We always chuck out the vial after sticking it once!! Some medications (like insulin) are dispensed in multi-dose vials. OP, I don't understand why you would need to squirt the medication from the first vial into the second one. Draw it up as if you were drawing up a combo regular/NPH insulin. Draw from the first vial and then draw the remainder from the second vial into the syringe to get your full dose. Feb 5, '13.