Needle-free injection system comprising needle-free injector sold empty for use in releasing medical drugs via disposable needle-free ampoules for medical drug storage and release, and accessories therefore, namely, dosing aids in the nature of a transporter into which medical drugs cartridges can be fixed, in order to allow a dose-accurate transfer of medical drugs to the empty ampoules, reset box, transporters, adapters for different drug containers; medical apparatus and instruments for the needle-free hypodermic application of topical or parenteral medical drugs sold empty; needle-free medical drug delivery system, namely, needle-free injectors sold empty for medical drugs administered either subcutaneously, intramuscularly or intradermally, disposable needle-free ampoules sold empty, storage and carrying bags and boxes and carrying cases for needle-free injectors; medical fluid transfer couplers and accessories therefore, namely vial adapters, pen adapters, transporter adapters, and luer adapters