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Background :  Sodium glucose co-transporter type 2 inhibitors (iSGLT2) are antihyperglycemic drugs approved for the treatment of type 2 diabetes mellitus (T2DM). Clinical trials with these drugs have shown evidence of an increased risk of fractures and an effect on phosphorus, vitamin D and parathyroid hormone (PTH) levels.    Aim :  The aim of this study was to investigate the effect of the most selective iSGLT2 empagliflozin on the calcium and phosphorus metabolism in patients with T2DM and preserved kidney function.    Materials and methods  : Thirty-nine T2DM patients were received empagliflozin 10 mg in addition to their antihyperglycemic drugs for 12 weeks. Before starting treatment, a dual-energy X-ray absorptiometry (DXA) with an assessment of the trabecular bone score (TBS) was performed. The concentration of phosphorus (P), total (tCa) and ionized calcium (Ca ++ ), fibroblast growth factor 23 (FGF-23), 25(OH)D and PTH were assessed.    Results :  According to the DXA results, only 2 patients had osteoporosis, 10 (25.6%) patients had bone mineral density (BMD) values below 1.35 g /cm 2  on the TCI scale. Treatment with empagliflozin for 12 weeks was lead to significant increase in FGF-23. Compared to the baseline level, there were no statistically significant differences in the concentrations of P, oCa, Ca ++ , PTH and 25(OH)D after 12 weeks of treatment. The level of FGF-23 did not correlate with the level of glomerular filtration rate either before or after treatment (r = 0.31, p = 0.27 and r = 0.39, p = 0.55, respectively). In addition, baseline BMD adjusted for TBS and baseline 25(OH)D did not correlate with Ca, F, FGF-23, and PTH concentrations (p&gt;0.05).    Conclusion :  Thus, empagliflozin has increased the level of FGF-23 without significant changes in the concentration of phosphorus, calcium, 25 (OH) D, and PTH after 12 weeks of treatment in patients with T2DM and preserved renal function. The obtained data confirmed the necessity to assess the TBS in patients with T2DM, because it’s provide additional information on the quality of bone tissue.

Effect of empagliflozin on phosphorus and calcium metabolism in patients with type 2 diabetes mellitus with preserved kidney function