A drug delivery device (11, 12, 13, 126, 1000 ) comprising: a container containing a drug; a needle unit (50, 132, 300, 400, 500, 600) connected to the container, wherein the needle unit ( 50 , 132, 300, 400, 500, 600) comprises: a holder (310, 410, 510, 610) having a first end (392) and a second end (394) configured to be connected to the container; a first needle support (320, 420, 520, 620) and a second needle support (340, 440, 540, 640) positioned within the holder (310, 410, 510, 610); a first needle (51, 330, 430, 530, 630) connected to the first needle support (320, 420, 520, 620), a second needle (53, 350, 450, 550, 650) connected to the second needle support (340, 440, 540, 640), a movable connector (360, 460, 560, 660) in fluid communication between the first and second needles; and a drive mechanism configured to move the needle unit (50, 132, 300, 400, 500, 600) from a first configuration to a second configuration, wherein in the first configuration, the first needle (51, 330, 430, 530, 630) and the second needle (53, 350, 450, 550, 650) are positioned completely within the holder (310, 410, 510, 610), and in the second configuration, the first needle (51, 330, 430, 530, 630) extends beyond the first end (392) of the holder (310, 410, 510, 610) and the second needle (53, 350, 450, 550, 650) extends beyond the second end of the holder (310, 410, 510, 610), wherein the first end (392) of the holder (310, 410, 510, 610) includes a seal (230) and the container includes a septum (35, 226) proximate the second end of the holder (310, 410, 510, 610), and when switching from the first configuration to the second configuration, the first needle (51, 330, 430, 530, 630) pierces the seal (230) and the second needle (53, 350, 450, 550, 650) pierces the septum (35, 226); and a delivery mechanism connected to the container and configured to direct the medicament through the second needle (53, 350, 450, 550, 650) and the first needle (51, 330, 430, 530, 630) when the needle unit (50, 132, 300, 400, 500, 600) is in the second configuration, in which: the first needle support (320, 420, 520, 620) and the second needle support (340, 440, 540, 640) are positioned along a common plane and are slidably connected to each other through the drive mechanism, and activation of the drive mechanism allows movement of the first needle support (320, 420, 520, 620) and the second needle support (340, 440, 540, 640) so that the needle unit switches to the second configuration. <CLMTXT> 2. The drug delivery device (11, 12, 13, 126, 1000) of claim 1, wherein the container is configured to be detachable from the needle unit (50, 132, 300, 400, 500, 600). <CLMTXT> 3. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1-2, wherein the removable connector (360, 460, 560, 660) is flexible. <CLMTXT> 4. The drug delivery device (11, 12, 13, 126, 1000) of claim 3, wherein the movable connector (360, 460, 560, 660) is a flexible tube <CLMTXT> 5. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 4, wherein the drive mechanism is configured to operate at a plurality of different operating speeds <CLMTXT> 6. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 5, wherein each of the first needle support (320, 420, 520, 620) and the second needle support The needle supports (340, 440, 540, 640) include a rack, and the driving mechanism is a pinion gear configured to movably engage, respectively, with the rack of the first needle support (320, 420, 520, 620) and the second needle support (340, 440, 540, 640). <CLMTXT> 7. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 6, wherein the drive mechanism includes a drive screw threadedly connected to the first needle support (320, 420, 520, 620) and the second needle support (340, 440, 540, 640). <CLMTXT> 8. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 7, wherein the drive mechanism is further configured to move the needle unit (50, 132, 300, 400, 500, 600) from the second configuration back to the first configuration. <CLMTXT> 9. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 8, further comprising an electric motor, the electric motor configured to actuate at least one of the delivery mechanism and the drive mechanism. <CLMTXT> 10. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 9, further comprising a communication device (780) configured to send and receive signals related to the operation of the drug delivery device to and from a computing device <CLMTXT> 11. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 10, wherein during transition of the needle unit (50, 132, 300, 400, 500, 600) from the first configuration to the second configuration, the first needle (51, 330, 430, 530, 630) moves along an axis in a first direction and the second needle (53, 350, 450, 550, 650) moves along an axis in a second direction opposite to the first direction. <CLMTXT> 12. The drug delivery device (11, 12, 13, 126, 1000) of any one of claims 1 - 10, wherein during transition of the needle unit (50, 132, 300, 400, 500, 600) from the first configuration to the second configuration, the first needle (51, 330, 430, 530, 630) moves along an axis in a first direction and the second needle (53, 350, 450, 550, 650) moves along an axis in a second direction, perpendicular to the first direction.