The current issue of the Journal of the American Medical Association features a study warning against a new generation of "biological" drugs. Nearly 1/4th produce serious side effects that lead to safety warnings soon after they went on the market.
Many thought since these drugs to treat common diseases were made from biological sources they'd be more safe than traditional artificial drugs but that is turning out not to be the case. Side effects include brain infections and cancer.
As more and more evidence piles up is anyone really surprised anymore?
Perhaps it's useful to put it all in historical perspective. It was a little more than 100 years ago that mainstream medicine was treating patients with mercury and other heavy metals as the correct medical treatment of the day. Today we know they were killing people. The more things change, the more they stay the same.