Angiotensin Receptor Blockers on the Formularies of Medicare Drug Plans

BACKGROUND: The presence of angiotensin receptor blockers (ARBs) on the formularies of Medicare Part D prescription drug plans (PDPs) is vitally important to the health of seniors who cannot tolerate angiotensin-converting enzyme (ACE) inhibitors. OBJECTIVE: To determine whether ARBs are present on the formularies of PDPs and how the prescription cost-sharing for ARBs under Part D compares to cost-sharing before Part D. DESIGN/PARTICIPANTS: Cross-sectional analyses of March 2006 Medicare Part D formularies (n = 1,446) and of ARB utilization and cost-sharing for adults over the age of 64 included in the nationally representative Medical Expenditure Panel Survey. MAIN OUTCOME MEASURES: (1) Presence of ARBs on Part D formularies. (2) Average out-of-pocket costs for 30-day supply of ARBs before and after Part D (both in 2006 dollars). RESULTS: All PDP formularies included at least 1 ARB. Most plans covered 2 ARBs (41%) and 35% covered all 7. The average monthly copay for the most commonly used ARB, valsartan, is $28 under part D, $14 before Part D for individuals with prescription coverage, and $53 before Part D for individuals without coverage. CONCLUSIONS: Whereas ARBs are present on all Part D formularies, many seniors will pay more for these drugs under Part D. Any savings in copayments under Part D may be erased by the monthly premium and by more expensive cost-sharing when seniors reach the 'donut hole'. PMC ID: PMC2305745 (August 2007)