The invention relates to a transportable therapeutic cartridge, a therapeutic agent robotic mixer and a method for providing therapeutic infusion services. The transportable therapeutic cartridge is configured to be used to manually mix therapeutic agents or to be coupled to a therapeutic agent robotic mixer, such that the robotic mixer can access therapeutic agents disposed in the cartridge and automatically mix therapeutic agents. The cartridge, mixer, and method provide therapeutic infusions in a just-in-time fashion, so as to minimize risk to patients and facility staff while maximizing the use and safety of the therapeutics.