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The blood pressure level and the renin-angiotensin system were investigated in 24 menopausal women (12 normotensive and 12 hypertensive) before, during and after six months of treatment with either oestradiol or trisekvens® (sequential preparation containing oestradiol, oestriol and norethisterone acetate).In the normotensive women no significant alterations in systolic or diastolic blood pressure were found during treatment for six months. In the hypertensive women systolic blood pressure fell significantly during treatment with oestradiol as well as with trisekvens, while diastolic pressure did not change. All individual variations of blood pressure were small.The plasma concentrations of renin, angiotensin II and aldosterone remained unchanged during the treatments. A statistically significant increase in plasma renin substrate concentration was observed in all groups with the exception of the normotensive women treated with oestradiol.Menopausal symptoms in hypertensive women may safely be treated with natural oestrogens on the same indications as used for normotensive women.