“…However, neuropsychiatric side effects, such as depression, cognitive disturbances, anxiety, mania, and psychotic states (1), and more rarely, movement and extrapyramidal disorders, such as chorea, parkinsonism, akathisia, dystonia, and myoclonus, can be observed (2). We report herein choreiform movements associated with the use of PEG-IFN-α 2b in a patient with chronic HCV.…”