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Antihypertensive therapy among newly treated patients: An analysis of adherence and cost of treatment over years

Authors Degli Esposti L, Saragoni S, Batacchi P, Geppetti P, Buda S, Esposti ED

Published 28 July 2010 Volume 2010:2 Pages 113—120

DOI https://doi.org/10.2147/CEOR.S11933

Review by Single-blind

Peer reviewer comments 3

Luca Degli Esposti1, Stefania Saragoni1, Paolo Batacchi2, Pierangelo Geppetti3, Stefano Buda1, Ezio Degli Esposti4

1CliCon S.r.l., Health, Economics and Outcomes Research, Ravenna; 2Pharmaceutical Policy Department, Local Health Unit of Florence; 3Department of Preclinical and Clinical Pharmacology, University of Florence; 4Outcomes Research Unit, Policlinics Umberto I, Rome, Italy.

Objective: To perform a time-trend analysis of adherence and cost of antihypertensive ­treatment over four years.

Methods: A population-based retrospective cohort study was conducted. We included subjects ≥18 years, and newly treated for hypertension with diuretics, beta-blockers, calcium channel blockers, angiotensin-converting enzyme inhibitors, or angiotensin receptor blockers between 01 January 2004 and 31 December 2007. One-year adherence to antihypertensive therapy was calculated and classified as low, low-intermediate, intermediate, high-intermediate, and high. The direct cost of antihypertensive medications was evaluated.

Results: We included data for a total of 105,512 patients. The number of newly treated subjects decreased from 27,334 in 2004 to 23,812 in 2007, as well as antihypertensive drug therapy cost which decreased from €2,654,166 in 2004 to €2,343,221 in 2007. On the other hand, in the same time frame, the percentage of adherent newly treated subjects increased from 22.9% to 28.0%. Compared with subjects initiated on angiotensin receptor blockers (odds ratio [OR] = 1), the risk of nonadherence was higher in those initiated on angiotensin-converting enzyme inhibitors (OR = 1.19), combination therapy (OR = 1.44), beta-blockers (OR = 1.56), calcium channel blockers (OR = 1.67), and diuretics (OR = 4.28).

Conclusions: The findings of the present study indicate that suboptimal adherence to antihypertensive medication occurs in a substantial proportion of treated patients, and improvements in treatment adherence were obtained but are still unsatisfactory.

Keywords: antihypertensive therapy, adherence, cost, administrative databases.

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