Medically reviewed by Anand Thakkar, MD. Last updated: October 6, 2026.
Is TRT safe? It’s the right question to ask before starting any long-term treatment. For men with confirmed low testosterone, the research has become much clearer in the last few years. A large trial called TRAVERSE, and a 2025 FDA label update, answered some old worries about the heart. Other risks, like a high red blood cell count and lower fertility, are real and need monitoring.
For treatment in Chicago, see testosterone replacement therapy in Chicago.
This guide walks through what the evidence shows, who shouldn’t take testosterone and how monitoring works. It’s general information. Your own risks depend on your health history and labs.
In This Article
- Is TRT Safe? The Short Answer
- Is TRT Safe for Your Heart? What TRAVERSE Found
- What the FDA’s 2025 Testosterone Label Update Says
- Common TRT Side Effects
- Is TRT Safe for the Prostate?
- Other Findings: Bones and Fractures
- Who Shouldn’t Take TRT?
- Why Monitoring Matters on TRT
- How Long Does TRT Take to Work?
- Can You Stop TRT Once You Start?
- TRT vs. Anabolic Steroid Misuse
- How Bliss MD Screens and Monitors TRT Patients
- Is TRT Safe? FAQs
- Talk to a Physician About Your Risks
Is TRT Safe? The Short Answer
For the right patient, with the right monitoring, TRT has a well-studied safety profile. It isn’t risk-free, and it isn’t for everyone. Three things decide whether TRT is safe for you:
- A real diagnosis. Guidelines from the American Urological Association and the Endocrine Society call for symptoms plus low testosterone on two separate morning tests.
- Careful screening. Your heart, clot, prostate and fertility history are reviewed before any prescription.
- Ongoing monitoring. Hematocrit, PSA, estradiol and blood pressure are checked on a regular schedule.
Skip any of those, and the answer to “is TRT safe?” gets less certain.
Is TRT Safe for Your Heart? What TRAVERSE Found
For years, small studies raised concerns that testosterone might cause heart attacks and strokes. To settle the question, the FDA asked makers of testosterone to run a large trial.
The TRAVERSE trial enrolled 5,246 men aged 45 to 80 with low testosterone. All had heart disease or a high heart risk. Half used testosterone gel and half used a placebo gel. The results:
- Major heart events (heart attack, stroke or heart-related death) occurred in 7.0% of men on testosterone and 7.3% on placebo. That’s no meaningful difference.
- Atrial fibrillation, acute kidney injury and lung clots (pulmonary embolism) were somewhat more common with testosterone.
So, is TRT safe for the heart? In men like those in the trial, it didn’t raise the risk of major heart events. The higher rates of irregular heartbeat and clots are why your history still matters.
What the FDA's 2025 Testosterone Label Update Says
On February 28, 2025, the FDA announced class-wide labeling changes for testosterone products:
- Added the TRAVERSE results to all testosterone labels.
- Removed the boxed-warning language about a higher risk of adverse heart outcomes.
- Added a blood pressure warning to products that didn’t already have one. Studies confirmed a blood pressure rise across all products.
- Kept the “limitation of use” for age-related low testosterone. Testosterone is FDA-approved for men with low levels together with an associated medical condition.
In plain terms: the heart warning is softer, blood pressure checks matter more, and a diagnosis still comes first.
Common TRT Side Effects
When men ask “is TRT safe?”, they usually mean side effects. Most testosterone replacement therapy side effects are manageable when caught early:
- Higher red blood cell count (hematocrit): the most common lab change. Thick blood may raise clot risk, so it’s checked regularly.
- Higher blood pressure: now listed on all testosterone labels.
- Acne or oily skin
- Breast tenderness or swelling: often linked to higher estradiol.
- Ankle swelling from fluid retention
- Worse sleep apnea
- Lower sperm count and smaller testes: testosterone signals the brain to slow your own production.
- Hair loss in men already prone to male pattern baldness
Some side effects depend on the form of testosterone. For example, high hematocrit was more common with injections than with pellets or gels in one study. Is TRT safe with pellets? They add site risks: bruising and, less often, infection or a pellet working its way out. In our experience, those are very low with our compounded pellets. Compare forms in testosterone pellets vs injections.
Is TRT Safe for the Prostate?
Is TRT safe for men worried about prostate cancer? Testosterone doesn’t seem to cause it in men who are screened first. In a TRAVERSE prostate analysis, high-grade prostate cancer occurred in 0.19% of men on testosterone and 0.12% on placebo. That difference wasn’t statistically significant. Urinary retention and prostate procedures didn’t differ either.
Two caveats matter. The trial excluded men with a PSA above 3.0 ng/mL, and PSA rose a little more in the testosterone group. That’s why PSA is checked before and during treatment, and why men with prostate cancer shouldn’t start TRT.
Other Findings: Bones and Fractures
Testosterone improves bone density in men with low T, so researchers expected fewer fractures. A TRAVERSE fracture analysis found the opposite. Over about three years, 3.50% of men on testosterone had a clinical fracture, compared with 2.46% on placebo. The reason isn’t clear. It’s a reminder that TRT isn’t a treatment for osteoporosis, and that bone health needs its own plan.
Who Shouldn't Take TRT?
Based on the Endocrine Society guideline, TRT is generally not recommended if you:
- Have prostate or breast cancer
- Have a prostate lump, or a raised PSA that hasn’t been evaluated
- Plan to father a child soon
- Have a high hematocrit before treatment
- Have untreated severe sleep apnea or severe urinary symptoms
- Have uncontrolled heart failure
- Had a heart attack or stroke in the last 6 months
- Have a history of blood clots or a clotting disorder
If any of these apply, the answer to “is TRT safe for me?” is probably no, at least for now. Other treatments may help, and some conditions can be treated first.
Why Monitoring Matters on TRT
Is TRT safe without monitoring? That’s where problems start. A good plan checks:
- Testosterone, to reach your optimal level, not the highest possible number
- Hematocrit: the Endocrine Society advises pausing treatment if it rises above 54%
- PSA, to watch prostate health
- Estradiol, if you have breast tenderness or fluid retention
- Blood pressure, at visits and at home if needed
- Sleep and symptoms, including snoring or daytime sleepiness
Labs are rechecked more often in the first months, then on a regular schedule your physician sets.
How Long Does TRT Take to Work?
A review of testosterone studies (Saad et al.) describes a general timeline:
- Sex drive: often improves in about 3 weeks, leveling off around 6 weeks
- Mood: may improve in 3 to 6 weeks
- Erections: can take up to 6 months
- Muscle, strength and body fat: changes start at 12 to 16 weeks
- Bone density: changes after about 6 months
Results vary. No change after a fair trial with good levels? Low T may not be the main cause of your symptoms.
Can You Stop TRT Once You Start?
Yes. TRT isn’t addictive, and you can stop. But plan it with your doctor:
- Your body’s own testosterone production slows on TRT. After stopping, it can take months to recover, sometimes longer after years of treatment.
- Symptoms of low T may return while your levels recover.
- A physician may suggest medicines that support your body’s own production during recovery. Some are used off-label.
If you’re thinking about stopping, we’ll build a plan and track your labs along the way.
TRT vs. Anabolic Steroid Misuse
People sometimes confuse the two. TRT uses replacement doses to bring low testosterone back to a healthy, physiologic level, with a diagnosis and monitoring. Steroid misuse uses much higher doses, often of several drugs, to build muscle. Many of the scary stories about testosterone come from misuse, not medical TRT. When people ask whether TRT is safe, it helps to know which one they’re reading about.
How Bliss MD Screens and Monitors TRT Patients
Is TRT safe for you? That’s the question we answer at your first visit. Before any prescription, Dr. Thakkar reviews your heart, clot, prostate and fertility history and confirms low T with morning labs. After you start, we check your labs and blood pressure on a set schedule and adjust your dose as needed. Labs are drawn on-site at both clinics.
Our goal is optimal, not just normal. Dr. Thakkar doesn’t want you to settle for a normal life. Is TRT safe when the goal is optimal? Only if optimal never means “as high as possible,” and that’s how we treat it.
Dosing is individualized to aim for the effects you want while minimizing side effects. We offer compounded subcutaneous injections in MCT oil (twice a week), compounded pellets and compounded cream at both clinics. For some patients, we also offer traditional intramuscular injections. Compounded products are not FDA-approved, and we always tell you which kind you’re getting.
Learn more about testosterone replacement therapy in Chicago, TRT in Schaumburg or testosterone pellets for men. Wondering about cost? Read TRT cost in Chicago.
Is TRT Safe? FAQs
Is TRT safe long term?
For men with confirmed low testosterone who are screened and monitored, large studies have been reassuring, including no rise in major heart events over about two to three years in TRAVERSE. Long-term use still needs regular labs, because risks like a high red blood cell count can develop at any time.
Does TRT cause heart attacks?
In the TRAVERSE trial of men at higher heart risk, testosterone gel didn’t raise the rate of heart attack, stroke or heart-related death compared with placebo. It did show somewhat more atrial fibrillation and lung clots.
Does TRT cause prostate cancer?
In TRAVERSE, rates of high-grade prostate cancer were low and not significantly different from placebo. Men with prostate cancer, or a PSA that hasn’t been checked out, shouldn’t start TRT. PSA is monitored during treatment.
Is TRT safe for men over 50?
Age alone doesn’t rule it out. TRAVERSE enrolled men aged 45 to 80. What matters is confirmed low T, your heart and prostate history, and regular monitoring.
What are the most common TRT side effects?
Acne or oily skin, a higher red blood cell count, breast tenderness, ankle swelling, worse sleep apnea and a lower sperm count. Higher blood pressure is now listed on testosterone labels.
Can you stop TRT once you start?
Yes, but plan it with your doctor. Your body’s own testosterone can take months to recover, and symptoms may return.
How long does TRT take to work?
Sex drive often improves within about 3 weeks. Mood may change in 3 to 6 weeks, and muscle and body fat over 12 to 16 weeks or longer. Results vary.
Are compounded testosterone pellets and creams safe?
Compounded products are made by licensed compounding pharmacies but are not FDA-approved, so they haven’t had the same FDA review as brand products. We use them because they let us match the dose to your labs, and we monitor every patient the same way. In our experience, pellet extrusion and infection rates are very low.
Does TRT cause hair loss?
It can speed up male pattern hair loss in men who are prone to it. That’s because some testosterone is converted to DHT. Tell us if hair loss is a concern.
Talk to a Physician About Your Risks
Start with a free 15-minute discovery call, then see us at our Lincoln Park clinic or our Schaumburg-area clinic in Hanover Park. Not sure your symptoms are hormonal? Read about low testosterone symptoms.
Bliss MD – Lincoln Park
2707 N Halsted St, Chicago, IL 60614
Phone: (630) 289-0440 · Open in Maps
Bliss MD – Hanover Park (Schaumburg Area)
1802 Irving Park Rd, Hanover Park, IL 60133
Phone: (630) 289-0440 · Open in Maps
Sources
- Lincoff AM, et al. Cardiovascular Safety of Testosterone-Replacement Therapy (TRAVERSE). N Engl J Med. 2023;389:107–117. nejm.org
- U.S. Food and Drug Administration. FDA Issues Class-Wide Labeling Changes for Testosterone Products. February 28, 2025. fda.gov
- Bhasin S, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018. academic.oup.com
- American Urological Association. Evaluation and Management of Testosterone Deficiency (AUA Guideline). auanet.org
- Bhasin S, et al. Prostate Safety Events During Testosterone Replacement Therapy in Men With Hypogonadism. JAMA Netw Open. 2023;6(12):e2348692. jamanetwork.com
- Snyder PJ, et al. Testosterone Treatment and Fractures in Men with Hypogonadism. N Engl J Med. 2024;390:203–211. nejm.org
- Saad F, et al. Onset of effects of testosterone treatment and time span until maximum effects are achieved. Eur J Endocrinol. 2011;165(5):675–685. doi.org
This article is educational and is not a substitute for medical advice. Get urgent care for chest pain, trouble breathing, one-sided leg swelling or sudden weakness.
