RESUMEN
The experiments on 715 adult non-inbred female rats and 111 Wistar male rats have established that the estrogen 11-nitrate of 3-acetoxy-9 alpha,11 beta-dioxyestra-1,3,5(10)-trien-17-one (11-nitrate of dioxyestron (NDE-As) has an oral contraceptive activity which is equal to ethynylestradiol (EE). A combined 14-day administration of NDE-As with various gestagens produces a higher contraceptive effect that does EE used in combination with the same gestagens. A 30-day use of NDE-As with combined acetomepregenol (AMP) results in a more significant and prolonged secretion of luteinizing hormone than does the EE-AMP combination. Unlike ethynylestradiol, NDE-As has no hypertriglyceridemic effect when given in oral doses of 0.25 and 1.25 mg/kg body weight.