Real-life treatment patterns, compliance, persistence, and medication costs in patients with hypertension in Germany

Abstract

Objective:This retrospective patient data analysis was initiated to describe current treatment patterns of patients in Germany with arterial hypertension, with a special focus on compliance, persistence, and medication costs of fixed-dose and unfixed combinations of angiotensin receptor blockers (ARBs), amlodipine (AML) and hydrochlorothiazide (HCT) in Germany.Methods:The study analyzed prescription data collected by general practitioners, using the IMS Disease Analyzer database. The database was searched for patients with the diagnosis hypertension (ICD-10 code I10) and treatment data in the period 09/2009 to 08/2010. Compliance was measured indirectly based on the medication possession ratio (MPR), and persistence was defined as the duration of time from initiation to discontinuation of therapy. Medication costs were assessed from the statutory health insurance perspective in Germany.Results:In the IMS DA 406,888 observable patients in Germany were encoded with the diagnosis I10 essential hypertension. In total, 88,716 patients received prescriptions including ARBs, monotherapy (18.6%) or unfixed combinations with other anti-hypertensives (19.3%). The compliance with fixed-dose combinations of ARB with HCT, either dual or with one other anti-hypertensive drug, was significantly better, compared to unfixed combinations (mean compliance 78.1% for fixed-dose vs 71.5% for unfixed combinations of ARB with HCT, p < 0.0001; mean compliance 79.4% vs 72.0%, p < 0.0001 if an additional anti-hypertensive medication was added). Fixed-dose combinations of ARB with HCT, ARB with AML, dual only or prescribed with another anti-hypertensive medication resulted in a substantial increase of persistence, especially for patients on fixed-dose dual combinations (225.7 vs 163.6 days for ARB with HCT; 232.9 vs 178.4 days for ARB with AML, respectively). Fixed-dose combinations (varying from €1.38 to €2.20 per patient and day) were on average cheaper than unfixed combinations.Limitations:Persistence and compliance could be under- or over-estimated because their assessment was based on prescription information. For two thirds of 69,060 patients, data on compliance and persistence was missing.Conclusion:The study shows considerable variations in ARB treatment patterns among patients, with the majority of patients treated with fixed-dose or semi-fixed combination therapy. Fixed-dose combinations of ARBs with HCT and/or AML seem to result in better compliance and persistence compared to unfixed regimes of these drug classes, leading to reduction in all-cause hospitalizations, emphasizing the benefit and potential cost-savings of using fixed-dose regimes in a real-life general practice setting in Germany.