimately lead researchers toward new modes of understanding, causation, prevention and treatment. However, marshalling data on the complex relationships between addictions is difficult due to the myriad of material and substances.