Combined hormonal oral contraceptives (OCs) may lead to a mild rise in blood pressure and body weight. In rare instances, large increments in blood pressure are measured. We investigated the effect of a combination of ethinyl estradiol (EE) plus a progestogen with antimineralocorticoid, i.e. natriuretic, properties [Drospirenone (DRSP)] on body weight, blood pressure, the renin-aldosterone system, atrial natriuretic factor, plasma lipids, and glucose tolerance. It is anticipated that this will lead to the development of an OC that does not raise body weight or blood pressure. Four groups of 20 women each received 30 micrograms EE plus 3 mg DRSP (group A), 20 micrograms EE plus 3 mg DRSP (group B), 15 micrograms EE plus 3 mg DRSP (group C), and, as a control OC, 30 micrograms EE plus 150 micrograms levonorgestrel (Microgynon, Schering; group D) for 6 months. During the OC-free control cycles before and after treatment and throughout treatment, the target parameters were measured. Between the pretreatment cycle and the sixth treatment cycle, mean body weight fell by 0.8 to 1.7 kg in groups A, B, and C (P < 0.05 vs. D), whereas it rose by 0.7 kg in group D. Systolic and diastolic blood pressures fell by 1-4 mm Hg in groups A, B, and C (significant for A and C vs. D) and increased by 1-2 mm Hg in group D. Renin substrate rose equally in all groups (P < 0.05), whereas PRA and plasma aldosterone rose significantly only in the DRSP groups, presumably due to sodium loss. In the DRSP groups, high density lipoprotein cholesterol rose (P < 0.05), in contrast to group D. Low density lipoprotein cholesterol fell slightly (P > 0.05), whereas triglyceride levels showed a stronger increase in the DRSP groups (P < 0.05) than in group D. All groups attained good cycle control; group A had the best. Side-effects were minimal. To our knowledge, this is the first report on a combined OC that leads to a small decrease in body weight and blood pressure. It may be especially beneficial for women susceptible for a gain in weight and a rise in blood pressure.

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Progesterone has a high affinity for the mineralocorticoid receptor and is an antagonist of aldosterone. Almost all synthetic progestogens are devoid of an antimineralocorticoid effect, and are unable to antagonize the salt-retaining effect of estrogens. This property could be one cause of the weight gain and increase in blood pressure associated with the use of combined oral contraceptives and, in some susceptible women, with postmenopausal hormone replacement therapy (HRT). This review illustrates the results of clinical studies with drospirenone, a new progestogen with antialdosterone activity. In normally menstruating women, 3 mg drospirenone per day, taken from day 5 to day 25 of the cycle, inhibits ovulation. A combination of 3 mg drospirenone with 30 microg ethinylestradiol (Yasmin, Schering AG, Berlin, Germany) is a highly effective and well-tolerated oral contraceptive, with an overall Pearl Index of 0.57 and an adjusted Pearl Index of 0.09. In addition, this combination leads to mild natriuresis and a slight compensatory activation of the renin-aldosterone system. This effect hasbeen clinically demonstrated: compared with an oral contraceptive containing 30 microg ethinylestradiol and 150 microg levonorgestrel, 30 microg ethinylestradiol/3 mg drospirenone, given over 6 months, led to slight decreases in body weight and blood pressure. For postmenopausal HRT, 2 mg drospirenone was combined with 1 mg 17beta-estradiol (Angeliq, Schering AG, Berlin, Germany) for continuous treatment. To evaluate the endometrial safety of this combination, data were assessed from 520 postmenopausal women receiving 1 mg 17beta-estradiol and drospirenone (1, 2 or 3 mg per day) for at least 100 weeks. There were no cases of hyperplasia or carcinoma during the entire study period, and 85-92% of women had an atrophic/inactive endometrium. Data from two studies, with a treatment duration of at least 6 months, demonstrated a decrease in mean systolic blood pressure of 1.8 mmHg and a decrease in mean diastolic blood pressure of 3.8 mmHg, after treatment with 1 mg 17beta-estradiol/2 mg drospirenonefor 28 weeks. However, in a subgroup of slightly hypertensive women (initial blood pressure of more than 140/90 mmHg), the mean decrease in systolic blood pressure after 28 weeks of treatment with 1 mg 17beta-estradiol/2 mg drospirenone was 12.5 mmHg, and the mean decrease in diastolic blood pressure was 9.4 mmHg. Since high blood pressure is a cardiovascular risk factor, the use of drospirenone may exert a beneficial effect in this regard. More prolonged studies need to be performed, in order to demonstrate whether negative cardiovascular end-points can be reduced by the new progestogen. In conclusion, drospirenone is not only a safe option for women using oral contraceptives or HRT, but it may offer new medical benefits, via its antimineralocorticoid and antialdosterone effects and its potential to decrease water retention and blood pressure.

11beta-hydroxysteroid dehydrogenase type 2 (11beta-HSD2) plays a crucial role in converting hormonally active cortisol into inactive cortisone, conferring specificity onto the human mineralocorticoid receptor (MR). Progesterone binds with even higher affinity to the MR, but acts as an MR antagonist. How aldosterone is able to keep its function as predominant MR ligand in clinical situations with high progesterone concentrations, such as pregnancy, is not clear. We have shown in vitro that the human kidney possesses an effective enzyme system that metabolizes progesterone to inactive metabolites in a process similar to the inactivation of cortisol by 11beta-HSD2. In studies on patients with adrenal insufficiency, we have shown that the in vivo anti-mineralocorticoid activity of progesterone is diminished by inactivating metabolism of progesterone, local formation of the deoxycorticosterone mineralocorticoid from progesterone, and inhibition of 11beta-HSD2 by progesterone and its metabolites resulting in decreased inactivation of cortisol and hence increased MR binding by cortisol. The enzymes involved in progesterone metabolism are also responsible for the capability of the human kidney to convert pregnenolone to DHEA and androstenedione leading to the formation of active androgens, testosterone and 5alpha-DH-testosterone. Locally produced androgens might be responsible for the observed difference in blood pressure between men and women and higher susceptibility to hypertension in men.