Although treatment for hypertension is readily available, poor control
of hypertension is a major health problem frequently manifested in la
te life. Researchers believe that one of the major causes of uncontrol
led hypertension is failure to take medication as directed. In this pr
eliminary study, the medication-taking behaviors of 48 adults diagnose
d with hypertension, ranging in age from 35 to 87, were recorded for 2
months with credit card-sized bar-code scanners. The social-cognitive
model (Park, 1992) for understanding medication adherence, which prop
oses that medication adherence is governed by both beliefs and cogniti
ve factors, was used as a basis for this research. Therefore, measures
of health behaviors, attitudes about health and medication taking, an
d cognitive function were recorded, as well as blood pressure readings
. The main findings were that (a) the oldest-old and groups of middle-
aged adults were the most nonadherent, whereas the young-old were more
likely to adhere than the other age groups; (b) high blood pressure r
eadings predicted adherence to antihypertensive medications; and (c) m
edication beliefs influenced adherence in some situations.