A Phase I, Randomised, Double-Blinded, Placebo-Controlled Study to Evaluate KP405. Part 1: Single Ascending Dosing in Healthy Participants. Part 2: Multiple Ascending Dosing in Healthy Participants and Parkinson's Disease Patients.

Exclusion criteria

• Clinically relevant history of abnormal physical or mental health interfering with the study as determined by medical history and physical examinations obtained during Screening as judged by the Investigator (including \[but not limited to\], neurological, psychiatric, endocrine, cardiovascular, respiratory, gastrointestinal, hepatic, or renal disorder), excluding Parkinson's disease.
• Clinically significant, as judged by the Investigator, neurologic disorder (other than Parkinson's disease) including history of stroke or transient ischaemic attack within 12 months of Screening, cognitive impairment, seizure within 5 years of Screening or head trauma with loss of consciousness within 6 months of Screening.