A Prefilled syringe is a Ready-to-administer syringe that is filled and then labelled before it enters the final clinical area where it could be immediately administered without further manipulation.

Ready-to-use: An injectable medicine is Ready-to-use when it requires no further dilution or reconstitution before transfer to an administration device. For example, a liquid with an ampoule, of the required concentration, that only needs to be drawn up into a syringe

Ready-to-administer: An injectable medicine is Ready-to-administer when it requires no further dilution or reconstitution and is presented in the final container or device, ready for administration or connection to a needle or administration set. For example, an infusion in a bag with no additive required.