Recent estimates suggest that companies spend over $50,000 per annum per doctors marketing to doctors. This figure could likely be greatly increased if the cost of “scientific” articles were also included in the mix. Doctors in other words are subject to a greater concentration of marketing power than any other group of people on earth. But, just as they know nothing about buying for a third party, so also no doctors are trained to recognize the way companies market to them.
Both doctors and patients fail to realize that doctors are the consumers of medicines and that they consume by putting pills in patients mouths. In so doing they consume without consequences or side effects. Companies fully appreciate this and exploit it. If the patient has a problem, company marketing ensures doctors will have to hand a great deal of evidence suggesting that any problems are part of the patient’s illness rather than a consequence of treatment. Evidence based medicine is deployed to relegate any reports of difficulties from doctors or patients to the status of anecdotes.
From David Healy's post at Mad in America - read more about the evolution of the prescription drug market in America: BarMittzva Romba: Dance of the Sugar Plum Fairies