Katerina Kassavou1* and Stephen Sutton1 1Department of Public Health and Primary Care, Primary Care Unit, University of Cambridge, United Kingdom The aim of this study was to pretest the acceptability of an Interactive Voice Response (IVR) intervention to support patients with hypertension and/or type 2 diabetes, as an adjunct to primary care. The intervention contains Behaviour Change Techniques to promote medication adherence, and is based on the theoretical framework that distinguish between Intentional Non Adherence (INA) and Non Intentional Non Adherence (NINA). To our knowledge, this is the first study to develop and pretest a theory and evidencebased IVR intervention outside of the US. We developed and pretested the IVR in 13 patients with hypertension and/or type 2 diabetes, recruited from primary care databases and presumed to be nonadherent. Facetoface interviews at patients’ places were conducted, where each patient received IVR messages and asked to provide experiential feedback about the delivery mode and the intervention content. Think aloud protocol was used to assess intervention acceptability and thematic analysis informed the results. Participants gave positive feedback on the IVR as a way to support medication adherence between their primary care consultations. Specifically, participants liked the navigation options, the voice delivering the messages and the voice recognition software. For intervention content, participants preferred messages that were tailored and personalised, and messages that consisted of information about health consequences, action plans and questions to report medication taking. Patients recommended IVR as an acceptable platform to support adherence to medications between primary care consultations. Future studies could usefully test the feasibility of tailored IVR interventions to support medication adherence in the primary care. Conflict of Interest: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.