Inclusion Criteria:

1. 15-item Geriatric Depression Scale (GDS) > or = 5
2. UPDRS Part I Score on Question #3 < or = 2
3. Folsteins Mini-Mental State Examination (MMSE) score > 24
4. Male or female patient with PD (UK PD Brain Bank criteria).
5. Patients diagnosed with idiopathic PD, Stage I-III by the Modified Hoehn and Yahr Scale and optimally controlled PD symptoms .
6. Male or female patients aged 30 - 80 years.
7. Ability to provide written informed consent.
8. Women of childbearing potential must have a negative serum Beta-HCG pregnancy test at the Screening visit unless surgically sterile or last menstruation >or = 12 months prior to signing IC.
9. Women of childbearing potential must be using an accepted contraceptive.
10. Patients who are willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures.

Exclusion Criteria:

1. Previous history of allergic response, lack of efficacy or complications with pramipexole or its excipients.
2. History of suicidal attempts in the last twelve months; presence of suicidal tendencies/potential.
3. Atypical PD syndromes due to drugs, metabolic disorders, encephalitis or degenerative diseases.
4. History of PD stereotactic brain surgery.
5. Surgery within 180 days of randomization that would negatively impact the patients participation in the study.
6. History of active epilepsy within the past year.
7. Current psychotherapy or behavior therapy while participating the trial
8. Symptomatic orthostatic hypotension prior to randomization.
9. Malignant melanoma or history of previously treated malignant melanoma.
10. Patients who have received typical neuroleptics, metoclopramide, alpha methyldopa, methylphenidate, reserpine, selegiline or amphetamine derivatives within the past 6 months.
11. Patients who have received dopamine agonists within the past 30 days
12. Electroconvulsive therapy during the 90 days preceding the screening visit (Visit 1).
13. Patients who are currently lactating.
14. Participation in other investigational drug studies or use of other investigational drugs within the previous 30 days prior to randomization.
15. Any other laboratory assay abnormality, which could interfere with patient participation or interpretation of results, or could increase the risk for the patient
16. Any other clinically significant medical/psychiatric condition, which could interfere with patient participation or interpretation of results, or could increase the risk for the patient