This is a randomized, single-dose, open-label, parallel-group study. Patients will undergo the screening evaluations to determine eligibility within 28 days prior to study drug administration. Approximately 80 eligible patients will be randomized in a 1:1:1:1 ratio to 1 of 4 treatment groups.~Patients will be admitted to the clinical facilities the day (Day 0) before dosing, and will be randomized and receive a single dose 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 (Table 1). End of study evaluation will be completed on Day 176 or at early withdrawal.~For patients who have never taken paliperidone or risperidone, tolerability will be tested with oral risperidone (1 mg risperidone taken orally for 3 consecutive days) at Screening approximately 14 days but no less than 9 days prior to dosing.
This is a randomized, single-dose, open-label, parallel-group study. Patients will undergo the screening evaluations to determine eligibility within 28 days prior to study drug administration. Approximately 80 eligible patients will be randomized in a 1:1:1:1 ratio to 1 of 4 treatment groups.