A cartridge for containing and dispensing a medicament, the cartridge comprising: a cartridge body having an interior cavity therein; a stopper movably disposed within the interior cavity; a septum disposed at an opposite end of the interior cavity from the stopper for containing a medicament within the interior cavity; and a connector for directly connecting the cartridge body to a dosing mechanism for moving the stopper toward the septum to dispense the medicament; wherein one of the cartridge body and the septum comprises a protrusion extending radially toward the remaining one of the cartridge body and the septum and corresponding to a receiving groove disposed on the remaining one of the cartridge body and the septum for retaining the septum in the cartridge body subsequent to insertion of the septum into the cartridge body, the receiving groove being recessed away from the one of the cartridge body and the septum, characterized in that the connector comprises: a male protrusion disposed on one of the cartridge body and the dosing mechanism; and a corresponding female recess disposed on the remaining one of the cartridge body and the dosing mechanism; wherein one of: the male protrusion comprises a wedge shape for providing a snap fit; the male protrusion comprises a substantially axially aligned linear protrusion, and the female recess comprises one of a substantially axially aligned slot and an L-shaped slot having a substantially axially aligned portion and a radial portion; or the male protrusion comprises at least one male thread, and the female recess comprises at least one female thread. a cartridge body having an interior cavity therein; a stopper movably disposed within the interior cavity; a septum disposed at an opposite end of the interior cavity from the stopper for containing a medicament within the interior cavity; and a connector for directly connecting the cartridge body to a dosing mechanism for moving the stopper toward the septum to dispense the medicament; wherein one of the cartridge body and the septum comprises a protrusion extending radially toward the remaining one of the cartridge body and the septum and corresponding to a receiving groove disposed on the remaining one of the cartridge body and the septum for retaining the septum in the cartridge body subsequent to insertion of the septum into the cartridge body, the receiving groove being recessed away from the one of the cartridge body and the septum, a male protrusion disposed on one of the cartridge body and the dosing mechanism; and a corresponding female recess disposed on the remaining one of the cartridge body and the dosing mechanism; wherein one of: the male protrusion comprises a wedge shape for providing a snap fit; the male protrusion comprises a substantially axially aligned linear protrusion, and the female recess comprises one of a substantially axially aligned slot and an L-shaped slot having a substantially axially aligned portion and a radial portion; or the male protrusion comprises at least one male thread, and the female recess comprises at least one female thread. the male protrusion comprises a wedge shape for providing a snap fit; the male protrusion comprises a substantially axially aligned linear protrusion, and the female recess comprises one of a substantially axially aligned slot and an L-shaped slot having a substantially axially aligned portion and a radial portion; or the male protrusion comprises at least one male thread, and the female recess comprises at least one female thread.