A medication mixing and injector device comprising: a housing having a plurality of separate and distinct chambers disposed therein, said plurality comprising a first chamber and a second chamber; a first medicament component provided in the first chamber, wherein the first medicament component is provided in liquid form; a second medicament component provided in the second chamber, wherein the second medicament component is provided in dry form; a valve assembly disposed between the first chamber and the second chamber, the valve assembly configured to selectively allow fluid communication between the first chamber and the second chamber; a first displacement mechanism and a second displacement mechanism corresponding to the respective first chamber and second chamber of the plurality of chambers disposed within the housing; a needle assembly being provided about one of the plurality of chambers, the needle assembly further comprising: a septum; a needle being initially separated from the plurality of chambers by the septum, the needle having a proximal end configured to pierce the septum in an actuated state; and a needle carrier, the needle carrier being configured to translate axially with respect to and toward the septum and the plurality of chambers thus enabling the needle to pierce the septum and provide fluid communication from the plurality of chambers through the needle in the actuated state; and an actuation mechanism configured to cause the valve assembly to open, and configured to release energy from a pre-loaded energy source thereof, the pre-loaded energy source being configured to selectively cause the needle to pierce the septum and to drive the first displacement mechanism into the first chamber, thus forcing the first medicament component in liquid form to flow into the second chamber, thereby mixing with the second medicament component in dry form; and a triggering mechanism configured to release additional energy from the pre-loaded energy source to drive the second displacement mechanism into the second chamber, cause fluid communication between the second chamber and the needle assembly and force fluid from the second chamber through the needle assembly. a housing having a plurality of separate and distinct chambers disposed therein, said plurality comprising a first chamber and a second chamber; a first medicament component provided in the first chamber, wherein the first medicament component is provided in liquid form; a second medicament component provided in the second chamber, wherein the second medicament component is provided in dry form; a valve assembly disposed between the first chamber and the second chamber, the valve assembly configured to selectively allow fluid communication between the first chamber and the second chamber; a first displacement mechanism and a second displacement mechanism corresponding to the respective first chamber and second chamber of the plurality of chambers disposed within the housing; a needle assembly being provided about one of the plurality of chambers, the needle assembly further comprising: a septum; a needle being initially separated from the plurality of chambers by the septum, the needle having a proximal end configured to pierce the septum in an actuated state; and a needle carrier, the needle carrier being configured to translate axially with respect to and toward the septum and the plurality of chambers thus enabling the needle to pierce the septum and provide fluid communication from the plurality of chambers through the needle in the actuated state; and a septum; a needle being initially separated from the plurality of chambers by the septum, the needle having a proximal end configured to pierce the septum in an actuated state; and a needle carrier, the needle carrier being configured to translate axially with respect to and toward the septum and the plurality of chambers thus enabling the needle to pierce the septum and provide fluid communication from the plurality of chambers through the needle in the actuated state; and an actuation mechanism configured to cause the valve assembly to open, and configured to release energy from a pre-loaded energy source thereof, the pre-loaded energy source being configured to selectively cause the needle to pierce the septum and to drive the first displacement mechanism into the first chamber, thus forcing the first medicament component in liquid form to flow into the second chamber, thereby mixing with the second medicament component in dry form; and a triggering mechanism configured to release additional energy from the pre-loaded energy source to drive the second displacement mechanism into the second chamber, cause fluid communication between the second chamber and the needle assembly and force fluid from the second chamber through the needle assembly.