Effects of two estradiol/norgestrel combinations on the ovulatory pattern and on sex hormone binding globulin capacity in women around forty years of age
Hagstad, A.; Damber, J.E.; Janson, P.O.; Samsioe, G.; Södergård, R.
Acta Obstetricia et Gynecologica Scandinavica 63(4): 321-324
1984
ISSN/ISBN: 0001-6349 PMID: 6540031 Document Number: 234805
Thirteen women aged 36-46 years (mean 43) who were seeking contraceptive advice, were monitored for 3 months with basal body temperature (BBT) and were then treated for 3 months with CyclabilR (11 tablets of 2 mg estradiol valerate (E2) followed by 10 tablets of 2 mg E2 + 0.5 mg norgestrel). This treatment was immediately followed by another 3 months with CyclabilR + 2 mg E2. BBT revealed a spontaneous ovulatory rate of 89%. Cyclabil reduced the ovulatory rate, as measured with repeated serum progesterone analyses, to 37%, and Cyclabil + 2 mg E2 resulted in a marked reduction in the number of ovulations (3%). Both types of hormonal combination resulted in relatively small changes in Sex Hormone Binding Globulin Capacity. It is concluded that the addition of 2 mg E2 to CyclabilR causes a decrease in ovulation rate to such an extent that women using this combination run a relatively small risk of conceiving. One advantage over contraceptive steroids may be that the present combination contains a natural estrogen at a relatively low concentration.