PF-06669571 In Subjects With Idiopathic Parkinson's Disease

Inclusion Criteria:

- Subjects must have a clinical diagnosis of idiopathic Parkinson's disease and
presence of at least 2 out of 3 cardinal characteristics (tremor, rigidity and/or
bradykinesia).

- Must be Hoehn & Yahr Stage II-III inclusive and experiencing motor fluctuations in
the form of end-of-dose wearing off during the morning hours or early morning
akinesia.

- Subjects should be able to recognize their "wearing off" symptoms and verify that
they usually improve after their next dose of Parkinson's disease medication.
Subjects should be able to recognize drug-induced dyskinesias and verify whether or
not they are troublesome.

Exclusion Criteria:

- History or clinical features consistent with an atypical parkinsonian syndrome, (for
example: ataxia, dystonia, clinically significant orthostatic hypotension.