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Research Abstracts Online
January 2010 - March 2011

Main TOC

University of Minnesota Twin Cities
College of Pharmacy
Department of Pharmaceutical Care and Health Systems

PI: Stephen Schondelmeyer

Generic Drug Expenditures in Medicaid Programs, 1991-2006

The purpose of this study is to understand generic prescribing and dispensing processes in the Medicaid program and describe the factors that influence dispensing and prescribing generic drugs. The study will determine the net generic rate, generic prescribing rate, and generic dispensing rate. The research will have three market levels of analysis—substitutable, chemical entity, and therapeutic—and explain the significant differences observed. This is a retrospective, cross-sectional time series study. Medicaid State Drug Utilization Data from the Centers for Medicare and Medicaid Service is collected with four observations per year by state from 1991 to 2006, and is complemented with data from other sources.

The objectives of the study are to calculate Medicaid generic prescribing, dispensing, and net generic rate by year at the three different markets levels from 1991 to 2006 by state and for the United States, and to determine the key factors influencing the Medicaid generic trends at the market level across states between 1991 and 2006. The study sample is the entire population of drugs and all states with usable data since 1991 to 2006 in the Medicaid program. The researchers are performing descriptive analysis nationwide and by state. They are using fixed and random effects two-stage least squares regression to analyze the regression models.

Group Members

Serguei Pakhomov, Co-Principal Investigator
Tola Ou-Quinlan, Staff
Daniel Sepulveda, Research Associate