The invention is directed to drug delivery device comprising a primary drug delivery assembly (3) with a primary dose dial sleeve (17) and a secondary drug delivery assembly (4) with a secondary drive sleeve (24). For user selection, a selection switch (48) is movable between a first, a second and a third position and a clutch (49) is connected to the selection switch (48) such that movement of the selection switch (48) causes rotation of the clutch (49). A secondary drive sleeve (24) is configured to rotate and to engage the clutch (49), wherein the clutch (49) is configured to transfer rotation to the secondary drive sleeve (24) when the selection switch (48) is moved from the first position into the second position and to disengage from the secondary drive sleeve (24) when the selection switch (48) is moved from the first into the third position.