I mean, really, if you go to the doctor and need a medication, don't you pretty much depend on him / her to tell you what to take? I don't think it would even enter my mind to say, "Wait a minute, Doc. Instead of what you are prescribing, how about let me try ___________. I saw this TV ad about it, and think it's the drug for me."
Maybe someone can explain the marketing strategy. I would much rather see these companies save those millions they spend on TV ads -- and lower their prices!
From Rabbi Abraham Heschel, as quoted in Philip Yancey's book, Disappointment with God: "Faith like Job's cannot be shaken because it is the result of having been shaken."