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. Author manuscript; available in PMC: 2023 Apr 3.
Published in final edited form as: Compr Physiol. 2021 Dec 29;12(1):2949–2993. doi: 10.1002/cphy.c210014

Table 3.

Potential Benefits and Risks of Testosterone Replacement Therapy (TRT) in Men with Low T Levels

Possible benefit or risk
Sexual function Small to moderate improvement in libido, sexual activity
Erectile function Possible small improvement
Quality of life Small improvement, driven mostly by improvement in sexual function
Physical function No significant effect on self-reported or objectively assessed performance measures
Vitality or fatigue No significant effect
Cognitive function No significant effect
Mood No significant effect
Body composition Increases lean mass; no significant effect on physical function
Bone mineral density No effect or small increase; no reduction in fracture risk
Glycemic control Uncertain effect; not recommended to improve glycemic control among patients with diabetes mellitus
Lipid profile No significant effect; may improve TG or worsen HDL-C slightly
CV events Uncertain
Mortality Uncertain
Prostate cancer Uncertain risk; monitor PSA; contraindicated in men with suspected prostate cancer
Erythrocytosis Increases hemoglobin and hematocrit; monitor CBC
Fertility Decreases sperm count; not appropriate for men who desire fertility in the near future
LUTS No worsening
Fluid retention May cause fluid retention and edema
OSA May worsen sleep apnea among patients with OSA

TG, triglycerides; HDL-C, high-density lipoprotein cholesterol; PSA, prostate-specific antigen; CBC, complete blood count; LUTS, low urinary tract symptoms; OSA, obstructive sleep apnea. Based on, with permission, Bhasin S, et al., 2018 (63); Qaseem A, et al., 2020 (481).