This study will be conducted in subjects with established Parkinson's disease in 2 parts. Part A will examine the tolerability, safety, and pharmacokinetics of AZ-009 dose escalation ; and Part B will assess the tolerability, safety, pharmacokinetics, and pharmacodynamics of AZ-009 compared with placebo in a crossover design

This study will be conducted in subjects with established Parkinson's disease in 2 parts.

Part A will examine the tolerability, safety, and pharmacokinetics of daily doses of AZ-009 for 5 days followed by 3 doses on each of days 6 and 7 in dose escalation through 3 cohorts

Part B will assess the tolerability, safety, pharmacokinetics, and pharmacodynamics of AZ-009 compared with placebo in subjects with established Parkinson's disease experiencing regular OFF episodes

Inclusion Criteria:

• Healthy adult males and females between 30 and 85 years of age, inclusive at the time of signing the informed consent document with a clinical diagnosis of Parkinson's Disease
• Body weight ≥ 50 kg and BMI within the range of 18 to 32 kg/m2.
• Willing and able to be confined at the clinical research center for the study period and adhere to overall study visit schedule, procedures and other protocol requirements.
• Understand and voluntarily sign an informed consent document prior to any study related assessments/procedures being conducted.

Exclusion Criteria:

• Any significant medical condition, psychiatric illness or history of depression that could, in the investigator's opinion, compromise the subject's safety or interfere with the completion of this protocol.
• History of clinically significant central nervous system, cardiac, pulmonary, metabolic, renal, hepatic, or gastrointestinal conditions including gastric bypass or other weight loss