“…Other studies utilizing questionnaires and/or single questions to assess adherence have found rates of poor adherence ranging from 76 to 0% [2,3,5,15,16,17]. Studies using objective measures such as not keeping appointments, pill counts, weighing medication, number of medication refills, and electronic caps have reported adherence rates ranging from 28 to 88.3% [6,7,8,18]. Clearly, more study is needed to fully understand adherence rates; however, it seems reasonable for clinicians to expect that approximately half of their patients may fail to follow prescribing instructions.…”