Nausea; somnolence, dizziness, headache; insomnia, abnormal dreams; constipation, vomiting; fatigue. Parkinson's disease: Dyskinesia. Hallucinations, confusion, behavioural symptoms of impulse control disorders & compulsions; visual impairment, diplopia, blurred vision, reduced visual acuity; hypotension; peripheral oedema; decreased wt & appetite.