Human Reproduction, Vol. 14, No. 3, 636-641,
March 1999
© 1999 European Society of Human Reproduction and Embryology
Acceptability and patterns of uterine bleeding in sequential trimegestone-based hormone replacement therapy: a dose-ranging study
1 Gynaecology Research Group, Department of Obstetrics and Gynaecology, and 2 Epidemiology, Robert Kilpatrick Clinical Sciences Building, Leicester Royal Infirmary, Leicester LE2 7LX, and Department of Obstetrics and Gynaecology, 3 King's College Hospital, London and 4 Queen's University, Belfast, UK
Trimegestone is a norpregnane progestogen which is being developed in combination with oral oestradiol as postmenopausal hormone replacement therapy (HRT). In this multicentre dose-ranging study using randomized parallel groups, four doses of trimegestone were used to compare data on the patterns of uterine bleeding, the endometrial histology, and the control of menopausal symptoms in 203 women who completed treatment for 6 months. The treatment consisted of micronized oestradiol (2 mg/day) and one of four doses of trimegestone, which was administered sequentially for days 15–28 of the treatment cycle. Higher doses of trimegestone were associated with later onset of bleeding, which was lighter and of shorter duration than that observed with lower doses. The variability of the day of onset of bleeding in individual women was greater when bleeding occurred before the end of the progestogen phase (early bleeders) than when it occurred afterwards (late bleeders). All women enrolled in the study experienced good control of menopausal symptoms, with minimal progestogenic adverse effects, there being no statistically significant difference between the four dose groups.
Key words: bleeding/endometrium/HRT/menopause/trimegestone
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