A Clinical Pharmacology Study of JNS010 (Paliperidone Palmitate) in Patients With Schizophrenia

This is a multicenter (study conducted at multiple sites), open label (all people know the identity of the intervention), randomized (the study medication is assigned by chance), parallel-group (each group of participants will be treated at the same time) study. Approximately, 60 participants will be enrolled in the study. This study will consist of a screening phase (maximum 14 days), an observation phase (92 days), and a follow-up phase (98 days). Participants will be randomly assigned to treatment group A, B, or C. During the observation phase, participants will receive injections of paliperidone palmitate of concentration ranging from 75 to 150 milligram equivalents in the deltoid muscle or gluteal muscle as applicable on Days 1, 8, 36, and 64 alternating between sides (left/right). Safety evaluations will include assessment of adverse events, clinical laboratory tests, electrocardiogram, vital signs, physical examination, injection site reaction, drug-induced extrapyramidal symptoms scale, and visual analog scale which will be evaluated throughout the study. The total study duration for each participant will be approximately 190 days.

Inclusion criteria

- Participants had to have the capability to provide informed consent in writing to participate in the study

• Participants with a diagnosis of schizophrenia in accordance with the diagnostic criteria for Diagnostic and Statistical Manual of Mental Disorders -IV-TR (DSM-IV-TR)
• Participants whose psychiatric symptom is considered stable by the investigator/subinvestigator at the time of giving informed consent
• Participants with a Positive and Negative Syndrome Scale (PANSS) score of less than or equal to 4 (moderate) in the following 9 items at screening: delusion, conceptual disorganization, hallucinatory behavior, excitement, grandiosity, suspiciousness/persecution, hostility, uncooperativeness, poor impulse control
• Participants with an experience of taking a risperidone formulation or a paliperidone formulation by 8 days before the initial day (Day 1) of the study treatment

Exclusion criteria

- DSM-IV-TR diagnosis other than schizophrenia

• DSM-IV-TR diagnosis of substance-related disorders within 180 days before the date of screening
• At a risk of suicide or other-injurious behavior as considered by the investigator/subinvestigator , and participants with a history of suicide attempts
• Concurrent condition of Parkinson's disease (except for drug-induced extrapyramidal syndrome) - Concurrent condition or history of symptomatic cerebrovascular accident