Companies pay doctors millions of dollars to promote not their most innovative or effective drugs, but some of their most unremarkable.
In the last five months of 2013, drug makers spent almost $20 million trying to convince physicians and teaching hospitals to give their freshly-patented drugs to patients, but many of them are near-copies of existing drugs that treat the same conditions.
https://www.businessinsider.com/what-drugs-are-doctors-paid-the-most-to-promote-2015-1?op=1