- Meets/has met the TRD criteria, defined as lack of clinically meaningful improvement, as indicated by a Clinical Global Impression-Change (CGI-C) score >= 4 and/or less than or equal to (<=) 25 percent (%) improvement in MADRS total score (lack of tolerability is not an indicator of non-response), with at least 2 different oral antidepressant treatments (of the same class, of a different class, or a combination of antidepressants or antidepressant with adjunctive antipsychotics) in the current episode of depression, prescribed in adequate dosages (as defined in the Massachusetts General Hospital - Antidepressant Treatment Response Questionnaire [MGH ATRQ]) for adequate duration (at least 6 weeks) with adequate treatment adherence assessed by physicians