According to the BBC, 9 out of 10 Big Pharma companies do in fact spend more on marketing than on R&D.
The point is, these pharmaceutical companies have a big a influence on doctors and they do not always public’s best interests at heat.

http://www.trueactivist.com/why-do-pharmaceutical-companies-spend-billions-on-marketing-drugs-to-doctors-john-oliver-is-back-to-explain/