Rapid Changes in Serum Testosterone in Men With Newly Diagnosed Type 2 Diabetes With Intensive Insulin and Metformin
Yun Hu, Bo Ding, Yun Shen, Reng-Na Yan, Feng-Fei Li, Rui Sun, Ting Jing, Kok-Onn Lee, Jian-Hua Ma, Yun Hu, Bo Ding, Yun Shen, Reng-Na Yan, Feng-Fei Li, Rui Sun, Ting Jing, Kok-Onn Lee, Jian-Hua Ma
Abstract
Objective: To investigate the effect of metformin on testosterone levels in men with type 2 diabetes mellitus (T2DM).
Research design and methods: Seventy men with newly diagnosed drug-naive T2DM and HbA1c >9.0% (75 mmol/mol) were treated with intensive insulin pump therapy for 5 days to achieve glucose normalization. They were randomized to control (continued on intensive insulin only) and metformin (plus metformin) groups (1:1) for 1 month. Testosterone was measured at baseline, randomization, and after 1-month treatment.
Results: Total, free, and bioavailable testosterone increased significantly within 5 days (all P < 0.001). After 1 month, compared with the control group, the metformin group had lower total (12.7 vs. 15.3 nmol/L), free (0.20 vs. 0.24 nmol/L), and bioavailable (4.56 vs. 5.31 nmol/L) testosterone (all P < 0.05).
Conclusions: In men with T2DM, 1-month oral metformin may decrease serum testosterone levels independent of blood glucose control. The effects of long-term metformin on testosterone in men need further study.
Trial registration: ClinicalTrials.gov NCT03982238.
© 2021 by the American Diabetes Association.
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Source: PubMed