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Background: Although studies have documented hospital and surgical service geographic variability, prescription use geographic variability is largely unknown. Opiate pain medications are widely used, particularly because the promulgation of clinical guidelines promoting aggressive pain treatment. This study describes temporal and interstate variability in aggregate prescription opiate medication use within U.S. Medicaid programs. Methods: A dataset of 49 states’ fee-for-service (FFS) Medicaid prescription drug dispensing records from 1996 to 2002 was compiled and used to quantify medication dispensing examining all opiates, controlled release oxycodone, and methadone. The defined daily dose (DDD) per 1000 FFS Medicaid adult enrollees per day was calculated for all opiate medication categories. A market basket of nonpain prescription medications was constructed for comparison. Rates, trends, and the coefficient of variation were determined overall, by year and for each state. Results: From 1996 to 2002, overall use of opiate pain medications increased 309%. The market basket use increased 170%. Total opiate dispensing varied widely from state to state, with a range of 6.9 to 44.1 DDD/1000/d in 1996, and 7.1 to 165.0 DDD/1000/d (a 23-fold difference) in 2002. The coefficient of variation was 49.6 in 2002. Controlled release oxycodone and methadone had a greater rate of increase compared with all opiates. Conclusions: The dispensing of opiate medications in Medicaid programs increased at almost twice the rate of nonpain-related medications during the 7-year study period. Large, unexplained geographic variation in aggregate use exists. The impact of Medicaid cost-containment strategies on utilization and outcomes should be investigated.

Background: State Medicaid programs introduce many types of prescribing restrictions to manage pharmaceutical use and expenditure. Little is known about the differential effect of implementing prior authorization (PA) policies at market entry versus waiting until several years later when prescribing behavior may already be established. Objectives: We sought to examine the impact on overall use of Cox II inhibitors of PA policies implemented at market entry versus at least 2 years after market entry. Research Design: We quantified Cox II inhibitor and nonselective nonsteroidal anti-inflammatory drug (NSAID) utilization for state Medicaid programs from January 1996 to September 2003. We used generalized estimating equations, Tukey's studentized range test and segmented linear regression on state Medicaid programs to determine the significance of changes in medication use. Measures: The primary end point was the number of defined daily doses (DDD) per 1000 population per day. Results: Six states implementing prescribing restrictions for Cox II inhibitors at market entry had the lowest rates of uptake, averaging 10.9 DDD/1000/d. Twelve states adopting restrictions more than 2 years after market entry experienced declines in use from 23.0 DDD/1000/d before to 13.9 DDD/1000/d after the restrictions (P < 0.01). The 17 states that had never restricted access had the highest utilization, averaging 29.0 DDD/1000/d. Conclusion: Implementing prescribing restrictions at market entry of Cox II inhibitors was effective in restricting uptake. Despite the difficulty in changing well-established prescribing patterns, utilization in states implementing policies 2 years after market entry approached that of the early adopting states within 1 year. Clinical outcomes of such policies remain unknown.