Safety and Tolerability of Oral OPC-34712 as Adjunctive Therapy in Adults With Major Depressive Disorder (the Orion Trial)

To assess the frequency and severity of AEs as the variables of safety and tolerability of brexpiprazole.

The severity of illness for each participant was rated using the CGI-S . On the basis of the investigator answer to the question: "Considering your total clinical experience with this particular population, how mentally ill was the participant at that time?" Response choices included: 0 = not assessed; 1 = normal, not at all ill; 2 = borderline mentally ill; 3 = mildly ill; 4 = moderately ill; 5 = markedly ill; 6 = severely ill; and 7 = among the most extremely ill participants.

The efficacy of trial treatment was rated for each participant using the CGI-I. The investigator rated the participant's total improvement whether or not it was due entirely to drug treatment. All responses were compared to the participant's condition at screening. Response choices included: 0 = not assessed, 1 = very much improved, 2 = much improved, 3 = minimally improved, 4 = no change, 5 = minimally worse, 6 = much worse and 7 = very much worse.

The SDS was a self-rated instrument used to measure the effect of the participant's symptoms on regular life responsibilities. The SDS was a visual analogue scale that used spatio-visual, numeric, and verbal descriptive anchors simultaneously to assess disability across the 3 domains with scores from 0 = not at all, to 10 = extremely.

Scores of 5 and above were associated with significant functional impairment.

The IDS-SR was a 30-item self-report measure used to assess core diagnostic depressive symptoms as well as atypical and melancholic symptom features of MDD. The IDS-SR consists of 30 items, all rated on a 0 to 3 scale with 0 being the "best" rating and 3 being the "worst" rating. The IDS-SR Total Score is the sum of ratings of 28 item scores. The possible IDS-SR Total Score ranges from 0 (best) to 84 (worst).

Under item 9, two sub-items 9A and 9B exist, with possible scores of 1, 2 or 3 for item 9A, and 0 or 1 for item 9B. The scores for these two sub-items are not included in the calculation of the total score. Item 11 or item 12 should be completed but not both, and similarly, item 13 or item 14 should be completed but not both. If the number of items recorded is at least 23 and at most 27, the IDS-SR Total Score will be the mean of the recorded items multiplied by 28 and then rounded to the first decimal place.