Concordance Among Three Self-Reported Measures of Medication Adherence and Pharmacy Refill Records

Because of the weak to moderate concordance found among validated measures of adherence, the selection of a useful adherence measure in pharmacy practice is difficult. These findings underscore the difficulty in both assessing patients' medication-taking behavior and assessing and comparing the results of adherence research. The development of valid and reliable measures for easily assessing medication adherence behavior in community pharmacies is needed.