A Study To Evaluate The Effect Of A Supratherapeutic Dose Of MK-8189 On The QTc Interval In Participants With Schizophrenia (MK-8189-019)

The primary purpose of this study to evaluate the effect of a supratherapeutic dose of 80 mg MK-8189 on the QT interval corrected for heart rate (QTc interval) and to assess the safety and tolerability of multiple once-daily doses of MK-8189 in participants with schizophrenia. The effects of 3 treatment sequences 1) MK-8189 (48 mg \[Day 1\] and 80 mg \[Day2\]); 2) standard image placebo (Day 1) and moxifloxacin 400 mg (Day 2); and 3) MK-8189 placebo (Day 1 and Day 2) were assessed with 5-day washout intervening sequence. Participants received all treatments in a counter-balanced order according to 1 of 6 possible treatment sequences. The primary hypothesis is that the administration of an 80 mg MK-8189 dose on Day 2 does not prolong the QTc interval to a clinically significant degree. Specifically, the true mean difference (MK-8189 - placebo) in QTc change from baseline is less than 10 milliseconds (msec).