I'm glad you posted this. Six and a half years ago, an L&D nurse tried to administer an injection of terbutaline to me, without my consent, while I was sleeping. I had come in to have contractions monitored. The doc ordered terb without checking my history-- I have a congenital heart condition-- and the nurse thought somehow that not waking me up was the best thing to do.
When I flipped out, and yelled at her not to give it to me, she thought I was afraid of the injection, and starting coochie-cooing me like I was a toddler.
It is very likely that my life would have been in danger, had I been given the injection.
It's got serious side effects, and it's always concerned me that they use it so carelessly and casually. I've known women who weren't even dilating or effacing, who were sent home on pumps, "just in case."