The primary objective of this study is to evaluate the efficacy of TV-44749 in adult patients with schizophrenia. A key secondary objective is to further evaluate the efficacy of TV-44749 based on additional parameters in adult patients with schizophrenia. A secondary objective is to evaluate the safety and tolerability of TV-44749 in adult patients with schizophrenia. Another secondary objective of this study is to evaluate the efficacy of TV-44749 from baseline to endpoint in Period 1 in adult patients with schizophrenia. Total study duration is up to 61 weeks, and treatment duration is up to 56 weeks, with weekly visits during the first 8 weeks and then monthly in-clinic visits with weekly calls during the remainder of the treatment period. Participation requirements include: - Having been diagnosed with schizophrenia for at least 1 year - Experiencing a worsening of your schizophrenia within the last 8 weeks * Please see complete requirements via inclusion and exclusion criteria link