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Adherence and persistence of single-pill ARB/CCB combination therapy compared to multiple-pill ARB/CCB regimens
1MedImpact Healthcare Systems, Inc., San Diego, CA, USA. fzeng@medimpact.com
Current Medical Research and Opinion
|November 12, 2010
Summary
Single-pill combination (SPC) therapy with angiotensin receptor blockers (ARBs)/dihydropyridine calcium channel blockers (CCBs) significantly improved adherence and persistence compared to free combination therapy. Higher copayments were linked to poorer outcomes.
Area of Science:
- Cardiovascular Medicine
- Pharmacology
- Health Services Research
Background:
- Antihypertensive treatment adherence is crucial for managing blood pressure and preventing cardiovascular events.
- Single-pill combination (SPC) therapies aim to simplify medication regimens, potentially improving patient adherence.
- Comparing the adherence and persistence of ARB/CCB SPCs versus free combinations is essential for optimizing treatment strategies.
Purpose of the Study:
- To evaluate the impact of ARB/CCB SPCs on adherence to antihypertensive treatment.
- To compare adherence and persistence between patients using ARB/CCB SPCs and those using free combinations of ARBs and CCBs.
Main Methods:
- Retrospective analysis of pharmacy claims data from a national pharmacy benefit management company.
- Inclusion of patients newly initiated on ARB/CCB treatment between 01/01/2007 and 08/31/2008 with continuous enrollment.
- Propensity score weighting used to balance patient characteristics between SPC and free-combination groups; adherence defined as PDC ≥ 0.80.
Main Results:
- Patients in the ARB/CCB SPC group demonstrated a 90% greater odds of adherence (OR 1.90, p<0.001) compared to the free-combination group.
- The SPC group was less likely to discontinue therapy (HR 0.66, p<0.001), indicating improved persistence.
- Higher copayments ($50+) were associated with worse adherence and persistence compared to lower copayments ($0-$5).
Conclusions:
- ARB/CCB SPC therapy significantly enhances patient adherence and persistence compared to free-combination therapy.
- Simplifying antihypertensive regimens through SPCs can lead to better treatment outcomes.
- Copayment levels represent a significant factor influencing adherence and persistence in antihypertensive treatment.
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