Inclusion Criteria:  Between 18 and 65 years-old; To benefit from a medical follow-up in the psychiatric department of an army training hospital; To present a pathology requiring an antidepressant treatment and whose prescription can wait 10 days; To have given written informed consent to participate in the study.  Exclusion Criteria:  To be currently treated with an antidepressant or antidepressant stopped less than 15 days ago; To have one or more contraindication to the introduction of an antidepressant treatment; Pregnancy or breastfeeding; To require a measure of constraint.