A system comprises a drug reservoir and means for expelling drug from the reservoir, the drug expelling means comprising setting means allowing a user to set a drug dose to be expelled from the reservoir, and actuation means for driving or releasing the drug expelling means to expel the set dose amount. The system further comprises a first electronic data processing system adapted to capture and store data representing a property related to the amount of drug expelled from the reservoir by the expelling means, and a second electronic data processing system adapted to receive and store data from an external source, wherein the system is configured to not allow code or data processed by the second electronic data processing system to be processed by the first electronic data processing system.
