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A low dose of dienogest (DNG) 1 mg/day is useful for treating dysmenorrhea in young women. However, the effect of DNG on bone turnover during bone growth and formation, rather than at maturity, is currently unknown even at low doses. We investigated change in bone turnover after 3 months of DNG 1 mg/day. This retrospective cohort study included young women aged 10–24 years with dysmenorrhea and irregular menstruation. Gonadotropins and the bone metabolism markers TRACP-5b and BAP were compared before and at 3 months after administration of DNG 1 mg/day. There were no significant changes in TRACP-5b (before, 455.6 ± 323.6 mU/dL; 3 months after, 462.1 ± 346.1 mU/dL), BAP (before, 24.7 ± 19.0 μg/L; 3 months after, 25.2 ± 22.3 μg/L), or the TRACP-5b/BAP ratio (before, 22.1 ± 7.0; 3 months after, 21.5 ± 6.3). Administration of DNG 1 mg/day had no significant effect on bone turnover after 3 months during the bone-growth phase in young women.

Impact of 1.0 mg/Day Dienogest Treatment on Bone Metabolism Markers in Young Women with Dysmenorrhea