Mindfulness-based cognitive therapy (MBCT), is a recently developed class-based program designed to prevent relapse. A review of four studies its effectiveness suggests that MBCT may have an additive effect when provided with the usual care in patients who have had three or more depressive episodes, although the usual care did not include antidepressant treatment or any psychotherapy, and the improvement observed may have reflected non-specific or placebo effects. This article is a stub, you can help the wiki by editing it and adding accurate information.