BACKGROUND Suicide attempt in adolescents is a major global health problem. In order to prevent them, the risks factors need to be identified. The present study evaluates the clinical and epidemiological aspects of adolescent patients after attempted suicide, who were seen in an emergency department. METHODS Description of retrospective study of patients younger than 18 years who visited emergency department unit after a suicide attempt, during the period from 2008 to 2012. RESULTS A total of 241 patients were included, of whom 203 were female. The median age of the patients was 15.6 years. Psiquiatric history was present in 65.1% of the patients. The most frequent suicide mechanism was drug overdose (94.2%). Attempted suicide ideation was more common in males and in patients with previous attempts, and were also more related to sequels. Moreover, patients with an overdose were associated with psychiatric history and clinical toxicity. CONCLUSIONS Patients with any of the following characteristics; male, psychiatric history, a history of previous suicide attempts and/or clinical toxicity at the time of the visit in the emergency center, were more associated suicidal ideation before the attempt. Therefore, they had greater severity and risk repeating the attempt. They require a careful psychiatric evaluation and close monitoring.