Are you saying youve only been given 2 doses to tide you over till you get you prozinc (meaning first 2 shots) or 2 shots left of a vial your already using. If this is NEW and your trying to regulate, in my opinion, I would not administer the N. The body wouldnt have enough time to get used to it anyways and then youd be starting something new anyways. Its just 2 shots, and with N since its not a long lasting insulin I dont think it would have much of an effect. IF your stating you only have 2 shots LEFT and you've been giving the N then I dont think it could harm anything to give the last 2 shots.