THE INVENTION REFERS TO A MEDICATION DELIVERY DEVICE (1) COMPRISING : A HOUSING (3) HAVING A PROXIMAL AND A DISTAL END, A MEDICATION RECEPTACLE (2) DESIGNED TO BE ENGAGED WITH THE HOUSING (3), A PISTON ROD (17) WHICH IS MOVEABLE IN A DISTAL DIRECTION FOR MEDICATION DELIVERY AND A DRIVE DEVICE FOR ROTATING THE PISTON ROD IN A FIRST ROTATIONAL DIRECTION AND THEREBY MOVING THE PISTON ROD COMPRISES TWO HEADED SECTIONS (15,16) WHEREIN A FIRST THREADED SECTION (15) IS PROVIDED FOR THREADED ENGAGEMENT WITH A RESET ELEMENT (11) AND A SECOND THREADED SECTION (16) IS PROVIDED FOR THREADED ENGAGEMENT WITH THE DRIVE DEVICE AND WHEREIN THE THREADS IN THE FIRST AND SECOND THREADED SECTIONS (15,16) ARE OPPOSITELY DISPOSED, WHEREIN IN AN OPERATIONAL STATE THE RESET ELEMENT (11) IS PREVENTED FROM ROTATION WITH RESPECT TO THE HOUSING (3), THE PISTON ROD (17) BEING PREVENTED FROM MOVING IN A PROXIMAL DIRECTION, AND IN A RESETTING STATE THE RESET ELEMENT (11) IS ALLOWED TO ROTATE WITH RESPECT TO THE HOUSING (3), THE PISTON ROD (17) BEING PREVENTED FROM MOVING IN A PROXIMAL DIRECTION, AND IN A RESETTING STATE THE RESET ELEMENT (11) IS ALLOWED TO ROTATE WITH RESPECT TO THE HOUSING (3), THE MEDICATION DELIVERY DEVICE BEING RESETTABLE BY ROTATING THE PISTON ROD (17) AND THE RESET ELEMENT (11) IN A SECOND ROTATIONAL DIRECTION AND THEREBY MOVING THE PISTON ROD (17) IN THE PROXIMAL DIRECTION.
