The present case study was carried out with the objective of Identifying by means of Rational Emotive therapy techniques if drug use influences the social development of a 17-year-old adolescent from the “crati” rehabilitation center in the city of Cuenca. In this way, the methodology used in this work is aimed at the scientific investigation of variables such as: Drug use and social development, which are exposed in this case study, and the use of different techniques was required. Rational Emotive Therapy, which allowed the proposed objective to be fulfilled in an optimal way to later provide the corresponding therapy to the patient through a therapeutic plan which includes a procedure in an Individual Therapy aimed at modifying those Beliefs that the patient presented during the psychological intervention. All this in order to overcome your problem and improve your quality of life, both personal and social.The present case study was carried out with the objective of Identifying by means of Rational Emotive therapy techniques if drug use influences the social development of a 17-year-old adolescent from the “crati” rehabilitation center in the city of Cuenca. In this way, the methodology used in this work is aimed at the scientific investigation of variables such as: Drug use and social development, which are exposed in this case study, and the use of different techniques was required. Rational Emotive Therapy, which allowed the proposed objective to be fulfilled in an optimal way to later provide the corresponding therapy to the patient through a therapeutic plan which includes a procedure in an Individual Therapy aimed at modifying those Beliefs that the patient presented during the psychological intervention. All this in order to overcome your problem and improve your quality of life, both personal and social.El presente estudio de caso se realizó con el objetivo de Identificar mediante técnicas de la terapia Racional Emotiva si el Consumo de drogas influye en el desenvolvimiento social de un adolescente de 17 años del centro de rehabilitación “crati “de la ciudad de Cuenca. De tal manera, la metodología utilizada en este trabajo está dirigida a la investigación científica de las variables tales como: Consumo de drogas y desenvolvimiento social las cuales se encuentran expuestas en el presente estudio de caso, además se requirió el uso de diferentes técnicas de la Terapia Racional Emotiva, las cuales permitieron que el objetivo planteado sea cumplido de manera óptima para posteriormente brindar la terapia correspondiente al paciente mediante un plan terapéutico el cual contempla un procedimiento en una Terapia Individual dirigida a modificar aquellas Creencias que el paciente presento durante la intervención psicológica, todo esto con la finalidad de que supere su problema y mejore su calidad de vida tanto personal como social.