This article is a review of randomised controlled trials (RCTs) which examined interventions to prevent or reduce harm from online gambling or electronic gaming machines. The authors identified 18 studies. The majority of studies were found to have some concerns or a high risk of bias. The studies varied in terms of content, setting, participants, and outcome measures. In total, they examined 33 active interventions of five types: limiting gambling access, providing feedback, interventions based on psychotherapy, providing education, and priming people with analytical thinking. However, no conclusion could be made regarding the effects of any intervention type.
