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Some observations suggest the existence of clonazepam abuse. The aim of this study was to assess its magnitude in real life by a new method, using a prescription database, and to assess its evolution between 2001 and 2006. Individuals from a region affiliated to the French health reimbursement system, who had a prescription of clonazepam reimbursed between 1 January and 15 February of two selected years were included. Their deliveries were monitored over a 9-month period. After a descriptive analysis, a clustering method illustrated by a factorial analysis was used to identify different subgroups of clonazepam consumers. An increase of 82% in participants who had a delivery of clonazepam between 2001 and 2006 was observed. Using the clustering method, this study identified some deviant participants. This group comprises a higher proportion of males, benzodiazepine users, and buprenorphine users …