The ties between drug companies and patient groups

A Lipitor bottle and pills.
Pfizer, which makes Lipitor, donated $29 million to patient groups in 2015. Photo: Scott Olson / Getty Images

The largest pharmaceutical companies donated almost twice as much money to patient advocacy groups in 2015 as they spent on federal lobbying, according to a Kaiser Health News investigation.

The big picture: Critics say drug company money could skew the views and priorities of patient groups, many of which have been silent on rising drug prices.

Go deeper: The Kaiser Health News database of drug companies funding patient groups.