Practical Applications for Single Pill Combinations in the Cardiovascular Continuum

Impact of single-pill combinations versus free-equivalent combinations on adherence and persistence in patients with hypertension and dyslipidemia: a systematic literature review and meta-analysis

OBJECTIVES

Hypertension is a leading cause of death and disease burden followed by dyslipidemia. Their asymptomatic nature leads to low adherence and persistence to treatments. A systematic literature review (SLR) investigated the impact of single-pill-combinations (SPC) compared to free-equivalent combination (FEC) on adherence, persistence, clinical outcomes, healthcare resource utilization (HCRU), and patient-reported outcomes, in patients with hypertension, dyslipidemia, or both.

METHODS

MEDLINE, MEDLINE-IN-PROCESS, Embase, and Cochrane were searched from inception until 11 May 2021, for studies comparing SPC against FEC in patients with hypertension and/or dyslipidemia. Patient characteristics, study design, therapies, measures of adherence or persistence, clinical outcomes, and follow-up were extracted.

RESULTS

Among 52 studies identified in the SLR, 27 (n = 346,030 patients) were included in the meta-analysis. SPCs were associated with significantly improved adherence compared with FEC, as assessed through medication-possession-ratio ≥80% (odds ratio (OR) 0.42, p < 0.01) and proportion of days covered ≥80% (OR 0.45, p < 0.01). SPC also improved persistence (OR 0.44, p < 0.01) and systolic blood pressure (SBP) reduction (mean difference -1.50, p < 0.01) compared with the FEC.

CONCLUSIONS

SPC use resulted in significantly improved adherence, persistence, and SBP levels compared with FEC in patients with hypertension. The findings support SPC use in reducing the burden of hypertension and dyslipidemia.

Design and rationale for a randomized, open-label, parallel clinical trial evaluating major adverse cardiovascular events (pharmacological treatment versus diet control) in patients with high-normal blood pressure: the PRINT-TAHA9 trial

BACKGROUND

The distinction between normal and high blood pressure remains a debated topic, with varying guidelines on when to start medication. Contemporary guidelines advocate for the initiation of antihypertensive therapy in individuals who present with high-normal blood pressure, particularly those exhibiting elevated 10-year atherosclerotic cardiovascular disease (ASCVD) risk scores. Despite these recommendations, there is a notable lack of direct evidence supporting the efficacy of treating high-normal blood pressure to prevent major adverse cardiovascular events (MACE).

METHODS

The PRINT-TAHA9 trial, a unicentric, randomized, open-label, controlled, parallel clinical study, seeks to explore the effects of intensive blood pressure control on MACE in participants with high-normal blood pressure. We will enroll 1620 adults aged 18 years and above with a systolic blood pressure range of 130-140 mmHg, diastolic blood pressure under 90 mmHg, and atherosclerotic cardiovascular disease (ASCVD) risk score exceeding 7.5%. The study will be executed in five distinct phases, with each phase enrolling between 300 and 400 participants. Participants will be randomly assigned to either the treatment group receiving antihypertensive medication (amlodipine/valsartan) and a low-salt/low-fat diet or to the control group receiving a similar diet. Follow-up visits are scheduled every 6 months over a 3-year period to monitor blood pressure, evaluate medication adherence, document any adverse events, and adjust the intervention as necessary. Cox proportional hazards regression analysis will be employed to examine the disparities between the two arms.

DISCUSSION

Despite guidelines promoting early treatment of elevated blood pressure, the debate continues due to insufficient evidence that such interventions significantly reduce the occurrence of MACE. This trial seeks to address this critical evidence gap.

TRIAL REGISTRATION

The PRINT-TAHA9 trial was registered in October 2019 with the Iranian Registry of Clinical Trials (IRCT.ir) under the registration number IRCT20191002044961N1. https://irct.behdasht.gov.ir/trial/43092 .

Metformin-based single pill drug combinations for type 2 diabetes in primary care England: A time trend analysis

AIMS

There has been an increase in prescribing and costs of oral hypoglycaemic agents in England and other countries. This study aims to investigate the trends in prescriptions, costs, and adverse events of metformin and metformin-based single pill drug combinations from 2015 to 2020 and explore why changes in use or cost are occurring.

METHODS

Prescriptions and costs data from Prescription Cost Analysis database and Interactive Drug Analysis Profiles presenting all suspected ADRs reported for each drug were examined. Pharmacy level prices were also obtained. Linear regression analysis was used to investigate the trends in prescribing and costs.

RESULTS

Prescribing and costs of metformin-based single pill drug combinations (as a percent mean change per year) saw an increase of 8.78% (95% Cl: 7.45%, 10.11%, p = 0.001) and 5.17% (95% Cl: 2.13%, 8.22%, p = 0.009) on average each year, respectively. Metformin was the most prescribed monotherapy drug between 2015 and 2020. The cost of prescribing metformin (as a proportion of total oral hypoglycaemic agents) has been reduced from 30% in 2015 to 17% in 2020. Metformin-dipeptidyl peptidase-4 inhibitor (e.g., metformin-sitagliptin) combination was the most popular metformin-based single pill drug combination. The number of adverse drug reactions per million items dispensed shows that metformin has the lowest adverse drug reactions per million items compared to other oral hypoglycaemic drugs.

CONCLUSIONS

Overall, an increase in prescription items can be seen for metformin-based single pill drug combinations along with an increase in their costs in primary care in England between 2015 and 2020. There was a declining trend for the number of ADRs reported per million prescription items dispensed for metformin-containing single pill combinations, even though their prescription rate increased.

Projecting the long-term benefits of single pill combination therapy for patients with hypertension in five countries

OBJECTIVE

To project the 10-year clinical outcomes associated with single pill combination (SPC) therapies compared with multi-pill regimens for the management of hypertension in five countries (Italy, Russia, China, South Korea and Mexico).

METHODS

A microsimulation model was designed to project health outcomes between 2020 and 2030 for populations with hypertension managed according to four different treatment pathways: current treatment practices (CTP), single drug with dosage titration then sequential addition of other agents (start low and go slow, SLGS), free choice combination with multiple pills (FCC) and combination therapy in the form of a single pill (SPC). Model inputs were derived from the Global Burden of Disease 2017 dataset. Simulated outcomes of mortality, chronic kidney disease (CKD), stroke, ischemic heart disease (IHD), and disability-adjusted life years (DALYs) were estimated for 1,000,000 patients on each treatment pathway.

RESULTS

SPC therapy was projected to improve clinical outcomes over SLGS, FCC and CTP in all countries. SPC reduced mortality by 5.4% in Italy, 4.9% in Russia, 4.5% in China, 2.3% in South Korea and 3.6% in Mexico versus CTP and showed greater reductions in mortality than SLGS and FCC. The projected incidence of clinical events was reduced by 11.5% in Italy, 9.2% in Russia, 8.4% in China, 4.9% in South Korea and 6.7% in Mexico for SPC versus CTP.

CONCLUSIONS

Ten-year projections indicated that combination therapies (FCC and SPC) are likely to reduce the burden of hypertension compared with conventional management approaches, with SPC showing the greatest overall benefits due to improved adherence.

Adherence to Single-Pill Versus Free-Equivalent Combination Therapy in Hypertension: A Systematic Review and Meta-Analysis

Poor adherence to antihypertensive therapy is a major cause of poor blood pressure (BP) control in patients with hypertension. Regimen simplification may improve adherence and BP control. This systematic review assessed whether single-pill combination (SPC) therapy led to improved adherence, persistence, and better BP control compared with free-equivalent combination (FEC) therapy in patients with hypertension. PubMed, Medline, Embase, and the Cochrane Library were searched until July 2020, in addition to manual searching of relevant congress abstracts from 2014 to 2020 for studies including adults with hypertension aged ≥18 years receiving SPC or FEC antihypertensive therapy measuring any of the following: adherence, persistence, and reductions in systolic BP and/or diastolic BP. Adherence and persistence were summarized in a narrative analysis; direct pair-wise meta-analysis was conducted to compare BP reductions with SPC therapy versus FEC therapy using fixed-effect and random-effects models. Following screening, 44 studies were included. The majority (18 of 23) of studies measuring adherence showed adherence was significantly improved in patients receiving SPCs versus FECs. Overall, 16 studies measured persistence, of which 14 showed that patients receiving SPCs had significantly improved persistence or were significantly less likely to discontinue therapy than patients receiving FECs. Systolic BP (mean difference, -3.99 [95% CI, -7.92 to -0.07]; P=0.05) and diastolic BP (-1.54 [95% CI, -2.67 to -0.41]; P=0.0076) were both significantly reduced with SPC therapy compared with FEC therapy at week 12. SPC therapy leads to improved adherence and persistence compared with FEC therapy and may lead to better BP control in patients with hypertension.