A study was undertaken to investigate the electroencephalographic changes following the use of steroid contraceptives. 80 women who attended the Family Planning Clinic at Cairo University Hospital who had no gynecological problems premenstrual tension symptoms or neuropsychiatric troubles were given 8 different types of steroid contraceptives. The period of study varied from 12 to 44 months. Before the women began taking the contraceptives EEG recordings were taken. A follow-up EEG was taken when the women stopped the therapy. Abnormalities in the EEGs were found in 48 cases (60%). There were 26 borderline cases (32.5%) 15 mildly pathological cases (18.75%) and 7 moderately pathological cases (8.75%). The mildly the moderately pathological patients were more likely taking estrogenic contraceptives whereas the borderline patients were more frequently taking higher progestogenic contraceptives.