Embodiments of the present disclosure present systems, methods and devices related to the tracking of drugs injected by injection devices. For example, in some embodiments, a drug dispensing-tracking device for use in combination with a drug-injection device is provided, where the device comprises a sleeve configured to connect with at least one mechanical feature provided on the injection device, a battery, at least one sensor, an electrical circuit for analog or digital short range communication, and a transmission element. In some embodiments, for each injection, the sensor is configured to automatically detect at least one of an auditory signal, movement, and optical signal, and an auditory signal is generated by at least one of the setting of the injection device for dispensing a drug, the dispensing action of the injection device, and the flow of the drug out of the injection device.
