I find it odd that some people equate doctors and pharmacists. They are not the same. This is not only because they have different locations where they provide service, but because one does not equal the other at all.
A physician can and will prescribe medication, this is no surprise to anyone. Their primary function is to examine, diagnose, advise and treat their patients. Often this involves medication. They know what they have prescribed you, and they might even have a good idea of what you might be taking, if you are the type that tells your doctor about every medication that you take (which IMO is never a bad idea).
One can see a dentist, a podiatrist, a gynecologist, a cardiologist, and a GP all in the same day. They don’t know what has been prescribed to you by other people unless you tell them. Of course there is some degree of communication going on, but HIPAA prevents it from being easily available between offices. Still, your GP has a pretty good idea of what you are taking, and what might interact with those meds.
Your local Registered pharmacist is a little different. Some people think that they’re just pill jockeys, filling up bottles all day long. Simply not true. They are highly trained in all of the ways that meds can be metabolized, abused, and interacted with other meds. They can’t prescribe anything, but they can and do recognize potential interactions.
The physician’s job is primarily one of diagnosis, advisement of treatment, and possibly prescription of medication. The Pharmacists job is not only that of dispensation of prescribed meds, but also that of making sure it makes sense in the grand scheme of what the patient is taking.
I’m shooting from the hip as far as some of my characterizations go, but I can sure place a bet. Take 20 uncommon, but proven, drug combinations that should be at least questioned if not refused. My money is on the Pharmacists catching the greater percentage.