en Endocrinology Endocrinology Original Article Original Article <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="color:#0000ff;"><strong><em>Background</em></strong><em>:</em></span> Adherence to treatment is an important factor in the management of diabetic patients. The aim of this study was to examine the psychometric properties of the 8-item Morisky Medication Adherence Scale (MMAS-8) among type 2 diabetes.<br> <span style="color:#0000ff;"><strong><em>Methods</em></strong><em>:</em></span> This study carried out in Family Medicine Clinics (FMCs) in Tabriz, North West of Iran from May to September 2018. A total of 320 patients suffering from Type 2 diabetes were included. Content and face validity of the Persian version of MMAS-8 &lrm; were quantitatively evaluated. The Cronbach&#39;s alpha and intra-class correlation (ICC) were calculated to assess the reliability. Exploratory factor analysis (EFA) was used to assess the construct validity of the questionnaire.<br> <span style="color:#0000ff;"><strong><em>Results</em></strong><em>:</em></span> Content and face validity of the Persian version of MMAS-8 were confirmed. Good internal consistency (Cronbach&rsquo;s a = 0.83) and test&ndash;retest reliability (ICC= 0.87, P<0.001) were found. According to the results of the EFA, Persian version of MMAS-8 among diabetic patients had two dimensions: stopping to take medication due to the forgetfulness and for reasons other than forgetfulness.<br> <span style="color:#0000ff;"><strong><em>Conclusion</em></strong><em>:</em></span> The Persian version of the MMAS-8 is a high valid and reliable questionnaire to screen medication adherence of Persian-speaking patients with diabetes.</span></span> Diabetes Mellitus, Type 2, Iran, Medication adherence, Validation, Questionnaire 77 83 http://caspjim.com/browse.php?a_code=A-10-1615-1&slc_lang=en&sid=1 Delara Laghousi dlaghusi@yahoo.com 100319475328460027355 100319475328460027355 Yes Social Determinant of Health Research Center, Health Management and Safety Promotion Research institute, Tabriz University of Medical Sciences, Tabriz, Iran Fereshteh Rezaie dr.rezaie95547@gmail.com 100319475328460027356 100319475328460027356 No Department of Community and Family Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Mahasti alizadeh Alizadm@yahoo.com 100319475328460027357 100319475328460027357 No Social Determinant of Health Research Center, Health Management and Safety Promotion Research institute, Tabriz University of Medical Sciences, Tabriz, Iran Mohammad Asghari Jafarabadi m.asghari862@gmail.com 100319475328460027358 100319475328460027358 No Departments of Statistics and Epidemiology, Faculty of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran