In France, the Afssaps is the body in charge of the evaluation of pharmacodependance. In order to fulfil its mission, the Afssaps has created a network of 10 Centres for Evaluation and Information on Pharmacodependance (CEIP), coordinated by the Drugs and Psychotropics Unit. Pharmacodependence notifications issued by professionals are collected by each Centre which evaluates them: it is therefore necessary to harmonize case reporting and make it possible to homogeneously evaluate the seriousness of pharmacodependence cases. Nantes CEIP has developed and has been routinely using a tool which evaluates pharmacodependence seriousness by quantifying patient consumption behaviour: the corresponding calculation, interpretation related to 3 patients is presented in this article. The association of clinical data generated by the tool, and official data coming from CEIP's, represents a powerful combination which is now available for pharmacodependence and abuse diagnosis.