Pharmedium bags have 14 days expiration on them; then subtract the 2-3 days for shipping!! Doesn't leave much time left, which is why we NEVER pull a bag from Pyxis until the exact date it expires.
I have also order from Ameri-dose and have had good service and the dating is MUCH longer, but we have a contract in place with Pharmedium, so will stay with them for now.
Another thing that really has helped is that I set up automatic shipment for the oxytocin bags to be received every Wednesday. I can call in the Friday before to alter that quantity if necessary. Otherwise, I get 6 cases a week.