Cost-effectiveness analysis of antihypertensive triple combination therapy among patients enrolled in a Medicare

Xin Wang1, Hua Chen1, Essien E1

  • 1Department of Pharmaceutical Health Outcomes and Policy, College of Pharmacy, University of Houston, Houston, TX, USA.

Insights

Single pill triple combination therapy for hypertension is cost-effective compared to free-drug regimens, particularly under strict adherence criteria. This approach offers better value in preventing cardiovascular events.

Area of Science:

  • Cardiovascular Medicine
  • Health Economics
  • Pharmacoeconomics

Background:

  • Hypertension management often involves multiple medications, impacting patient adherence and healthcare costs.
  • Triple combination therapy aims to improve blood pressure control and reduce cardiovascular event risk.
  • Fixed-dose single-pill therapies offer potential advantages in adherence and cost-effectiveness over free-drug combinations.

Purpose of the Study:

  • To evaluate the cost-effectiveness of single-pill fixed-dose triple combination therapy versus free-drug triple combination therapy for cardiovascular event prevention in hypertensive patients.
  • To compare health outcomes, measured in Quality-Adjusted Life Years (QALYs), and healthcare costs between the two therapeutic approaches.
  • To determine the Incremental Cost-Effectiveness Ratio (ICER) for single-pill therapy relative to free-drug therapy.

Main Methods:

  • A Markov model with a five-year cycle was employed for the cost-effectiveness analysis.
  • Two decision models were developed, incorporating both strict and relaxed adherence definitions.
  • Quality-Adjusted Life Years (QALYs) and health-care costs were estimated for each treatment strategy.

Main Results:

  • Under strict adherence criteria, single-pill therapy resulted in a QALYs loss of 6.38 and costs of $486,026.20 per patient, versus 8.64 QALYs loss and $406,405.26 for free combination therapy.
  • The ICER for single-pill therapy compared to free combination therapy was $33,826.46 per QALY gained under strict adherence.
  • Under relaxed adherence criteria, the ICER increased to $84,932.26 per QALY gained, with QALYs loss of 8.09 and costs of $493,404.26 for single-pill therapy versus 8.76 QALYs loss and $436,415.14 for free combination therapy.

Conclusions:

  • Single-pill triple combination therapy demonstrated cost-effectiveness compared to free combination therapy when a willingness-to-pay threshold of $50,000 per QALY was applied, specifically under strict adherence criteria.
  • The findings suggest that improved adherence facilitated by single-pill formulations can enhance the economic value of triple therapy in hypertension management.
  • Optimizing adherence through fixed-dose combinations is crucial for achieving favorable cost-effectiveness outcomes in cardiovascular disease prevention.
Abstract

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