A Study of JNJ-55308942 in the Treatment of Bipolar Depression

Prior treatment

• Received transcranial magnetic stimulation (TMS), any transcranial electrical stimulation, including transcranial direct current stimulation (tDCS), vagal nerve stimulation (VNS) and/or deep brain stimulation (DBS) within 6 weeks prior to randomization
• History of moderate to severe cannabis misuse according to DSM-5 criteria within 6 months before screening

Other illness

• History of malignancy within 5 years before screening (exceptions are squamous and basal cell carcinomas of the skin and carcinoma in situ of the cervix, or malignancy that in the opinion of the investigator is considered cured with minimal risk of recurrence)

Other

• Currently meets the DSM-5 criteria for Manic Episode (ME) on the MINI

• Have a primary diagnostic and statistical manual of mental disorders (5th edition) (DSM-5) diagnosis of bipolar disorder (BD) (Type I or II) without current psychotic features, as confirmed by the mini international neuropsychiatric interview (MINI)
• Medically stable on the basis of physical examination, medical history, and vital signs performed at screening. Any abnormalities must be consistent with the underlying illness in the study population. This determination must be recorded in the participant's source documents and initialed by the investigator
• Have a body mass index (BMI) between 18.0 and 35.0 kilograms per meter square (kg/m\^2) inclusive (BMI = weight/height\^2)
• A woman of childbearing potential (WOCBP) must have a negative highly sensitive serum pregnancy test (beta-human chorionic gonadotropin \[beta-hCG\]) at screening and a negative urine pregnancy test before the first dose of study intervention