A drug delivery device for dispensing of a dose of a medicinal product comprises a housing having a proximal end and a distal end, a container of medicinal product having a piston retained within, and a push-pull element, where the push-pull element is displaceable in proximal direction for setting of a dose and is displaceable in distal direction for dispensing of a dose. The drug delivery device may further include a piston rod coupled with the housing and with the push-pull element and coupling elements for converting a proximal displacement of the push-pull element into a rotational movement of the piston rod and for converting a distal displacement of the push-pull element into an axial movement of the piston rod with respect to the housing.
