The Effects of Single Pill Combinations on Adherence and Blood Pressure Control in Hypertensive Patients

Background: Hypertension is the most important risk factor for cardiovascular morbidity and mortality. Blood pressure control rates are as low as 17% to 31% in patients diagnosed with hypertension in high-income countries; control rates are likely poorer in low- to middle- and low-income countries. Blood pressure control rates are as low as 17% to 31% in patients diagnosed with hypertension in high-income countries; control rates are likely poorer in low- to middle- and low- income countries. Overall, 43% to 66% of patients fail to adhere to their prescribed antihypertensive medications, and after 1 year, ≈40% of patients with hypertension may stop their initial drug treatment. Objective: The aim of the study was to evaluate the effects of single pill combination antihypertensive drugs on the adherence to treatment, blood pressure control and cardiovascular events vs. free-combination therapy. Methods: We enrolled 192 adult hypertensive patients not older than 79 years, with untreated or uncontrolled hypertension despite previously receiving free combination antihypertensive therapy, between November 2020 and March 2022. Patients treated with single pill combination (SPC) were compared with an arm of the same size (n = 96) and matched by age and gender who received a standard free combination (FC) antihypertensive therapy. Results: There were significant reductions from baseline to month 6 of follow-up in office SBP in the SPC group vs. reduction in FC group (21.9 vs. 13.1 mmHg; p < 0.0001). There were significant reductions from baseline to month 6 of follow-up in office DBP in the SPC group vs. group with free-combination therapy (13.7 vs. 8.0 mmHg; p < 0.0001). At 6 months, 94 participants (98%) were still prescribed the SPC therapy. At the final 6-month study visit, 84.2% of patients in the SPC therapy group were adherent to the prescribed antihypertensive therapy vs. 52% of patients in the FC group. Target BP values (mean 24h ambulatory systolic/diastolic BP < 130/80 mmHg) were reached by more recipients of SPC than free-combination therapy (78.2% vs. 46.3%, p < 0.05) at month 6 of follow-up. Conclusion: Treatment with single pill combinations (SPC), is the emerging best practice for safe, effective, rapid, and convenient hypertension control. It improves the affordability, adherence and control of arterial hypertension.