While I ALWAYS say stick with your hospital's P&P, and even unwritten culture, at some facilities it is Okay, and expected to not waste a narcotic until the end of shift at count- or sometimes not even then! Yes, every facility is different. This practice was usually done at small critical access rural hospitals and medical centers.
That said, a few notes:
1. I would NEVER keep the medication in my POCKET until next dose. I would NEVER pocket a NARCOTIC (Just too risky).
2. I DO NOT like this practice. It is TOTALLY based on trust when you come in, and a TB 1ml Syringe is labeled Morphine Sulfate 1mg/mL! First, the vial has slightly over 1mL anyway- so the dose is going to be "off" anyway- or waste is going to be "off."
3. Most of these small facilities had Multidose bottles of Narcotic Containing Cough Medicine, Liquid Lortab Elixer, Belladona Alkaloids, etc. They were constantly and consistently off by 5-10 mL, and that drove me CRAZY. They were double locked in a tackle box in a Locked Refrigerator.
4. I hated the Buccal Oxycodone for Hospice patients that the RRT administered usually by Nebulizer (a local MD's regular order for the Death Respirations that worked well!) She liked for the nurse who had the patient to keep it on their person for fast access on her rounds- NEVER, . . .Sorry! I could just see losing a HUGE MULTIUSE bottle of Oxycodone, or going home with it. And, . . .It's was impossible to measure it! It was done by gtts/mg! I always had a second Nurse witness WITH me that I was giving the RRT 10 Gtts! I just get REAL FREAKED around Narcotics!
You can't be tooooooo careful, and you will NEVER regret being TOTALLY ANAL about Narcotics! and Narcotic Safety!!!