A Study to Evaluate Iloperidone for the Treatment of Parkinson's Disease Psychosis

Inclusion Criteria: * Willing and able to provide consent and willing to complete all aspects of the study. * Male or female patients greater or equal to 65 years of age. * Clinical diagnosis of idiopathic Parkinson's disease with a minimum duration of 1 year * Psychotic symptoms for at least one month and actively experiencing psychotic symptoms each week during the month prior to screening Exclusion Criteria: * History of significant psychotic disorders prior to or concomitantly with the diagnosis of Parkinson's disease including, but not limited to, schizophrenia or bipolar disorder * Current evidence of a serious and or unstable cardiovascular, respiratory, gastrointestinal, renal, hematologic or other medical disorder, including cancer or malignancies, which would affect the patient's ability to participate in the study