Rotigotine Versus Placebo to Evaluate the Efficacy on Depressive Symptoms in Idiopathic Parkinson's Disease Patients

Inclusion Criteria: * Male or female subjects ≥ 20 years old * Subjects diagnosed with idiopathic Parkinson's disease (according to the United Kingdom Parkinson's Disease Society Brain Bank Diagnostic Criteria for Parkinson's disease) at modified Hoehn and Yahr Scale stages I-III; do not have motor fluctuations, dyskinesia, and have stable motor symptom at least 4 weeks prior to the Screening Visit as judged by the local investigator * Subject has a Beck Depression Inventory II (BDI-II) score ≥ 16 as evidenced by depression rating scale study in Parkinson's disease (Schrag A et al, 2007) * Subject has a Mini-Mental State Examination (MMSE) score ≥ 24 * If subject is taking Levodopa (L-DOPA) and derivatives, Monoamine Oxidase (MAO) B-inhibitors, anticholinergics agents, Catechol-O-Methyl Transferase (COMT) inhibitor or N-Methyl-D-Aspartate (NMDA) antagonist, he/she must have been on stable dose for at least 28 days prior to the Screening Visit * If subject is taking an antidepressant drug such as selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), bupropion, tricyclic antidepressants (TCAs), he/she must have been on a stable dose for at least 28 days prior to the Screening Visit and be maintained on that dose for the duration of the trial Exclusion Criteria: * Subject has any medical or psychiatric condition (ie, bipolar disorder, dementia, hallucinations or psychosis) that, in the opinion of the investigator, could jeopardize or would compromise the subject's ability to participate in this study * Subject has a lifetime history of suicide attempt (including an active attempt, interrupted attempt, or aborted attempt), or has suicidal ideation in the past 6 months as indicated by a positive response ('Yes') to either Question 4 or Question 5 of the C-SSRS at Screening (Visit 1) * Current psychotherapy or behavior therapy while participating in this study * Subject has received electroconvulsive therapy within 12 weeks of the Screening Visit * Subject who has received dopamine agonists within 28 days of the Screening Visit * Subject who has received neuroleptics, methylphenidate, reserpine, alpha-methyldopa, metoclopramide, levosulpiride or amphetamine derivatives within 28 days of the Screening Visit