The primary objectives of the study are to characterize the pharmacokinetic (PK) profiles of paliperidone in LY03010 P1 and P2 following a single IM injection in schizophrenia patients and to compare the PK of LY03010 P1 and P2 with that of INVEGA SUSTENNA® following a single IM injection of 156 mg dosage level.

This is a randomized, open-label, parallel-group, single-dose study. Patients will undergo screening evaluations to determine eligibility within 28 days prior to study drug administration. About 36 patients will be randomized in a 1:1:1 ratio to 1 of 3 treatment groups. Patients will be admitted to the clinical facility the day before dosing (Day 0) and will be receiving an IM injection of study drug and completing the assigned study activity including PK sample collection on Day 1. Patients will be discharged on Day 2 after PK collection. All patients will return to the clinical site at designated study days for PK sample collections and assigned clinical procedures. End of study evaluation will be completed on Day 120.

Pharmacokinetics of the study medication will be assessed as primary outcome. Participants' safety will be monitored throughout the study.

Inclusion Criteria:

• Male or female ≥18 to ≤65 years of age who meets diagnostic criteria for schizophrenia according to the Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-V) for at least 1 year before screening
• Have been on a stable dose of oral antipsychotic medication(s) other than risperidone, paliperidone, clozapine, ziprasidone, or thioridazine for at least 4 weeks prior to screening
• Clinically stable based on clinical assessments and a Positive and Negative Syndrome Scale (PANSS) total score ≤70 as well as a PANSS HATE (hostility, anxiety, tension and excitement) subtotal score <16 at screening
• Clinical Global Impression-Severity (CGI-S) score of 1 to 4, inclusive
• Body mass index (BMI) ≥17.0 and ≤37kg/m2; body weight ≥50 kg
• Creatinine level within the normal range
• All female patients (childbearing potential and non-childbearing potential) must have a negative pregnancy test result at both screening and baseline.
• Sexually active fertile male patients must be willing to use acceptable contraception methods (such as double barrier methods of a combination of male condom with either cap, diaphragm or sponge with spermicide) from study drug dosing, throughout the study, and for another 80 days after the EOT visit (or at least 200 days after the dose, whichever is longer) if their partners are women of childbearing potential.

Exclusion Criteria:

• Primary and active DSM-V Axis I diagnosis other than schizophrenia

• Patients who meet DSM-V criteria for substance abuse (moderate or severe) with the exception of caffeine or nicotine in the past 6 months prior to screening, or test positive for barbiturate or alcohol at screening or baseline

• Patients who received any of following treatment:

  • Use of oral risperidone or paliperidone within 2 weeks before screening.
  • Use of clozapine, thioridazine or ziprasidone within 4 weeks before screening.
  • Use of 2-week depot formulation of risperidone within 3 months, 1-month depot formulation of risperidone or 9-hydroxy risperidone (INVEGA SUSTENNA) within 1 year,

• Known or suspected hypersensitivity or intolerance of risperidone, paliperidone, or any of their excipients (oral risperidone tolerability test should be completed during the screening period

• QTcF interval greater than 450 msec for males and 470 msec for females or a prior history or presence of circumstances

• Medical history (within 2 years) of clinically significant, gastrointestinal, cardiovascular, cerebrovascular, musculoskeletal, endocrine, hematologic, renal, hepatic, bronchopulmonary, neurologic, immunologic disorders, or drug hypersensitivity which, in the judgement of the Investigator, would interfere with the patient's ability to participate in the study

• History of dementia-related psychosis or Parkinson's Disease