Number of Manufacturers and Generic Drug Pricing From 2005 to 2017ByInmaculada Hernandez, PharmD, PhD ,Chester B. Good, MD, MPH,Walid F. Gellad, MD, MPH,Natasha Parekh, MD, MS,Meiqi He, MS,William H. Shrank, MD, MSHSJuly 15th 2019Regardless of the number of manufacturers, generic drug prices presented double-digit average increases from 2012 to 2015.