within recess 19 of packaging 18 other syringe components may be placed in recess 20 of packaging 18 the needle loading assembly may include only a needle support member 7 the sliding support member 4 and the middle support member 6 may be omitted as shown in fig1 the exposed end of the needle 5 may be covered with a needle jacket 17 the other components of the separately assembled drug mixing syringe may be identical to the components of the preassembled drug mixing syringe in their shapes structures sizes and configurations before injection sliding sleeve 2 containing the menstruum bottle 3 and the other parts of the syringe may be removed from packaging 18 and needle jacket 17 may be removed from needle 5 the rear opening of the sliding sleeve 2 may be socketed into i e engaged with or received in as shown in fig1 the front portion of shell 9 the mouth of menstruum bottle 3 may be oriented downward and pressure may be applied to sliding sleeve 2 until the two ends of the needle 5 pierces the rubber stoppers of menstruum bottle 3 and solute bottle 8 the subsequent process of drug mixing and injection may be identical to the operations set forth for the preassembled drug mixing syringe as shown in fig4 after mixing sliding sleeve 2 may be removed from syringe assembly the contents of the.