Abstract: A multivolume cartridge assembly having two or more internal compartments for storing and administering one or more medicinal compounds. In some embodiments, a second internal volume is positioned in the distal end of the cartridge assembly, and in other embodiments, the second internal volume is positioned in the apical end of the cartridge assembly. In some embodiments, the cartridge is configured to allow for long term storage of two or more medicinal compounds without mixing of the two or more compounds during storage. The cartridge, in some embodiments, utilizes a stopper assembly to create fluid communication between the two or more internal compartments of the cartridge and allow for mixing of the contents of the two or more compartments prior to the administration of those contents to a patient.