A multiple dose injection device comprising: a barrel having a bore, a distal end, and a proximal end wherein a fluid conduit is located at the distal end of the barrel, in fluid communication with the bore and the proximal end of the barrel is adapted to receive a stopper; a plunger having a distal end and a proximal end and a longitudinal axis wherein the stopper is connected to the distal end of the plunger and movable within the barrel, and the plunger has at least one continuous track formed between the distal and proximal ends of the plunger, characterized in that the at least one continuous track comprises: a first rest portion comprising a detent tab which provides resistance to movement of a follower moving along the track, a stop portion comprising a proximal abutting wall which prevents distal movement of the plunger, a second rest portion comprising another detent tab which provides resistance to movement of the follower, a camming portion comprising an angled wall which is skewed to the longitudinal axis of the plunger and formed between the first rest portion and the stop portion; a reset portion comprising a portion of track substantially perpendicular to the axis of the plunger and formed between the stop portion and the second rest portion; and a slider comprising the follower, the slider being movable substantially perpendicular to the axis of the plunger, the slider having a user-pressable portion; wherein when a portion of the plunger is depressed by a user, the follower moves with respect to the plunger from the first rest position along the camming portion as the follower moves along the angled wall of the at least one continuous track, thereby causing radial motion of the follower and movement of the follower to the stop portion, in which distal movement of the plunger is prevented by contact of the follower to the proximal abutting wall, and wherein the user may apply a biasing force to the user-pressable portion of the slider, thereby moving the follower from the stop portion along the reset portion to the second rest portion. a barrel having a bore, a distal end, and a proximal end wherein a fluid conduit is located at the distal end of the barrel, in fluid communication with the bore and the proximal end of the barrel is adapted to receive a stopper; a plunger having a distal end and a proximal end and a longitudinal axis wherein the stopper is connected to the distal end of the plunger and movable within the barrel, and the plunger has at least one continuous track formed between the distal and proximal ends of the plunger, characterized in that the at least one continuous track comprises: a first rest portion comprising a detent tab which provides resistance to movement of a follower moving along the track, a stop portion comprising a proximal abutting wall which prevents distal movement of the plunger, a second rest portion comprising another detent tab which provides resistance to movement of the follower, a camming portion comprising an angled wall which is skewed to the longitudinal axis of the plunger and formed between the first rest portion and the stop portion; a reset portion comprising a portion of track substantially perpendicular to the axis of the plunger and formed between the stop portion and the second rest portion; and a slider comprising the follower, the slider being movable substantially perpendicular to the axis of the plunger, the slider having a user-pressable portion; wherein when a portion of the plunger is depressed by a user, the follower moves with respect to the plunger from the first rest position along the camming portion as the follower moves along the angled wall of the at least one continuous track, thereby causing radial motion of the follower and movement of the follower to the stop portion, in which distal movement of the plunger is prevented by contact of the follower to the proximal abutting wall, and wherein the user may apply a biasing force to the user-pressable portion of the slider, thereby moving the follower from the stop portion along the reset portion to the second rest portion. a first rest portion comprising a detent tab which provides resistance to movement of a follower moving along the track, a stop portion comprising a proximal abutting wall which prevents distal movement of the plunger, a second rest portion comprising another detent tab which provides resistance to movement of the follower, a camming portion comprising an angled wall which is skewed to the longitudinal axis of the plunger and formed between the first rest portion and the stop portion; a reset portion comprising a portion of track substantially perpendicular to the axis of the plunger and formed between the stop portion and the second rest portion; and a slider comprising the follower, the slider being movable substantially perpendicular to the axis of the plunger, the slider having a user-pressable portion; wherein when a portion of the plunger is depressed by a user, the follower moves with respect to the plunger from the first rest position along the camming portion as the follower moves along the angled wall of the at least one continuous track, thereby causing radial motion of the follower and movement of the follower to the stop portion, in which distal movement of the plunger is prevented by contact of the follower to the proximal abutting wall, and wherein the user may apply a biasing force to the user-pressable portion of the slider, thereby moving the follower from the stop portion along the reset portion to the second rest portion.