Abstract: Provided is packaged medicine capable of inhibiting deterioration of electrodes over a long period of time and reliably transmitting a signal after ingestion even when a long period of time has elapsed since production to ingestion. The packaged medicine includes a solid medicine including drug powder and a micro-device, a container provided with a solid medicine accommodating space accommodating the solid medicine therein, and inert gas encapsulated in the solid medicine accommodating space. The micro-device includes two electrodes with mutually different ionization tendencies and a transmitter operable to transmit a signal using electromotive force generated when the electrodes come in contact with electrolyte.