Number of manufacturers and generic drug pricing from 2005 to 2017.

ABSTRACT:

Objectives

To evaluate how changes in generic drug prices and the incidence of abrupt price increases varied with the number of manufacturers supplying each drug.

Study design

Analysis of 2005 to 2016 monthly wholesale acquisition costs (WACs) and University of Pittsburgh Medical Center Health Plan counts of pharmacy claims for National Drug Codes (NDCs) for generic drugs.

Methods

Each year, NDCs were categorized according to the number of manufacturers offering each combination of active ingredient and dosage form: 1 to 3, 4 to 7, and more than 7. For every month from January 2006 to January 2017, we estimated the 12-month change in WAC (eg, 12-month change in January 2006 was calculated as the difference in WAC between January 2006 and January 2005, divided by the W

SUBMITTER: Hernandez I 

PROVIDER: S-EPMC6734551 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature