Have you asked your RE about this? I thought the prefilled syringe was the standard dose. I'm tiny and for most meds had a really low dose, but with Ganirelix I just used the whole prefilled syringe.
That said, if your dose truly is half of normal, I don't think I would reuse the syringe. If I remember correctly, they come in a sterilized sealed package...so I would be concerned that the medicine is not meant to be kept after being exposed to your body (unlike the Gonal-F pens which are designed for multi-uses). Again, though, this is the type of question you should definitely ask your RE. If s/he is giving you a dose that is different from the standard dose that is available, they should be giving you instructions on how to administer it.
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