An eight-week smartphone intervention showed preliminary benefits for cue-induced craving and cognition. Its engagement data did not establish sustained abstinence or long-term clinical recovery.
Zhang and colleagues randomized 100 community participants with methamphetamine use disorder to a digital-therapeutics group or usual care. The application combined cognitive behavioral therapy, approach-bias modification, cognitive training and contingency management. Usual care involved counseling. This was a human intervention study, with 52 assigned to the app and 48 to usual care; methamphetamine was not administered experimentally.
The paper reported a significant reduction in cue-induced craving and improvement in cognitive function in the digital intervention analyses. It also reported application attrition over time. These are different outcomes: continued application use documents engagement, while a craving scale samples a particular experience. Neither directly counts every episode of methamphetamine use. Because several treatment components were delivered together, the results cannot isolate which component produced a benefit.
The study was not double-blind and response rates in usual care were low. Analyses using imputation address missing observations through assumptions rather than recovering the missing measurements themselves. Although application activity could be monitored longer, formal long-term outcome assessments were unavailable. The authors also lacked additional drug-use outcome measures beyond the reported cue-craving assessment. The appropriate conclusion is feasibility and preliminary benefit as an adjunct to community care. It is not evidence that a phone application alone prevents relapse or replaces individualized treatment. A claim about long-term effectiveness needs follow-up measurements of clinically meaningful outcomes.
See cognitive-task improvements without an attention-bias benefit for a different study and outcome.