Stopper arrangement for a drug delivery device

Stopper arrangement for a drug delivery device, comprising a stopper, a linear actor coupled with one end to the stopper and with an opposite end to a coupling arrangement, wherein the stopper arrangement is configured to be disposed within a container of a drug delivery device, wherein a shape and/or material of the stopper and the coupling arrangement are configured such that a first frictional force between the coupling arrangement and the container is lower than a frictional force between the stopper and the container when the linear actor is contracting and that second frictional force between the coupling arrangement and the container is greater than the frictional force between the stopper and the container when the linear actor is expanding.

Drug delivery device, comprising a container defining a cavity within for retaining a drug, a nozzle arranged at a distal end of the container, wherein the nozzle is in fluid communication with the cavity, wherein a stopper arrangement according to one of the preceding claims is disposed in the container.