The currently licensed version is provided in the following publication. Of note, Duke University owns the copyright, so a license must be obtained before using the measure. Please contact David Chang Villacrese (firstname.lastname@example.org) at the Duke Office of Licensing and Ventures (https://olv.duke.edu/) to obtain a license.
Voils, C. I., King, H., Thorpe, C. T., Blalock, D. V., Kronish, I., Reeve, B. B., Boatright, C., & Gellad, Z. F. (2019). Content validity and reliability of a self-report measure of medication nonadherence in hepatitis C treatment. Digestive Diseases and Sciences, 64(10), 2784-2797.
Although this paper presents validation in patients with Hepatitis C, the scale was designed to be applied to different populations and/or people with various medical conditions. The Extent of Nonadherence items are universal and can be administered for any medical condition, whereas the Reasons for Nonadherence must be tailored to the medical condition/population of interest (for more information, see How do I tailor the Reasons for Nonadherence scale for my population?) The first version of the scale, with slightly different wording of the Extent of Nonadherence items, has been used in patients with hypertension, dyslipidemia, and type 2 diabetes.
Voils, C. I., King, H. A., Neelon, B., Hoyle, R. H., Reeve, B. B., Maciejewski, M. L., & Yancy Jr., W. S. (2014). Characterizing weekly self-reported antihypertensive medication nonadherence across repeated occasions. Patient Preference and Adherence, 8, 643-650. PMID: 24855340.
Blalock, D., Zullig, L. L., Bosworth, H. B., Taylor, S., & Voils, C. I. (2019). Self-reported medication nonadherence predicts cholesterol values over time. Journal of Psychosomatic Research, 118, 49-55.
Sagalla, N., Yancy Jr., W. S., Edelman, D., Jeffreys, A., Coffman, C. J., Voils, C. I., Alexopoulos, A.-S., Maciejewski, M. L., & Crowley, M. (in press). Factors associated with non-adherence to insulin and non-insulin medications in patients with poorly controlled diabetes. Chronic Illness.