This study is testing a medicine called NBI-1117568 on adults with schizophrenia. Schizophrenia is a mental illness that affects how a person thinks, feels, and behaves. The study will compare the effects of NBI-1117568 to a placebo, which is a harmless pill with no medicine, to see if it helps improve symptoms like behavior and mood.

Key Points:

• The study requires participants to stay in the hospital during the trial.
• Participants must stop taking certain medications before joining.
• Individuals with certain health issues or risks cannot participate.

Participants must have schizophrenia and be experiencing a worsening of symptoms that requires hospitalization. Those with allergies to the study drug, other serious health issues, or a history of substance abuse (except nicotine or caffeine) cannot join. Participants should also not be at risk of harming themselves or others. It’s important to follow all study rules and instructions if you decide to participate. More criteria may apply, so discussing with your doctor is crucial before joining.