[The clinico-pharmacological characteristics of anteovin]

The results of evaluation of the contraceptive activity of the biphasic oral contraceptive anteovin are presented. 1 package of anteovin consists of 11 white tablets containing 0.05 mg of ethinyl estradiol and 0.05 mg of levonorgestrel and 10 pink tablets of 0.05 mg of ethinyl estradiol and 0.125 mg of levonorgestrel. Anteovin was tested according to the conventional 21-day regimen from day 5 of the cycle for 21 days followed by 1 7-day rest period. Duration of anteovin administration ranged from 1 to 12 cycles. Anteovin was given to 160 women (aged 17 to 40 years old) who had a history of 618 pregnancies (182 ended by term delivery and 436 ended by induced abortion). During anteovin administration none of the women became pregnant. Side effects of anteovin included mild nausea during first several days in 12 women breast tenderness in 4 and menstruation disorders in 8. The mechanism of contraceptive effect of anteovin was associated with ovulation inhibition. The changes in the basal temperature had a monophasic characteristic. Colpocytological examination showed decrease in the karyopyknotic and eosinophilic indices to 4-30%. All estrogen fractions (estrone estradiol and estriol) in the urine showed statistically significant decrease on day 14-16 of the cycle (to 15.8 mcg/day compared with 41.9 mcg/day in controls). The level of pregnanediol in the urine showed a decrease on day 20-23 of the cycle (0.66 mg/day compared with 2.98 mg/day in controls). After 6 months of anteovin administration there was a decrease in the basal and periovulation secretion of follicle-stimulating hormone luteinizing hormone and estradiol.