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The Study

Long-Term Cardiovascular Safety of Testosterone-Replacement Therapy in Middle-Aged and Older Men: A Meta-analysis of Randomized Controlled Trials

In simple terms

This study looked at many experiments where some men got testosterone and others got sugar pills. It found that testosterone made heart rhythm problems more common, but didn’t clearly make people more likely to die, have heart attacks, or have strokes. So we can say testosterone probably causes heart rhythm issues, but we’re not sure if it’s totally safe for the heart otherwise.

73%

Analysis score

73/ 100

Maximum 100 for a systematic review with meta-analysis.

Where the score came from

Reporting0
Methodology81
Publication100
Statistical100
Study type (basis of the score)
Systematic Review with Meta-Analysis
Level 1a - Systematic review of RCTs
What’s the bottom line?

This study looked at whether giving extra testosterone to older men with low levels helps or harms their hearts.

Where does this study sit?

Systematic Reviews & Meta-analyses

Max 100

Randomized Trials

Max 90

Cohort Studies

Max 72

Case-Control

Max 58

Cross-Sectional

Max 44

Case Reports & Series

Max 30

Expert Opinion

Max 5
StrongerWeaker
Systematic Reviews & Meta-analyses
Level 1a
73

73 / 100

Quality score

The highest quality evidence. These studies systematically search, appraise, and synthesize results from multiple individual studies, providing the most reliable summary of current knowledge.

Can establish causation

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Key takeaways

Summary

Based on the study abstract and findings.

  1. 1A 53% rise in irregular heartbeats is a real concern for older men; other risks can't be ruled out because the data is too uncertain.
  2. 21.
  3. 3Arrhythmias went up by 53%.
  4. 42.
  5. 5Deaths, heart attacks, strokes, and heart-related deaths didn't go up significantly—but the numbers could still hide a risk.

Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data

Publication

Journal

American Journal of Cardiovascular Drugs

Year

2025

Authors

M. Braga, A. Rivera, Gabriel Marinheiro, Nicole Felix, Pedro E. P. Carvalho, D. Gewehr, Larissa Teixeira, M. Clemente, P. Reis, L. G. D. de Amorim, A. D. Marinho, Thiago Bosco Mendes, F. Mesquita, Edoardo Pozzi, Ranjith Ramasamy

5 citations
Analysis v3
DOI:10.1007/s40256-025-00737-w
PubMed:40694252
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Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.