Common short-term adverse effects of levodopa are Nausea Vomiting Light-headedness Common long-term adverse effects include Mental and psychiatric abnormalities (eg, delirium with confusion, paranoia, visual hallucinations, punding [complex, repetitive, stereotyped behaviors]) Motor dysfunction (eg, dyskinesias, motor fluctuations) Hallucinations and paranoia occur most often in older patients and in patients who have cognitive impairment or dementia.