Motor complications include:

• Motor fluctuations — variations or fluctuations in clinical motor response or motor performance.
• Wearing off of the benefit from levodopa usually at the end of the dosing period, before the next dose is due (this is usually predictable).
• On–off phenomenon — rapid and unpredictable fluctuations between 'on' and 'off' periods.
• Dyskinesias — involuntary movements (in response to levodopa or dopamine agonist intake) that may be choreiform (quick, fidgety movements) or dystonic (slow, distorted postures).
• Peak-dose dyskinesia — dyskinesias occurs at peak-dose levels and are typically choreiform, but may involve dystonia or myoclonus.
• Diphasic dyskinesia — dyskinesias occur at the beginning of turning 'on' and/or at the beginning of turning 'off', but they are different, less severe, or absent at the time of peak levodopa effect.
• Off-state dystonia — dystonia when plasma levodopa levels are low.
• Freezing of gait — inability to start or continue walking, characterized by difficulty in stepping forward (at initiation or during walking), inability to lift the foot from the floor, and trembling of the legs.
• Freezing of gait is a common cause of falls, particularly as there is an associated disturbance of balance.
• Freezing of gait occurs during the 'off' phase and, less frequently, in both 'off' and 'on' phases.

[Horstink et al, 2006; Chou, 2008; Dewey, 2008; Okuma and Yanagisawa, 2008]