The aim of this study was to characterize the relationships of students of the Faculty of Medical Sciences of UNAN León, with licit and illicit drugs. This was accomplished by means of a traversal, descriptive study carried out in the year 2008 in the City of León, Nicaragua. The SAMSHA (Substance Abuse and Mental Health Services Administration) questionnaire, adapted for the Nicaraguan context, was applied anonymously. The questionnaire was completed by a total of 954 students, between 17 and 35 years old, of both sexes. It was found that 52.6% of the students used alcohol, 25.3% tobacco, 48.7% medication and 2.6% cocaine. It is necessary to develop other studies to guide prevention and intervention in the university context.