At a glance
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A Phase III, Multicenter, Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study to Evaluate the Safety and Efficacy of MK-4305 in Patients With Primary Insomnia - Study A
In Brief
A Phase 3 clinical trial evaluating Suvorexant High Dose (HD), Suvorexant Low Dose (LD), and 1 other intervention for Primary Insomnia. Completed, enrolled 1,023 participants.
Detailed Summary
This is a multicenter study to test the hypothesis that suvorexant (MK-4305) is superior to placebo in improving insomnia as measured by change from baseline in: subjective total sleep time and time to sleep onset, wake time after persistent sleep onset, and latency to onset of persistent sleep. Participants who complete the initial 3-month Treatment (TRT) Phase may participate in an optional 3-month Extension (EXT) Phase.
Study Details
Timeline
Interventions
Suvorexant 40 mg + placebo matching suvorexant 20 mg for participants \<65 years old; Suvorexant 30 mg + placebo matching suvorexant 15 mg for participants ≥65 years old; all study drug is tablet for oral administration, taken once daily at bedtime. Participants receive this dose during the 3-month TRT Phase and, if applicable, the optional 3-month EXT Phase. During the 1-week double-blind (DB) Run-out (RO) following the TRT/EXT phase, participants in this study arm receive the noted suvorexant dose or placebo, in a 1:1 ratio. During the 2-week single-blind Run-in period prior to randomization all participants receive placebo to suvorexant once daily at bedtime.
Suvorexant 20 mg + placebo matching suvorexant 40 mg for participants \<65 years old; Suvorexant 15 mg + placebo matching suvorexant 30 mg for participants ≥65 years old; all study drug is tablet for oral administration, taken once daily at bedtime. Participants receive this dose during the 3-month TRT Phase and, if applicable, the optional 3-month EXT Phase. During the 1-week DB RO following the TRT/EXT phase, participants in this study arm receive the noted suvorexant dose or placebo, in a 1:1 ratio. During the 2-week single-blind Run-in period prior to randomization all participants receive placebo to suvorexant once daily at bedtime.
Matching placebos to suvorexant 40 mg and 20 mg for participants \<65 years old; matching placebos to suvorexant 30 mg and 15 mg for participants ≥65 years old; all study drug is tablet for oral administration, taken once daily at bedtime. Placebo is a third treatment arm for comparison to the two active (suvorexant) treatment arms during the 3-month TRT Phase and, if applicable, the optional 3-month EXT Phase. During the 1-week DB RO following the TRT/EXT phase, participants in this study arm continue to receive placebo. During the 2-week single-blind Run-in period prior to randomization all participants receive placebo to suvorexant once daily at bedtime.