Internet-administered Interpersonal Psychotherapy for Depressive Symptoms

Inclusion Criteria: * A diagnosis of Major depressive disorder (as indicated by the MINI 7.0 Neuropsychiatric interview) and/or depressive symptoms equal to or more severe than mild depression on the MADRS-S (equal to or above 13 points) and/or BDI (equal to or above 14 points). * Age of at least 18 years old. * Adequate ability to speak, write, and read Swedish. * Internet access for the duration of the study. Exclusion Criteria: * Ongoing substance abuse. * Suicidal plans. * A diagnosed personality syndrome (as diagnosed before the study by a licensed psychiatric healthcare professional). * Other ongoing psychological treatment. * Other severe psychiatric comorbidity that requires specialized care (e.g. anorexia nervosa, psychosis). * Recent changes in psychotropic medication or planned changes during the initial treatment period.