The present invention relates to a medical delivery apparatus which comprises a hollow container (2) filled with a liquid drug (3). The container (2) is closed at its distal end by a pierceable membrane (4) and provided with a plunger at its proximal open. Whenever a piston rod (20) moves the plunger (5) forward inside the container, a pressure is build up in the liquid drug (3) contained in the container (2). Further, a resilient element (33),such as a spring, is provided. This resilient element (33) can be activated to operate from a relaxed state to a tensed state upon activation of a dose injection mechanism during injection. The resilient element (33) is operated to its tensed state when during injection, the pressure is build up in the liquid drug (3) and secured in its tensed state as long as the pressure inside the container (2) is above a predetermined threshold value. When the pressure in the liquid drug (3) decreases below the predetermined threshold value, the tensed spring will operate into its relaxed state thereby providing an audible and/or tactile indication to the user that the pressure in the liquid drug (3) contained in the container (2) is below the predetermined threshold value.
