First ... if I'm "saving" the syringe is always labled. And I save it only if I think the original ordered dose won't be enough (or if I'm supposed to be giving to effect (0.5 dilaudid repeat x 4 to pain) And it's only me that will be giving it.
As far as how it works from the Pyxis ... when I pull out the 2 mg dilaudid, I just say "yes" to "am I going to administer all." If I don't use it with that patient, just go back into the pyxis and waste later. We have lock boxes on our nurse's stations where we can keep these syringes as long as they are labled with patient name, drug, dilution/dose ... etc.
And yes, in a code, the drugs are flying, and we have one nurse that draws, another that administers ... but with verbal check as the meds are passed along.