Stroke survivors have a nearly 40% risk of recurrent stroke during the first 10 years. Effective secondary stroke prevention strategies are sub-optimally used, and hence, developing interventions to enable healthcare professionals and stroke survivors to manage risk factors more effectively are required. In this paper we describe the usability evaluation of a decision aid designed in collaboration with stakeholders to reduce the risk of a recurrent stroke. The decision aid was found usable and acceptable by both general practitioners and stroke survivors. Concerns and suggestions for improving the decision aid are discussed.