Unfortunatly, whatever is in the media spotlight for the moment...
While the OP has a good topic / thought, your responses can / will be as diffuse as the individuals posting and whatever aspect of nursing they practice in.
In reality, any medication can become controversial. Pharmacology is an ongoing science, and things that were accepted as standard of care, can fall out of favor due to resulted studies. Add to that, any negative and sensational event will make the news, and then that therapy is in the spotlight (see recent events regarding heparin and NICU). Any time you give a medication, it has that possiblity to become "controversial". Include personal, religeous, psychological beliefs (or biases) to that and off you go....