The present invention relates to a drug delivery device that has a housing and a cap. The drug delivery device also has a lock that prevents the cap being fully replaced on the housing after the cap has been removed.L'invention porte sur un dispositif d'administration de médicament qui contient un boîtier, un capuchon et un verrou qui empêche le capuchon d'être complètement replacé sur le boîtier après le retrait du capuchon.