Chang TE, Ritchey MD, Park S, et al. - Researchers analyzed insured hypertensive US adults, to define health insurance plan-specific and overall weighted national rates of nonadherence to antihypertensive medications in these individuals in 2015, by utilizing multiple administrative datasets and national survey data. Overall 23.8 million hypertensive adults were analyzed. These people have filled 265.8 million prescriptions for antihypertensive medications. By health insurance plan type, a difference was evident in nonadherence, which was highest for Medicaid members, 55.4%; and lowest for Medicare Part D members, 25.2%. The overall weighted national nonadherence rate was estimated to be 31.0%. They reported greater nonadherence among women vs men, younger vs older adults, fixed-dose combination medication nonusers (31.2%) vs users (29.4%), and by pharmacy outlet type (retail only, 30.7%; any mail order, 19.8%). Nonadherence was observed in nearly one-third (≈16.3 million) of insured US adults with diagnosed hypertension, in 2015, and there were considerable differences. In order to address nonadherence and improve blood pressure control, available evidence-based interventions can be used by public health and healthcare professionals.