Effectiveness of smartphone interventions as continuing care for substance use disorders: A systematic review

As a chronic disease with consistent relapse rates, substance use disorders (SUD) require a continuity-of-care approach. Unfortunately, many patients do not have access to continuing care. This systematic review analysed the current scientific knowledge to better understand if app-based smartphone interventions can be an effective alternative. The databases Cochrane Library, PubMed, Web of Science, and PsycINFO were used to find experimental and quasi-experimental studies investigating the effectiveness of a smartphone intervention in individuals who had completed treatment for SUD. After removing duplicates, a total of 1488 studies were screened, with 48 being selected for a full-text review. Four studies met all the criteria, with one other being added by identification through other resources, making a total of 5 studies included in the present review. Out of the four studies using a control group, only one found no significant differences in favour of the experimental group. That study used an active control group and compared the smartphone intervention to its therapeutic group equivalent. There were no significant differences between the two experimental groups. Overall, the results indicate that app-based smartphone interventions can be an effective alternative to traditional forms of continuing care. However, literature is still scarce, and more research needs to be made on this subject. This systematic review is registered at PROSPERO with the identifier [CRD42021272070].