Obsessive-compulsive disorder is a chronic and disabling condition that often proves to be treatment resistant. Of the patients suffering from obsessive-compulsive disorder, 10%-27% may attempt suicide at least once in their life. We report the case of a patient who presented severe obsessive-compulsive disorder symptoms and attempted suicide ingesting 25 tablets of fluoxetine (20 mg). The patient was treated with venlafaxine and agomelatine and showed improvement of obsessive symptoms and suicidal ideation. Future studies are needed to investigate this treatment regime in large cohorts of obsessive-compulsive disorder patients with suicidal ideation.