Observational, non-interventional, longitudinal, prospective,multicenter, open label (No treatment is involved). 3 assessment will be carried out . The 1st one will be on baseline, the 2sd one after a significant change in pharmacological treatment and 3rd one after a second significant change in pharmacological treatment. If there isn´t any significant change in therapeutic plan a control assessment will be carry out in week 10th and 24th. A significant treatment change is defined as a change in SSRI/SNRI, to add another SSRI/SNRI or a augmentation treatment added to SSRI/SNRI. The primary objective is to describe therapeutical strategies (antidepressant change, association with another antidepressant or association with another treatment) in the management of patients with MDD with incomplete response or intolerance to an antidepressant after a first or a second failure; and when the psychiatrist decide a change of strategy. Secondary objectives include: 1 - To describe the clinic profile of depressive patients with incomplete response or intolerance to an antidepressant after a first or a second failure; 2- To describe the profile of patients based on therapeutic strategies used and number of therapeutic strategies; 4- Evaluate the use of health resource due to lack of fast onset of action, and social cost (productivity, care givers…); 5 - To associate clinical variable with therapeutic action by psychiatrist.

Inclusion Criteria:

• Provision of written inform consent
• Diagnosed of Major Depressive Disorder based on DSM-IV-TR
• Outpatient who has a change in pharmacological therapeutic plan after an incomplete response or intolerance to a treatment with an adequate dosage of an antidepressant (SSRI/NSRI) 5
• Able to understand and to comply with requirements of the study

Exclusion Criteria:

• Mental retardation
• To have been recruited in a clinical trial in the last 4 weeks or to have planned the inclusion in a clinical trial during the follow-up of this study
• MDD secondary to substance abuse or somatic illness
• Actual depressive episode with <4 weeks or >12 months of length
• Current treatment with >1 SSRI/SRNI or previous treatment with >1 SSRI/SRNI, augmentation treatment with SSRI/SRNI, intravenous antidepressant treatment, TMS, ECT or MAO

Outpatient with major depressive disorder, who has a change in pharmacological therapeutic plan after an incomplete response or intolerance to a treatment with an adecuate dosage of an antidepresant (SSRI/NSRI) (20-40 mg fluoxetine, 75-225 mg venlafaxine or equivalent) for at least 6 weeks.