A Study to Evaluate the Effects of Single-dose Seltorexant on Electrocardiogram Intervals in Healthy Adult Participants

A Randomized, Double-blind, Placebo- and Positive-controlled, Single-dose, 4-way Crossover Study to Evaluate the Effects of Seltorexant (JNJ-42847922) on Electrocardiogram Intervals in Healthy Adult Subjects

The purpose of this study is to assess the effects of single dose seltorexant on QT/QTc intervals and electrocardiogram (ECG) morphology at therapeutic and supratherapeutic exposures in healthy adult participants.

Inclusion Criteria:

• Have signed informed consent form (ICF) indicating they understand the purpose of and procedures required for the study, including the required pharmacogenomic component (which specifies testing of genes predisposing to long or short QT and related cardiac syndromes), and are willing to participate in the study. Consent for sample storage will be obtained in the ICF
• Be Willing to adhere to the prohibitions and restrictions specified in the protocol
• A female participant must be either not of childbearing potential (ie, postmenopausal, permanently sterile) or of childbearing potential and practicing a highly effective method of contraception (failure rate of less than [<]1 percent [%] per year when used consistently and correctly)
• A female participant must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for at least 1 month after the last study drug administration
• A male participant, who is sexually active with a woman of childbearing potential and has not had a vasectomy, must agree to use an adequate contraception method as deemed appropriate by the investigator (eg, vasectomy, double-barrier, partner using effective contraception) and to not donate sperm during the study and for 3 months after receiving the last dose of study drug
• Must have a blood pressure (after the participant is supine for 5 minutes) between 90 and 140 millimeter of mercury (mmHg) systolic, inclusive, and no higher than 90 mmHg diastolic. Heart rate between 45 and 100 beats per minute (bpm), inclusive

Exclusion Criteria:

• Clinically significant abnormal values for hematology, serum chemistry (including thyroid stimulating hormone [TSH] at screening only) or urinalysis at screening or at admission to the study site
• Clinically significant abnormal physical examination, vital signs, or 12-lead electrocardiogram (ECG) at screening or at admission to the study site as deemed appropriate by the investigator
• Received a known inhibitor of CYP3A4 or CYP2C9 activity within 14 days or a period less than 5 times the drugs' half-life; whichever is longer, before the first dose of the study drug is scheduled
• Known allergy to the study drug or any of the excipients of the formulation
• Received an experimental drug or used an experimental medical device within 1 month or within a period less than 10 times the drug's half-life, whichever is longer, before the first dose of the study drug is scheduled
• A woman who is pregnant, breast-feeding, or planning to become pregnant during the study