Does TRT Work? What the Evidence Says for Australian Men

Testosterone replacement therapy (TRT) works when it is used for the right reason: a genuine testosterone deficiency confirmed by blood tests and symptoms. In the largest placebo-controlled efficacy trial to date, men with confirmed low testosterone who were treated for a year had significantly better sexual function, sexual desire and erectile function than men on placebo New England Journal of Medicine, 2016. What TRT does not do is lift energy, mood or muscle in men whose levels are already normal.

This guide covers what the published evidence actually shows, how low testosterone is diagnosed in Australia, and what treatment involves for men who qualify.

What TRT is

Testosterone regulates sex drive, bone strength, muscle mass and sperm production Healthdirect, 2026. When the body stops making enough, doctors call it testosterone deficiency, androgen deficiency or hypogonadism. TRT replaces the missing hormone with prescribed testosterone to bring blood levels back into the normal range.

Low testosterone has identifiable causes. Damage to the testes from injury, undescended testes or mumps. Problems with the pituitary gland. Genetic conditions such as Klinefelter syndrome, which affects around one in 600 men and often goes undiagnosed Healthy Male, 2026. Obesity, chronic illness and some medicines can also push levels down.

Ageing on its own is a different story. Levels drift down over the decades, but a healthy man is unlikely to see a drop large enough to need treatment, and there is no such thing as male menopause Healthy Male, 2026. The distinction matters, because TRT only helps where a deficiency actually exists.

Does TRT actually work?

The strongest efficacy data comes from the Testosterone Trials, a set of placebo-controlled studies of 790 men aged 65 and over with confirmed low testosterone. After 12 months of treatment, sexual activity, sexual desire and erectile function had all improved significantly compared with placebo, and men on testosterone reported slightly better mood and fewer depressive symptoms New England Journal of Medicine, 2016.

The same trials keep expectations honest. Vitality, measured on a standard fatigue scale, showed no significant benefit. Gains in walking distance were modest and only reached statistical significance when results across the trial groups were pooled. TRT has its best evidence for sexual symptoms; sweeping claims about energy and muscle transformation run ahead of the data.

Safety has now been tested at scale as well. The TRAVERSE trial, published in 2023, followed 5,246 men aged 45 to 80 who had low testosterone alongside existing heart disease or high cardiovascular risk. Major cardiac events occurred at almost the same rate in the testosterone group (7.0 per cent) as in the placebo group (7.3 per cent). Treated men did record more atrial fibrillation, pulmonary embolism and acute kidney injury New England Journal of Medicine, 2023.

So the fair summary is this. For men with a confirmed deficiency, TRT improves sexual function and mood under proper medical supervision. It is not risk free, and responses vary between individuals. No doctor can promise a particular result.

Signs your testosterone might be low

Common symptoms include low sex drive, erection problems, fatigue, low mood, poor concentration, disturbed sleep and hot flushes. Physical signs can include more body fat, less muscle, breast swelling and reduced facial or body hair Healthdirect, 2026.

None of these is unique to low testosterone. Depression, thyroid problems, poor sleep and sleep apnoea can produce a similar picture, which is exactly why testing comes before treatment. Our guide to the 12 key symptoms of low testosterone in men over 40 covers the warning signs in more detail.

How low testosterone is diagnosed in Australia

Diagnosis starts with a blood test taken early in the morning, ideally fasting, because levels move around during the day. One low reading is not enough; a second test is needed to confirm it Healthdirect, 2026. Your doctor will usually also check pituitary hormones and other markers to work out why levels are low, since the cause changes the treatment.

Online quizzes and symptom checkers, including Menova's online assessment, may help identify men who should get tested. They screen, they do not diagnose. Only a registered doctor can confirm testosterone deficiency and decide whether treatment is appropriate.

Who TRT is for, and who it is not

TRT is for men with symptoms plus low readings confirmed on repeat testing. Doctors will not prescribe it for men with prostate or breast cancer, or for men planning to try for a child, because testosterone therapy suppresses sperm production Healthdirect, 2026. Conditions such as untreated severe sleep apnoea or a high red blood cell count generally need addressing first.

Men with normal levels are not candidates. Taking testosterone without a deficiency adds risk with no demonstrated benefit, and misuse has been linked to serious harm including cardiovascular disease and liver damage Healthy Male, 2026.

At Menova, suitability is assessed by a registered doctor. Not every man who enquires will be eligible, and our doctors prescribe only where it is clinically appropriate.

Treatment options available in Australia

Prescribed testosterone comes in several forms in Australia: injections, which are the most common, gels and creams applied to the skin, and oral capsules Healthy Male, 2026. Each form trades off convenience, cost and how steadily it holds blood levels. The choice of form, dose and schedule is a decision for the prescribing doctor based on your health, your results and your preferences.

How long does TRT take to work?

Gradually. Changes build over weeks to months rather than days, and doctors typically review symptoms and repeat blood tests three to six months after starting, then at regular intervals Healthy Male, 2026. Treat week-by-week benefit timetables with suspicion; the major trials measured their outcomes at 12 months, not 14 days.

Side effects and monitoring

Possible side effects include acne, hair loss and a rise in red blood cell count, and treatment reduces fertility in some people Healthdirect, 2026. The red cell effect is the reason monitoring is not optional: if haematocrit climbs above 54 per cent, treatment is stopped or adjusted Healthy Male, 2026. The TRAVERSE findings on atrial fibrillation and pulmonary embolism are also why doctors check heart rhythm and clotting risk before and during treatment New England Journal of Medicine, 2023.

Keep your regular GP informed throughout. Telehealth care works best alongside your usual GP, not instead of them, and they should know about any new prescription and see copies of your results.

Cost and access

Testosterone is a prescription-only medicine. PBS-subsidised prescriptions require authority approval against strict clinical criteria, and many symptomatic men do not meet them Pharmaceutical Benefits Scheme, 2026. Men outside the PBS criteria can still be treated privately on a doctor's prescription, with higher out-of-pocket costs.

What you pay depends on the form of testosterone, the clinic and the amount of monitoring involved, so treat any flat monthly figure you see advertised with caution. A consultation is the first step, and it should make the likely costs clear before anything is prescribed. You can read more about how Menova approaches hormone health on our hormone restoration page.

Where lifestyle fits

Obesity is a recognised cause of low testosterone, which means losing weight can lift levels without a prescription Healthdirect, 2026. Better sleep, regular exercise and less alcohol support natural production as well Healthy Male, 2026. Our guides to natural testosterone boosters and five lifestyle changes that can naturally boost testosterone cover the practical steps. If treatment is warranted, this work still matters alongside it.

Frequently asked questions

How long does TRT take to work?

Gradually, over weeks to months. The major trials measured benefits at 12 months, and Australian practice is to review symptoms and repeat blood tests three to six months after starting. Anyone promising noticeable results inside a fortnight is running ahead of the evidence.

Is TRT legal in Australia?

Yes, with a valid prescription. Testosterone is a prescription-only medicine in Australia, and PBS-subsidised scripts need authority approval. Buying it from unregulated online sources without a prescription is unsafe and against Australian law, with no quality control and no medical monitoring.

Can I get TRT on the PBS?

Only if you meet strict criteria. PBS-subsidised testosterone is an authority-required prescription, and many men with genuine symptoms do not qualify for the subsidy. Those men can still be treated privately on a doctor's prescription, with costs varying by clinic, treatment form and monitoring needs.

Will TRT help if my testosterone is normal?

No. The trial benefits were found in men with confirmed deficiency. For men with normal levels, testosterone adds risk without demonstrated benefit, and misuse has been linked to serious harm including cardiovascular disease and liver damage. A confirmed diagnosis comes before any treatment decision.

Is TRT safe for my heart?

The 2023 TRAVERSE trial followed 5,246 men at high cardiovascular risk and found no increase in heart attack, stroke or cardiovascular death compared with placebo. It did record more atrial fibrillation and pulmonary embolism, so doctors screen for rhythm and clotting risk and monitor throughout treatment.

Does TRT affect fertility?

Yes. Testosterone therapy suppresses sperm production while you are taking it, and doctors will not prescribe it to men planning to try for a child. Raise any fertility plans with your doctor before starting so alternatives and fertility preservation options can be discussed.

Do I have to stay on TRT for life?

Often it is long-term, because treatment replaces the hormone rather than fixing the underlying cause, and levels generally fall back once it stops. Some men whose deficiency is driven by obesity or illness can improve natural production by treating the cause. Review the plan with your doctor regularly.

References

• Healthdirect Australia. Testosterone. https://www.healthdirect.gov.au/testosterone
• Healthy Male. What is testosterone replacement therapy. https://healthymale.org.au/health-article/what-is-testosterone-replacement-therapy
• Effects of Testosterone Treatment in Older Men. New England Journal of Medicine, 2016. https://pubmed.ncbi.nlm.nih.gov/26886521/
• Cardiovascular Safety of Testosterone-Replacement Therapy. New England Journal of Medicine, 2023. https://pubmed.ncbi.nlm.nih.gov/37326322/
• Pharmaceutical Benefits Scheme. Testosterone listing. https://www.pbs.gov.au/medicine/item/10378F