The EQ-5D-5L is a generic measure of health status. The EQ-5D-5L is a 5-item questionnaire that assesses 5 domains including mobility, self-care, usual activities, pain/discomfort and anxiety/depression plus a visual analog scale rating "health today" with anchors ranging from 0 (worst imaginable health state) to 100 (best imaginable health state).

An adverse event (AE) is any untoward medical event that occurs in a participant administered an investigational product, and it does not necessarily indicate only events with clear causal relationship with the relevant investigational product. A Serious (AE) is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly.

Health Care Resource Utilization (HCRU) will be measured through the number of hospitalization visits, visits to the emergency department, inpatient hospitalization, specialist outpatient visits, number of day care visits, laboratory tests, instrumental and other diagnostic tests related to MDD with active suicidal ideation with intent.

BHS is paper-based self-reported measure to assess one's level of negative expectations or pessimism regarding future. The scale consists of 20 true-false items that examine the respondent's attitude over past week by either endorsing a pessimistic statement or denying an optimistic statement; 9-items are keyed false and 11 are keyed true. Items fall within 3 domains: feelings about future; loss of motivation; future expectations. Each response is assigned a score of 0 or 1. Total BHS score is sum of item responses, with range from 0 to 20, with a higher score representing higher level of hopelessness. Total scores that range from 0 to 3 are (normal range), scores 4 to 8 (mild hopelessness, scores 9 to 14 (moderate hopelessness), scores <14 (severe hopelessness). Negative change in score indicates improvement.

MADRS is clinician-rated scale designed to measure depression severity, and to detect changes due to antidepressant treatment. MADRS item 10, or MADRS-SI evaluates apparent sadness, reported sadness, inner tension, sleep, appetite, concentration, lassitude, interest level, pessimistic thoughts, and suicidal thoughts; scored from 0 (item is not present or is normal) to 6 (severe or continuous presence of symptoms), summed for a total possible score of 0 to 60. Higher scores represent more severe condition.

The 31-item Involvement Evaluation Questionnaire measures caregiver burden. It has been validated for caregivers of individuals with schizophrenia, covers a broad domain of caregiving consequences and refers to burden experienced within the past 4 weeks. Mean scores are calculated for the total scale and sub-scales. Total scores can range from 29 to 145 with sub-scale domains ranging - tension, 9-45; supervision, 6-30; worrying, 6-30; and urging, 8-40. Lower total and subscale scores indicate less burden and higher scores greater level of caregiver burden.