• Marcia Vervloet, Annemiek J Linn, Julia C M van Weert, Dinny H de Bakker, Marcel L Bouvy, and Liset van Dijk.
• NIVEL, Netherlands Institute for Health Services Research, Utrecht, The Netherlands. m.vervloet@nivel.nl
• J Am Med Inform Assoc. 2012 Sep 1; 19 (5): 696-704.

BackgroundMany patients experience difficulties in adhering to long-term treatment. Although patients' reasons for not being adherent are diverse, one of the most commonly reported barriers is forgetfulness. Reminding patients to take their medication may provide a solution. Electronic reminders (automatically sent reminders without personal contact between the healthcare provider and patient) are now increasingly being used in the effort to improve adherence.ObjectiveTo examine the effectiveness of interventions using electronic reminders in improving patients' adherence to chronic medication.MethodsA comprehensive literature search was conducted in PubMed, Embase, PsycINFO, CINAHL and Cochrane Central Register of Controlled Trials. Electronic searches were supplemented by manual searching of reference lists and reviews. Two reviewers independently screened all citations. Full text was obtained from selected citations and screened for final inclusion. The methodological quality of studies was assessed.ResultsThirteen studies met the inclusion criteria. Four studies evaluated short message service (SMS) reminders, seven audiovisual reminders from electronic reminder devices (ERD), and two pager messages. Best evidence synthesis revealed evidence for the effectiveness of electronic reminders, provided by eight (four high, four low quality) studies showing significant effects on patients' adherence, seven of which measured short-term effects (follow-up period <6 months). Improved adherence was found in all but one study using SMS reminders, four studies using ERD and one pager intervention. In addition, one high quality study using an ERD found subgroup effects.ConclusionThis review provides evidence for the short-term effectiveness of electronic reminders, especially SMS reminders. However, long-term effects remain unclear.

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