Background: Due to the lack of gold standard techniques for adherence measurement, accurate measuring and monitoring of patient medication adherence is a problem that affects the entire world. Adoption of technology for medication adherence monitoring has received recent attention since it allows for the ongoing monitoring of patient behaviour with regard to medication adherence. However, there are differences in the technological characteristics and data collection techniques of the many medication adherence monitoring technologies currently in use, which affects how well they can be used and how well they can perform. Overall, there is a dearth of adequate standards to evaluate medication adherence monitoring technology for the best uptake and application. Objective: In order to encourage technology development and implementation, this study seeks to offer a narrative review of the available medication adherence monitoring systems.