Long-term TRT in men with confirmed testosterone deficiency produces sustained improvements in sexual function, lean muscle mass, bone density, insulin sensitivity, and quality of life, based on current research through 2026. The most significant long-term risk remains erythrocytosis (elevated red blood cell count), which is manageable with regular monitoring. Cardiovascular safety data has become considerably more reassuring following major clinical trials, though ongoing vigilance is appropriate.
If you’re already on TRT, considering a long-term commitment, or reviewing whether it’s still the right path, here’s what the most current evidence shows.
What “Long-Term” Means in the TRT Context
Most clinical studies define long-term TRT as treatment lasting a year or more, though some landmark research has now tracked men for 5-10 years. This is meaningful, because earlier safety concerns were largely based on shorter, less well-controlled studies. The evidence picture in 2026 is notably more complete than it was even five years ago.
Sustained Benefits: What Research Shows Over Time
Sexual function and libido
Improvements in libido and sexual satisfaction reported in the first months of TRT tend to persist with continued treatment in men who maintain therapeutic testosterone levels. For men whose ED had a hormonal component, improvements tend to be sustained as long as treatment continues.
Lean muscle mass and strength
TRT’s anabolic effects on muscle persist with ongoing treatment. A narrative review published in 2025 examining men aged 50 and above found that TRT consistently improved lean body mass and muscle strength across multiple studies, with benefits most evident in men with baseline testosterone below 300 ng/dL.
Bone mineral density
Testosterone supports bone health, and longer-term studies show measurable improvement in bone density with extended TRT. This is particularly relevant for men with osteoporosis risk, where low testosterone is an independent contributing factor.
Metabolic health and insulin sensitivity
Multiple studies show improvements in insulin sensitivity and favorable changes in body composition (reduced fat mass, increased lean mass) with extended TRT. These metabolic benefits may have implications for type 2 diabetes risk reduction, though this area requires more research.
Quality of life and psychological well-being
Long-term users consistently report sustained improvements in mood, energy, cognitive function, and motivation compared to pre-treatment baseline, as long as levels are maintained in an appropriate therapeutic range.
Long-Term Risks: What Requires Ongoing Monitoring
Erythrocytosis (elevated red blood cell count)
This remains the most common clinically significant side effect of long-term TRT and requires consistent monitoring. Research suggests roughly 11% of men on injectable testosterone develop elevated hematocrit over time. Left unaddressed, significantly elevated hematocrit increases blood viscosity and potential clot risk. Management includes dose reduction, formula switch, or therapeutic phlebotomy (blood donation). Regular blood panels catch this before it becomes dangerous.
Cardiovascular health: The updated picture in 2026
- The landmark 2023 TRAVERSE trial, the largest randomized trial of TRT to date, found no significant increase in major adverse cardiovascular events (heart attack, stroke, or cardiac death) in men with confirmed hypogonadism compared to placebo
- Based partly on this evidence, the FDA removed the previous boxed cardiovascular warning from testosterone labels in 2025, replacing it with a blood pressure monitoring warning
- Early 2026 Mendelian randomization data found that men with genetically higher lifelong testosterone had a modestly higher coronary artery disease risk, partly through blood pressure pathways, adding a note of ongoing caution even as the overall cardiovascular picture has improved
- Current guidance: TRT does not appear to significantly increase cardiovascular risk in properly selected, monitored men with confirmed deficiency, but individual cardiovascular risk factors should be assessed and monitored throughout treatment
Prostate health
- TRT raises PSA levels in some men, requiring baseline and periodic monitoring
- Research does not support TRT causing prostate cancer, though it may accelerate growth of undetected existing cancer, which is why prostate cancer is a contraindication for TRT
- Current evidence suggests TRT does not worsen lower urinary tract symptoms and may even improve them in some cases
Testicular atrophy and fertility
Long-term TRT suppresses the hypothalamic-pituitary-gonadal axis, leading to reduced testicular size and diminished sperm production. This is a sustained effect as long as treatment continues. Most men’s natural production partially recovers after stopping, though recovery can take months and is not guaranteed to be complete, particularly after extended treatment.
Sleep apnea
TRT may initially worsen sleep apnea in predisposed men. This typically stabilizes over time but warrants evaluation if symptoms appear or worsen.
The Commitment Question: Is TRT Lifelong?
This is one of the most important practical questions about long-term TRT. For most men:
- Testosterone levels will return to pre-treatment (deficient) baseline if treatment is stopped
- This is because TRT suppresses natural production, and restarting natural production takes time
- Discontinuing TRT typically results in a return of original symptoms
This means most men with genuinely low testosterone treat TRT as an ongoing commitment rather than a temporary course. Understanding this upfront helps set realistic expectations for both the treatment and its costs.
What Monitoring Looks Like Long-Term
Responsible long-term TRT includes:
- Lab monitoring every 3-6 months, at minimum including testosterone, estradiol, hematocrit, and PSA
- Blood pressure monitoring throughout treatment
- Periodic assessment of symptoms and treatment effectiveness
- Discussion of prostate health and any family history concerns
- Regular review of whether the treatment is still achieving its original goals
Reviewing your testosterone levels guide gives you a framework for understanding what your follow-up numbers mean at each stage of long-term treatment.
Who Benefits Most From Long-Term TRT
Long-term TRT produces the most consistent multi-system benefits in men who:
- Have confirmed baseline testosterone below 300 ng/dL
- Show relevant symptoms that have responded to treatment
- Maintain their levels in a target range of approximately 500-800 ng/dL
- Receive regular monitoring and stay engaged with their provider
The benefits of TRT page covers more detail on what to expect from sustained treatment. For men at different life stages, our guide on TRT for men over 40 addresses how long-term benefits play out as you age.
What Long-Term TRT Costs
Monthly costs for ongoing TRT range from $99-250 per month for all-inclusive telehealth programs, with injectable testosterone being the most cost-effective delivery method. Labs and physician oversight are included in most program fees.
Invested in the Long Game?
If you’re thinking about TRT as a sustained commitment to your health, book an appointment to build a plan with proper monitoring from the start.
FAQs
Is TRT a lifelong commitment?
For most men with genuine testosterone deficiency, yes. Stopping treatment typically results in levels returning to deficient baseline and symptoms returning.
Does long-term TRT increase cancer risk?
Current evidence does not support TRT causing prostate cancer, though it is contraindicated for men with active prostate cancer and requires PSA monitoring throughout treatment.
What is the main long-term side effect to monitor?
Erythrocytosis (elevated red blood cell count) is the most common clinically significant long-term side effect, managed through regular bloodwork and dose adjustments when needed.
Has TRT been proven safe for the heart long-term?
The 2023 TRAVERSE trial showed no significant increase in major cardiovascular events in properly selected men with hypogonadism. However, blood pressure monitoring is now part of standard TRT care.
Does long-term TRT shrink the testicles permanently?
Testicular atrophy occurs with ongoing TRT due to suppressed natural production. Most men’s testes partially recover after stopping, though recovery may not be complete after extended treatment.
How often do I need bloodwork on long-term TRT?
Every 3-6 months is standard for most men on stable long-term TRT, tracking testosterone, estradiol, hematocrit, and PSA at minimum.
Sources
- PMC/NIH – Adverse Effects of Testosterone Replacement Therapy: An Update on the Evidence and Controversy: https://pmc.ncbi.nlm.nih.gov/articles/PMC4212439/