A drug delivery device comprises a housing (2) and a mechanical assembly (3) which is at least partially accommodated in the housing (2). The mechanical assembly (3) comprises a predetermined breaking member (13) which is configured to be damaged when being forcefully separated from the housing (2).Un dispositif dadministration de médicaments comprend un corps (2) et un ensemble mécanique (3) qui est au moins partiellement logé dans le corps (2). Lensemble mécanique (3) comprend un élément de rupture prédéterminée (13) qui est conçu pour être endommagé lorsquil séparé de force du corps(2).