Patients must give written informed consent prior to any specific study procedures.
Males or females; females of childbearing age who are not currently pregnant must agree to use a medically accepted method of contraception throughout the study.
Age greater than or equal to 25 years.
Patients must be on a maximum dose of dopamine agonist drug (pergolide 4mg/day, pramipexole 4.5 mg/day or ropinirole 24mg/day).
Stable dose of all medications for 4 weeks.
You may not be if
Current hallucinations.
History of disabling hallucinations or hallucinations in past requiring treatment.
Troublesome edema (swelling).
Unstable depression.
Female who is pregnant or lactating.
Use of an investigational drug with in the last 30 days.
