I had heard anecdotal evidence of NPs prescribing unnecessary pharmaceuticals at higher rates than physicians, and doing some review of the literature, it seems that they do. Lots of the research that I found, however, doesn't differentiate between NPs and PAs, but I would venture to guess that due to increased MD/DO supervision of PAs and the emphasis on medicine and basic sciences provided by PA education, PAs have lower prescribing rates than NPs. Nevertheless, more research is necessary here.
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Practitioner Prescribing Habits for Pharyngitis:
Implications for Evaluation and Management
Patients with pharyngitis but negative cultures were treated with antibiotics at higher rates (57% versus 38%) by NPs/PAs versus physicians (MD/DO)
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Differences in antibiotic prescribing among physicians, residents, and nonphysician clinicians
This is just the abstract, as I'm not able to access the full article myself, but, nevertheless, NPs/PAs prescribed antibiotics more often than physicians overall, and more often even when antibiotics are "rarely indicated."
In regards to training, it appears that NPs have less pharmacology training than physician assistants (PA), dentists (DDS/DMD), and physicians (MD/DO, and quite possibly DPM).
Evidence of that dentists and physicians receive more pharmacology training than NPs is provided here: (just an abstract here, you can find the full article elsewhere, I believe)
http://www.eric.ed.gov:80/ERICWebPo...&ERICExtSearch_SearchType_0=no&accno=ED301661
PAs average 78 hours of in-classroom hours of instruction in pharmacology (
http://www.aapa.org/images/stories/Advocacy-issue-briefs/controlledrx.pdf)
The pharmacology training of nurse practitioners seems to be less in hours of instruction than that of their medically-trained equivalent, the PA. I selected the University of Pennsylvania's adult NP program to examine. This program, ranked as the number one adult NP program by US News, a biased and weak ranking, but, still, a ranking, offers one course in pharmacology *"NURS508 - Applied Pharmacology in Nursing Practice."
In terms of hours, let's look at another program. Emory's adult NP program offers 3 credit hours in "Advanced Pharmacology" (
http://www.nursing.emory.edu/nursing/admissions/msn/amsb.shtml). One semester is roughly 14 weeks. 3 credit hours refers to 3 hours of class per week, so this is approximately 42 hours of actual instructional time in pharmacology.
On the other hand, nurses have been demonstrated to be better managers of some chronic conditions. Quite a bit of research demonstrates this for diabetes management. (Example:
http://care.diabetesjournals.org/content/26/8/2281.full Still, in this study, a physician did supervise the nurses managing the cases.)