The disclosure relates to a drug delivery device for expelling a pre-determined or pre-settable amount of a liquid medicament formulation which improves the stalling behavior and indicates the stalling state to the user. The device comprises:
a medicament reservoir attached to a housing and
an expelling mechanism configured for acting against the medicament reservoir in order to expel a portion of the liquid medicament formulation therefrom, the expelling mechanism comprising an arrangement of a threaded nut in a fixed axial relation to the housing and a lead screw in threaded engagement with the threaded nut, the threaded nut and the lead screw being rotatable relative to each other by a rotational input interface, a mechanical energy reservoir (for storing energy, the stored energy being releasable from the energy reservoir by a rotational interface, a drive train having upstream and downstream interfaces; and a trigger movable relative to the housing.