Safety and Antidepressant Effects of Rellidep in Major Depressive Disorder

Inclusion Criteria: * Signed written informed consent obtained. * Males/Females 20-65 years of age who require a new or a new change in their medication treatment for diagnosed major depression. * A clinical diagnosis fulfilling DSM-IVTR criteria for Major Depressive Disorder, single episode or recurrent. * 17-Item Hamilton Depression Rating Scale (HAMD 17-item) total score at baseline of 18 or higher Exclusion Criteria: * Clinical diagnosis of depression other than DSM-IVTR Major Depressive Disorder (single episode/recurrent, e.g. chronic depression and/or refractory depression are excluded). * Judged to be at significant risk for suicide or having a history suggesting significant current potential for self harm. * Antidepressant medication (other than the index antidepressant). * Women who are pregnant or breast-feeding or intending to become pregnant in the next 12 months. * Clinically significant organ system diseases, e.g. cardiovascular, hepatic, renal, endocrine, gastrointestinal, metabolic, or other systemic diseases. * Course of electroconvulsive therapy (ECT) during the observational period. * Suffer from a major neurological condition (i.e., Parkinson's disease, Huntington's disease), cerebrovascular disease (i.e., stroke), metabolic conditions (i.e., Vitamin B12 deficiency), autoimmune conditions (i.e., systematic lupus erythematosus), viral or other infections (i.e., hepatitis, mononucleosis, human immunodeficiency), and cancer. * Current diagnosis of Schizophrenia or other psychotic disorders (including Schizophreniform Disorder, Schizoaffective Disorder, Delusional Disorder, brief psychotic disorders, psychotic disorder due to general medical condition, substance induced psychotic, psychotic disorder not otherwise specified) as defined in the DSM-IV. * (Sub) clinical hypo/hyper thyroidism (e.g. elevated TSH).