mediport/ SCAP/ VAP syringe for IVP

I'm a student and was in clinical yesterday getting a IVP meds ready when an RN said that I must transfer them to a 10mL syringe to use for a dual chamber mediport. I discussed with my clinical instructor and I went ahead and transfered them to the 10mL but niether of us came across any reading about this (she is Dr.) Both of us have about CVCs like PICCs but thought the mediport handled the pressure, especially as many drugs slowly admin. over minutes. Please fill us in! I have been trying to look this up but have found nothing.