The Impact of Medicare Part D on Medication Treatment of Hypertension

Department of Health Policy and Management, University of Pittsburgh, 130 De Soto Street, Crabtree Hall A664, Pittsburgh, PA 15261, USA.
Health Services Research (Impact Factor: 2.78). 09/2010; 46(1 Pt 1):185-98. DOI: 10.1111/j.1475-6773.2010.01183.x
Source: PubMed


To evaluate Medicare Part D's impact on use of antihypertensive medications among seniors with hypertension.
Medicare-Advantage plan pharmacy data from January 1, 2004 to December 12, 2007 from three groups who before enrolling in Part D had no or limited drug benefits, and a comparison group with stable employer-based coverage.
Pre-post intervention with a comparison group design was used to study likelihood of use, daily counts, and substitutions between angiotensin-converting enzyme inhibitors and angiotensin-II receptor blockers (ARBs).
Antihypertensive use increased most among those without prior drug coverage: likelihood of use increased (odds ratio = 1.40, 95 percent confidence interval [CI] 1.25-1.56), and daily counts increased 0.29 (95 percent CI 0.24-0.33). Proportion using ARBs increased from 40 to 46 percent.
Part D was associated with increased antihypertensive use and use of ARBs over less expensive alternatives.

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