FM doctors are not like a GP. Each FM doctor specializes in certain conditions, illnesses. On the ifm.org website when you do a search by city and state, you’ll find a list of doctors and their specialties and other therapies they offer.
I also see my Internal Medicine doctor at least once a year for my annual and tests like mammograms and Dexascans for osteoporosis. But each FM doctor operates as an independent and creates their own practice.
Also, generally, pharmaceuticals aren’t prescribed. My FM doctor prescribes homeopathy treatments, nutritional supplements, nutritional advice as she has a nutritionist on her staff as well as a coach to help learn how tone deal stress (as stress is a huge cause to illness).