I think you misspelled “threatens to give patients enough information to behave like clients hiring an expert for his services”.

Advertising for prescription drugs is only one vehicle of such information, of course, and a very limited one. But this “driving a wedge” phrasing seems to me to imply that the relationship of patient to doctor should be a helpless and uninformed one. Otherwise, why would providing information to the patient damage the relationship? (What next – moves to outlaw websites with unapproved levels of medical information?) Bah.