Being told you need androgen deprivation therapy can feel like the ground has shifted under you. You are already carrying a prostate cancer diagnosis, and now you are hearing that the treatment itself will change how your body feels day to day. That worry is completely understandable, and you are not alone in it. Many men describe this stage as a kind of “medical menopause,” because lowering testosterone touches so much of how you feel and function.
Here is the reassuring part. The side effects of androgen deprivation therapy (ADT) are real, however they are also well understood and, in most cases, manageable with the right monitoring and a few proactive habits. Managing ADT side effects is far less daunting once you know what to watch for. In this blog post, we will discuss what ADT does to your body, the side effects worth watching, and the practical steps you and your care team can take together to keep you strong.
Why Does ADT Cause Side Effects in the First Place?
ADT is a cornerstone of treatment for many men with prostate cancer. It works by lowering testosterone to very low levels, which removes the fuel that prostate cancer cells rely on to grow. That is exactly what makes it effective.
The same drop in testosterone, however, ripples out to systems that have nothing to do with the prostate. Testosterone helps maintain your bones, your muscle, your metabolism, and your cardiovascular system, so when it falls, those areas feel it too. That is the simple reason behind side effects such as hot flashes, fatigue, and the quieter shifts happening in your bones and your blood sugar.
Rest assured, none of this means something has gone wrong. It is the expected trade-off of a therapy doing its job, and most of it can be anticipated and softened.
Protecting Your Bones and Your Balance
One of the most important areas to watch during ADT is bone health. Testosterone is a major driver of bone strength, and without it, bones can gradually thin and become more fragile, a process that can lead to osteoporosis.
This matters because fractures are genuinely common in this group. In a large U.S. cohort of more than 54,000 older men starting ADT for localized or regional prostate cancer, about 17.5% went on to experience a fracture during follow-up.[1] That same study reported a mixed picture worth understanding plainly. Having bone density measured with a DXA scan was not associated with the risk of any fracture (HR 0.96, 95% CI 0.89 to 1.04), however it was associated with a lower risk of major fractures, although that finding was borderline and observational (HR 0.91, 95% CI 0.83 to 1.00). In short, the data suggest bone monitoring is worth doing, even if it cannot promise a particular outcome on its own.
That is why guidance points toward a baseline DXA scan when you begin long-term ADT. A DXA scan is a quick, painless imaging test that measures bone density and helps your clinician estimate your fracture risk, often alongside a tool such as the FRAX assessment. Despite how clearly it helps, bone testing is still underused in practice. A separate analysis of more than 17,000 men on ADT found that only about 15% received bone-density testing, even though those who did were far more likely to have osteoporosis identified and treated.[2]
To keep your skeleton resilient, your team may suggest a few things working together. Daily calcium and vitamin D are standard groundwork. Weight-bearing movement such as walking or resistance training helps signal your bones to stay strong. And if your fracture risk is high, your doctor may discuss bone-protective medicines such as denosumab or a bisphosphonate. Your clinician decides which of these fits you, and at what point.
The Metabolic Shift: Weight, Muscle, and Blood Sugar
Lowering testosterone often nudges your body toward what doctors call metabolic syndrome. You may notice more body fat, especially around the middle, alongside a loss of lean muscle. ADT can also make your body less sensitive to insulin, which raises the risk of developing type 2 diabetes. If you want to understand that link more deeply, see our explainer on testosterone and insulin resistance.
Monitoring is your friend here. During the first year of treatment, your care team will likely keep an eye on your blood pressure, your cholesterol, and your blood sugar (such as fasting glucose or HbA1c) at regular intervals. A heart-healthy diet and consistent activity remain the most reliable ways to push back against these metabolic changes.
What’s more, the same habits that steady your metabolism also protect your heart, so the effort does double duty.
What Does ADT Do to Your Heart?
Because metabolism and cardiovascular health are so tightly linked, the heart deserves real attention during ADT. The evidence here has matured, and it is worth understanding plainly.
A 2025 systematic review and meta-analysis pooling six studies in 560 men found that ADT was associated with measurable changes in the heart itself, including a small reduction in left ventricular ejection fraction (about 2.3%) compared with baseline.[3] These are modest, averaged changes rather than a guarantee of heart trouble, however they explain why your team keeps cardiovascular monitoring on the schedule.
To make heart-risk management easier to remember, many clinicians use the “ABCDE” framework first described in Circulation.[4] It breaks a complex topic into plain steps. “A” stands for awareness of your cardiovascular risk and a conversation about whether low-dose aspirin suits you. “B” is blood pressure, kept controlled with a target your doctor sets for you. “C” covers cholesterol and cigarettes, so managing lipids and quitting smoking both count here. “D” is diet and diabetes, which means a heart-friendly diet and close attention to blood sugar. “E” is exercise, generally aiming for around 150 minutes of moderate activity each week, blending aerobic work with strength training.
You do not have to master all five at once. Pick one, build the habit, and add the next.
When Should You Speak Up to Your Clinician?
Managing ADT is a team effort, and you are the most important member of that team. You should not wait for your next scheduled visit if you notice meaningful changes in your mood, your energy, or your physical health.
A few things are worth confirming you have in place. A baseline DXA scan before or shortly after you start treatment. A clear schedule for blood work covering your lipids and glucose. An open conversation about your specific therapy and your heart history.
That last point carries a useful nuance. Not all ADT drugs behave identically when it comes to the heart. A 2025 meta-analysis comparing the GnRH antagonist degarelix with traditional GnRH agonists found no overall difference in major cardiovascular events, however it did find a lower risk of heart failure with degarelix.[5] If you have a history of heart failure, that distinction may be worth raising with your oncologist.
One more piece of current context can help you make sense of conflicting headlines. In 2025, the FDA removed the older cardiovascular boxed warning from testosterone replacement products after the TRAVERSE trial, while at the same time adding a new warning about increased blood pressure. ADT is the opposite of testosterone replacement, however the episode is a good reminder that hormone-and-heart science keeps evolving, and your clinician is the right person to translate it for your situation. You can read the full story in our breakdown of the FDA’s 2025 testosterone label change.
If you have pre-existing heart or bone concerns, a referral to a specialist such as a cardio-oncologist or a physical therapist can add another layer of support.
Conclusion
ADT asks a lot of your body, and it is fair to feel uneasy about that. The encouraging truth is that the side effects most likely to affect you, such as bone loss, metabolic shifts, and cardiovascular strain, are exactly the ones your care team can monitor and manage. With a baseline DXA scan, steady blood work, sensible movement, and honest conversations about your therapy, you can protect your bones, your heart, and your quality of life while the treatment does its essential work against the cancer.
Your oncologist’s first job is to treat the cancer, and your life beyond treatment matters just as much. Do not hesitate to advocate for the monitoring and support you deserve.
References
- [1] Suarez-Almazor ME et al., JAMA Netw Open. 2022, PMID 35363269
- [2] Kirk PS et al., BJU Int. 2018, PMID 29124881
- [3] Kemp BR et al., Int Urol Nephrol. 2025, PMID 41307789
- [4] Bhatia N et al., Circulation. 2016, PMID 26831435
- [5] Liu W et al., Front Oncol. 2025, PMID 41103953
Medically reviewed by Ahmed Zayed, MBBCh, a clinician with 12 years of practice. This article is for education and does not replace a consultation with your own doctor.
