Conditions: Bipolar Disorder
Keywords: FK949E Major depressive episode patients
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 431
Healthy volunteers: no

Brief summary:
In period I, the treatment effect of FK949E was compared with that of placebo in a blind manner in bipolar disorder patients with major depressive episodes. In period II, the long-term safety and efficacy of FK949E was evaluated.

Detailed description:
This study consisted of two parts. In Treatment Period I, FK949E or placebo was administered orally in a blind manner to bipolar disorder patients with major depressive episodes, with the aim of evaluating the superiority of FK949E over placebo and the dose response of two doses of FK949E based on changes in Montgomery-Asberg Depression Rating Scale (MADRS) total score. In Treatment Period II, the long-term safety, efficacy and pharmacokinetics of open-label FK949E was evaluated in patients who completed Treatment Period I. An analysis was performed for data in Treatment Period I and another analysis was done for data in combined Treatment Periods I and II.

Arms:
arm 1: Participants who received placebo once daily at bedtime for 8 weeks in Treatment Period I and were evaluated against the transition criteria to transfer to Treatment Period II. If transition criteria were not met, participants underwent to a dose-tapering period (1 week) and a follow-up period (1 week) thereafter. If transition criteria were met, participants went into Treatment Period II. arm 2: After 2 days of up-titration, participants who received FK949E 150 mg once daily at bedtime for 8 weeks in Treatment Period I and were evaluated against the transition criteria to transfer to Treatment Period II. If transition criteria were not met, participants underwent to a dose-tapering period (1 week) and a follow-up period (1 week) thereafter. If transition criteria were met, participants went into Treatment Period II. arm 3: After 4 days of up-titration, participants who received FK949E 300 mg once daily at bedtime for 8 weeks in Treatment Period I and were evaluated against the transition criteria to transfer to Treatment Period II. If transition criteria were not met, participants underwent to a dose-tapering period (1 week) and a follow-up period (1 week) thereafter. If transition criteria were met, participants went into Treatment Period II. arm 4: Participants received placebo administered orally once daily at bedtime for 8 weeks in Treatment Period I. Participants who met the transition criteria continued to Treatment Period II which consisted of a transition period in which participants continued to receive placebo for 4 weeks, followed by a 1-week dose adjustment period, and a treatment period in which participants received either open-label FK949E 150 mg or 300 mg (depending on dose increase or reduction guidelines) administered orally for 39 weeks. Participants underwent a dose-tapering period (1 week) and a follow-up period (1 week) thereafter. arm 5: After 2 days of up-titration, participants received FK949E 150 mg administered orally once daily at bedtime for 8 weeks in Treatment Period I. Participants who met the transition criteria continued to Treatment Period II which consisted of a transition period in which participants continued to receive FK949E 150 mg for 4 weeks followed by a 1-week dose-adjustment period and a treatment period in which participants received either open-label FK949E 150 mg or 300 mg (depending on dose increase or reduction guidelines) administered orally for 39 weeks. Participants underwent a dose-tapering period (1 week) and a follow-up period (1 week) thereafter. arm 6: After 4 days of up-titration, participants received FK949E 300 mg administered orally once daily at bedtime for 8 weeks in Treatment Period I. Participants who met the transition criteria continued to Treatment Period II which consisted of a transition period in which participants continued to receive FK949E 300 mg for 4 weeks followed by a 1-week dose-adjustment period and a treatment period in which participants received either open-label FK949E 150 mg or 300 mg (depending on dose increase or reduction guidelines) administered orally for 39 weeks. Participants underwent a dose-tapering period (1 week) and a follow-up period (1 week) thereafter.

Interventions: intervention 1: FK949E intervention 2: Placebo
Intervention descriptions: intervention 1: Taken by mouth (orally). intervention 2: Taken by mouth (orally).

Protocol document: