Here in Germany as a house doctor you only need to know about 2 miracle medicine for all cases in life: Ibuprofen and Paracetamol. I don't remember ever getting anything prescribed without explicitly asking for it. And when I did, once the doctor suggested to increase the dosage if the thing doesn't work (which bears HUGE potential side-effects, which he didn't mention), and the other time I told about a problem, and the other doctor said "oh, it's probably already chronic. Do meditation or something".

If it doesn't help - you send the patient to the specialist and make it someone's else problem. Faking being a doctor in Europe (Germany at least) is probably the easiest job to fake of all.