The authors studied 286 patients with epilepsy with disease onset past the age of 20 years (176 males, 110 females) from the urban and rural populations. In 57% of cases the aetiology of epilepsy was undetermined. Among the known aetiological factors head trauma accounted for 15.5% of cases, inflammatory processes in the central nervous system for 4.5%, alcoholism for 7%, vascular lesions for 6%, tumours for 5.2%, degenerative and atrophic changes for 1.5%. Over 40% of patients had had attacks for up to 15 years and over 18% for over 20 years. In 80% of cases grand mal seizures occurred, and in 33% of these cases more than 12 attacks occurred annually. Six cases of status epilepticus were observed with 2 deaths. The attacks were precipitated by menstruation, alcohol abuse, infection, stressed, television watching. Among the signs accompanying or following the seizures tongue biting and urination prevailed. Neurological signs were demonstrated in 21% of cases, encephalopathy in 65%, other psychic disturbances in 9.5%. Systematic treatment was received by 75% of the patients (over 80% in urban population), and therapy with multiple drugs was most frequent. Drug-resistant epilepsy was found in 34% of cases. The patients from the rural population had a lower educational level and had more children. About 70% of the patients were in employment.(ABSTRACT TRUNCATED AT 250 WORDS)