In today's climate, can you expect a doctor to prescribe an unapproved treatment? If we were talking about an OTC (which we're not), yes the patient would have a choice. With a prescribed medication, however, what is to stop a malpractice suit if it doesn't work? So, while not illegal, non-approved drugs, while they may be effective in treatment, don't stand much of a chance. This is only my opinion - I do not agree with it, but it is how I see it.