Ampoules are single dose containers, so they can not be stored for later use once the neck is broken. This is why the manufacturer included a preservative-free diluent.
Thanks Empower!
Had not meant to store an opened ampoule in the fridge, but three syringes filled with 500iu each. Would that work?
I had to dose that 500iu eod instead of 1500iu twice a week to lower E2.