A drug delivery system is disclosed which may be a throwaway or reusable device for delivery at least one drug to a patient. Also described is a method for administering a drug using said device and a packaged drug for use with said device. The drug delivery device (10) comprises a housing (12), a means (14) for generating a force capable of pushing a drug (16) from a packaging (18) into a human or animal body, a means (20) for transmitting said force to push the drug (16) from the packaging (18) into the human and animal body, and a means (38, 42b) for triggering the device. Where the device is a single use drug delivery system, a packaged drug (100) forms an integral part of the device. The packaged drug comprises a region (102) allowing it to be slidably mounted to the drug delivery device (10).