The authors present a detailed description of transcerebral electrophoresis of L-DOPA conducted in 20 patients aged 9 months to 12 years suffering from a hyperkinetic form of childhood cerebral paralysis. Each patient received 10 sessions. The results of the treatment were assessed by a 5-point score system. Diminution of involuntary movements by 1 point was observed in 1 patient, by 2 points in 10 patients, by 3 points in 7 patients and by 4 points in 1 patient; in one case no positive results were noted. Muscular dystonia and the severity of tonic reflexes decreased in all patients; voluntary movements also improved. Treatment with transcerebral electrophoresis of L-DOPA was well tolerated and was not associated with side-effects.