Mark Mattson, Chief of the Laboratory of Neuroscience at the National Institute on Aging, has explained that pharmaceutical companies can't make money off of healthy people, which is why there is no funding for research. So, it's not really surprising that drug companies would manufacture pills that have negative side effects, because then they can keep us sick.

Arnold Seymour Relman, a Harvard professor of medicine and former Editor-in-Chief of the New England Medical Journal, has also stated:

The medical profession is being bought by the pharmaceutical industry, not only in terms of the practice of medicine, but also in terms of teaching and research. The academic institutions of this country are allowing themselves to be the paid agents of the pharmaceutical industry. I think it's disgraceful. (source)(source)