Introduction: Numerous randomized controlled trials have been conducted on internet interventions. In addition to the effects observed in these trials immediately after treatment there are several long-term follow-ups. The aim of this talk is to review the long-term effects of internet-delivered CBT (ICBT) with a focus on results at 1-year or later following treatment termination.

Methods: We were able to locate examples of enduring effects for a range of conditions including mood and anxiety disorders and somatic disorders. The longest follow-up period has been five years.

Results: Large within-group effects have been documented in most trials, with effects sizes being moderate to large for anxiety and depression studies.

Discussion: Studies have failed to document how much the treatment is used during the follow-up period and in the case of depression it is unclear if episodes of depression have occured during the period covered. We conclude that the effects of ICBT appear to be enduring but that more research is needed.