I got a question from a nurse about why the Hospira morphine syringes say "intravenous use only". I told her I know you can give morphine IM and am not aware of a reason why morphine sulfate couldn't be given IM. I was thinking maybe it just says that on this particular product because it is supposed to be used with a carpuject injector that is reusable and that system can only be used as IV. Our nurses just use a separate syringe and draw it up. Any other ideas why it says this on this product? Thanks.