If nurses are routinely going behind your back, it means they don't want to talk with you about their concerns. If this only happens with 1 or 2 nurses then it may be their issue. If the majority of nurses are doing this, then the general consensus is that you are: 1) dangerous and 2) a jerk. In non-emergent situations, a couple of minutes explaining why you want to give drug x or don't want to use drug y can build trust and grease the wheels for non-standard orders in the future. In emergent situations, go back afterwards and discuss the reasoning. An angry nurse is a nurse that can destroy your ability to care for your patients, and there are relatively few things that end up being worth the trade-off.