The clinical perspective used to understand a patient with an addiction affects the course of treatment and the possibilities for recovery. Positivist and pharmacological models have become popular in the treatment of addictions. These models claim that addiction is primarily a pharmacological occurrence and privilege the biochemical effects of specific substances over the intrapsychic conflict of the patient in order to justify the phenomenology of addiction. Although psychoanalytic approaches have been previously used to treat addictive patients, they have frequently been considered unsuitable and inadequate for such cases. The author's purpose is to use the scope that psychoanalytic comprehension provides to examine the subject who is addicted in relation to his or her maturational development; considering the roles played by pleasure, ego defects, and defensive behavior, derived from case vignettes, in order to illustrate the role of intrapsychic life in the maintaining of an addiction.