Abstract
Summary
The effect of teriparatide (20 μg/day) on serum calcium was examined in postmenopausal women previously treated with alendronate or raloxifene. Women previously treated with alendronate or raloxifene who added teriparatide or switched to teriparatide did not have clinically meaningful increases in mean predose serum calcium.
Introduction
The effects of a 6-month treatment with teriparatide (20 μg/day; rhPTH(1–34), TPTD) on serum calcium (Ca) was examined in a prospective study of postmenopausal women previously treated with alendronate (70 mg/week or 10 mg/day [ALN] or raloxifene 60 mg/d [RLX]) for ≥18 months.
Methods
Women continued their usual ALN or RLX during a 2-month antiresorptive phase. Women previously treated with ALN were randomized to add TPTD (n = 52) or switch to TPTD (n = 50) and women previously treated with RLX were randomized to add TPTD (n = 47) or switch to TPTD (n = 49). All were to take at least 500 mg/day of elemental Ca and 400–800 IU/day of vitamin D.
Results
Predose mean serum Ca did not significantly change in groups adding TPTD to either RLX or ALN treatment. In patients who switched from RLX or ALN to TPTD, mean serum Ca increased by 0.05 mmol/L and 0.04 mmol/L respectively. Only 1 patient had the predefined calcium endpoint of serum calcium > 2.76 mmol/L (11 mg/dL) at more than one visit.
Conclusions
Women previously treated with ALN or RLX who added TPTD or switched to TPTD did not have clinically meaningful increases in mean predose serum Ca.
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Acknowledgements
We wish to thank Erik Eriksen, Sundeep Khosla, Robert Marcus, and Hunter Heath for their contributions to the design and initiation of the study. We thank David Donley for co-authoring the protocol, Rachel Wagman for assistance with implementing the study and Melinda Rance for assistance in the preparation of the figures.
Funding
Funding was provided by Lilly Research Laboratories, Indianapolis, Indiana, USA.
Conflicts of interest
Robert Wermers has received grant support from Eli Lilly and Company. Felicia Cosman has received consulting fees from Eli Lilly and Company. Li Xie, Emmett Glass, and John Krege are all employees of Eli Lilly and Company.
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Wermers, R.A., Recknor, C.P., Cosman, F. et al. Effects of teriparatide on serum calcium in postmenopausal women with osteoporosis previously treated with raloxifene or alendronate. Osteoporos Int 19, 1055–1065 (2008). https://doi.org/10.1007/s00198-007-0557-z
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DOI: https://doi.org/10.1007/s00198-007-0557-z