e medication vial was opened initially. b. write the date and his or her initials on the label when opening the vial. c. draw the entire amount of medication from the vial into the syringe. d. discard the vial and any remaining medication in the vial directly after use. 5. what will the nurse do after opening a multi-dose vial and withdrawing a dose of medication from it? a. discard the unused portion of the medication. b. wipe the entire vial with an antiseptic swab. c. send the unused portion back to the pharmacy.