Piribedil in Parkinson's syndrome: a clinical study.

The effect of a new dopamine receptor stimulating agent, piribedil (ET 495), was studied in 10 patients with Parkinson's syndrome, who had had no or a poor response to previous L-DOPA treatment, or had displayed marked side effects during L-DOPA administration. Piribedil produced significant improvement of the functions of activity of daily living (ADL), and appeared to have a preferential effect on parkinsonian tremor. However, treatment was difficult to control primarily because of severe psychiatric side effects.