The thesis presents a study of addictions through the psychoanalytic point of view. The view that presides the study is that the fellow addict runs an appeal to the Other through the use of the drug to make the paternal function present. From this perspective, the drug contains a message addressed to another so that a cut should be operated in the relationship without limits built with the drug. It will not treat the organic effects produced by the use of the substance, but the unique function that the drug might occupy a person. In the first chapter, the introduction, the object of the work will be circumscribed: the addictions. In the second chapter it will examine the phenomenon of drugs in perversion, in neurosis and psychosis. In the third chapter, it will launch a glimpse into the drug through the concepts of superego, drive satisfaction, ego ideal and the death drive. In the fourth chapter it will present the construction of dependence relations in addictions and how drug use can serve as a call to a father. We will also study the signifier in the dialectic of the desire in order to locate the place of the drug to the addict. Then, assuming that the weakness or ineffectiveness of the paternal function provides the compulsion to object drug as a way to solve the anguish caused by the effects of castration, it will investigate the drug problem from the significant Name of the Father and the paternal metaphor.