Diabetes and erectile dysfunction are closely linked, and the connection rarely gets more than a passing mention in a diabetes review. Feet, eyes, kidneys and HbA1c get checked. Erections usually do not come up unless you raise them.
The overlap is common. Across 145 studies, about 52% of men with diabetes had ED. Diabetes Australia puts significant ED at around one in five men with diabetes from their late forties. That is early.
Here is the part worth holding onto: diabetic ED arrives earlier and is often more stubborn, but it remains treatable, and some treatments work particularly well in this group. Dr Phillip Katelaris sees men with diabetes for erectile dysfunction treatment at Hornsby, Castle Hill and St Leonards.
Why diabetes causes erectile dysfunction
Diabetes damages the two systems an erection depends on: the blood vessels that fill the penis and the nerves that tell them to. Most men with diabetic ED have some degree of both.
Blood vessel damage
Persistently high blood glucose damages the endothelium, the thin inner lining of blood vessels. Healthy endothelium releases nitric oxide, which signals the arteries to relax and open so blood can flow in. That is the mechanism an erection runs on.
When endothelial function is impaired, the arteries do not dilate properly and not enough blood arrives. The vessels supplying the penis are narrow to begin with, so they feel it early.
Nerve damage (diabetic neuropathy)
Diabetic neuropathy disrupts the signal that starts the whole process. An erection begins as a message travelling from the brain and spinal cord along small autonomic nerves to the penile tissue, and prolonged high blood glucose damages those nerves much as it damages the nerves in the feet.
This is the most useful thing to understand about diabetic ED. Oral tablets amplify a signal that is already there; they do not create one. Where nerve signalling is impaired, tablets have less to work with, which is why they underperform in this group.
Hormonal and metabolic factors
Low testosterone is more common in men with type 2 diabetes than in the general population, and it compounds the problem by reducing both desire and erectile response. The relationship runs both ways, since excess body fat converts testosterone to oestrogen.
Obesity, high blood pressure and abnormal lipids frequently travel with type 2 diabetes, and each independently affects erectile function. The picture is usually layered rather than single-cause.
Medication effects
Diabetes medications themselves are not typical causes of ED. The medications commonly prescribed alongside them sometimes are, particularly certain blood pressure medications and some antidepressants. A medication review is a standard part of a proper assessment, and alternatives often exist. Raise it at your appointment, and do not stop a prescribed medication without speaking to the doctor who prescribed it.
Why ED is often the earliest warning sign
ED often turns up years before any chest symptom. If you have diabetes, that is worth knowing. It says something about your blood vessels.
The reasoning is anatomical. The cavernosal arteries supplying the penis are considerably narrower than the coronary arteries supplying the heart. The same atherosclerotic process affects both, but a given amount of narrowing shows up in the smaller vessel first, so ED becomes symptomatic while the coronary arteries are still coping.
For a man with diabetes, new or worsening erectile dysfunction is a reasonable trigger for a cardiovascular review with your GP. Men are sometimes told that ED is simply part of having diabetes. It is a complication of diabetes, which is a different statement, and complications get investigated. Our page on ED and related health issues covers these links in more detail.
Erectile dysfunction treatment options for men with diabetes
The same treatment ladder applies, but the rungs perform differently when diabetes is in the picture.
Oral medications, and why response rates are lower
PDE5 inhibitor tablets still help plenty of men with diabetes. They just work less often than they do in men without it. That is a reason to try them properly, not a reason to skip them. Two attempts and a shrug is not a fair test.
Dose matters here. Men with diabetes usually need the top of the range. There is a choice too, between a tablet when you need one and a small dose daily. Ask about both. Low testosterone on repeat morning blood tests is worth sorting out first, since tablets tend to work better after that. If a full dose gets a fair run and nothing much happens, you need a different treatment, not the same script again.
Injection therapy
Penile injection therapy is particularly valuable for men with diabetes because it works independently of nerve signalling. Medication delivered directly into the erectile tissue causes the blood vessels to dilate whether or not the nerve message is getting through, which is exactly the problem diabetic neuropathy creates.
Response rates are high even in men for whom tablets have failed. The needle is the sticking point for most men, though it is comparable in size to an insulin needle and many men with diabetes are already familiar with that. Training is given in the rooms and the dose is titrated carefully under supervision. Our post on penile injection therapy explains the practicalities.
Vacuum erection devices
A vacuum device is a pump and a ring. The pump draws blood into the penis and the ring at the base keeps it there. Nothing to swallow, so it suits men who cannot take PDE5 inhibitors. Being mechanical, it is not much bothered by damaged nerves or vessels. The drawbacks are practical. You need to practise, and it breaks the mood. If your sensation is reduced, get someone to show you how to use it, and take the ring off when you are told to.
Penile implants in men with diabetes
Men with diabetes are among the most common candidates for penile implant surgery, because diabetic ED more often reaches the point where other treatments no longer deliver.
An inflatable prosthesis is placed within the erectile tissue and operated by a concealed pump. It does not rely on blood flow or nerve signalling, which is why it remains effective when everything upstream has failed.
On infection risk, the evidence deserves a careful summary. Diabetes has long been treated as a risk factor for prosthesis infection, and older studies supported that. More recent multicentre data have not consistently shown that preoperative HbA1c or blood glucose predicts infection, and there is no agreed threshold. Most surgeons still work to improve glycaemic control before proceeding, on general surgical grounds around wound healing, and surgical experience appears to matter considerably. As with any surgery there are risks, discussed in full beforehand. You can read more on our penile prosthetic surgery page.
Optimising diabetes management itself
Better glycaemic control, blood pressure control and weight management support erectile function, particularly when ED is recent and the damage is not yet established.
You have heard that before. It is one lever among several, not a hurdle to clear first. Nobody should be sent away to come back with a better HbA1c. Assessment and treatment can run alongside diabetes care, and usually do.
What to bring to your appointment if you have diabetes
A little preparation makes the first consultation considerably more productive:
- Your most recent HbA1c result, and earlier ones if you have them
- A complete list of current medications, including diabetes medications and anything bought over the counter
- Recent blood pressure and lipid results
- Any cardiology correspondence or recent cardiac investigations
- A note of when the erectile difficulty began and what has already been tried
Our guide on preparing for an ED appointment covers the rest, and the erectile dysfunction page sets out causes and treatments generally.
Why choose Dr Katelaris for erectile dysfunction treatment in Sydney & North Shore
Dr Phillip Katelaris is a specialist urologist and urological surgeon with more than 35 years of clinical experience. He is a Fellow of the Royal Australasian College of Surgeons (FRACS) and a member of the Urological Society of Australia and New Zealand (USANZ), completed postgraduate surgical training in Germany and robotic surgery training in the United States, and performs procedures at Sydney Adventist Hospital.
Men with diabetes are the group for whom the full range of options matters most. Dr Katelaris works across that range, from medical management and dose optimisation through penile injection therapy and linear shockwave therapy to penile prosthetic surgery, which he has performed in Sydney for many years. He also performed the first vasectomy reversal in Australia using the ROBOTICSCOPE platform.
The sequence is assessment first. Erectile dysfunction in a man with diabetes is rarely one problem, and identifying which combination of vascular, neurological, hormonal and medication factors is at work is what determines whether a treatment is likely to succeed. Options are explained with time for questions, and written informed financial consent is provided before any procedure.
Consultations are available at:
- Hornsby: Level 1, 51 Palmerton Road, Hornsby NSW 2077
- Castle Hill: 60 Cecil Avenue, Castle Hill NSW 2077
- St Leonards: Level 3, Suite 11, North Shore Private Hospital, Westbourne Street, St Leonards NSW 2065
You can confirm Dr Katelaris’s registration and credentials on any of these independent profiles:
Further background is on the about Dr Phillip Katelaris page.
Frequently asked questions
Can diabetes cause erectile dysfunction?
Yes. Diabetes is one of the strongest risk factors for erectile dysfunction, damaging both the blood vessels that supply the penis and the nerves that trigger an erection. ED also tends to develop earlier in men with diabetes than in men without it.
Is erectile dysfunction from diabetes reversible?
Partly, depending on how much nerve and blood vessel damage has occurred. Improving blood sugar control, blood pressure, weight and smoking status can improve erectile function, particularly when ED is recent. Where damage is established, treatment focuses on restoring function rather than reversing the cause.
Why don’t ED tablets work as well if I have diabetes?
Tablets need reasonably intact nerve signalling and reasonable blood flow to do their job, and diabetes can affect both. They still work for plenty of men with diabetes, just less reliably. Injection therapy uses a different mechanism, so it often works when tablets do not.
Can I have a penile implant if I have diabetes?
Yes. Men with diabetes are among the most common recipients of penile implants, because diabetic ED often does not respond to other treatments. Most surgeons work to improve blood sugar control before surgery, and suitability is assessed individually.
Does diabetes medication cause erectile dysfunction?
Diabetes medications themselves are not typical causes of ED. Some medications commonly taken alongside them, particularly certain blood pressure medications, can contribute. Never stop a prescribed medication without speaking to your doctor first.
Book a consultation
If erectile function has changed and you have diabetes, an assessment is worth more than another script. Contact Katelaris Urology on (02) 9477 7904 to arrange a consultation at Hornsby, Castle Hill or St Leonards. A GP referral is needed to claim a Medicare rebate.
Further reading
Medical references
- Diabetes Australia. Diabetes and sexual health
- Diabetes Australia. The effects of medications on erectile dysfunction
- Healthy Male (Australian Government funded). Erectile dysfunction: causes, diagnosis and treatment
- Healthdirect Australia. Erectile dysfunction
- Urological Society of Australia and New Zealand (USANZ) and Australasian Chapter of Sexual Health Medicine. Clinical guidelines on the management of erectile dysfunction. Medical Journal of Australia 2022;217(6).
- Cleveland Clinic. Erectile dysfunction: causes, diagnosis and treatment
Disclaimer: Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner. This article is general information and is not a substitute for individual medical advice.
Dr Phillip Katelaris MED0001030858
