Diabetes mellitus: Erectile dysfunction tends to develop 10 to 15 years earlier in diabetic men than among nondiabetic men. The increased risk of erectile dysfunction among men with diabetes mellitus may be due to the earlier onset and greater severity of atherosclerosis (hardening of the arteries) that narrows the arteries and thereby reduces the delivery of blood to the penis. Atherosclerosis can affect the arteries in the penis, as well as the arteries in the pelvis that supply the penile arteries. Diabetes mellitus also causes erectile dysfunction by damaging nerves that go to the penis, much like the effect of diabetes on nerves in other areas of the body (diabetic neuropathy). Diabetes can also affect the muscles in the penis, leading to troubles with erections. Smoking cigarettes, obesity, poor control of blood glucose levels, and having diabetes mellitus for a long time further increase the risk of erectile dysfunction in people with diabetes.
^ Latini, DM; Penson, DF; Colwell, HH; Lubeck, DP; Mehta, SS; Henning, JM; Lue, TF (Nov 2002). "Psychological impact of erectile dysfunction: validation of a new health related quality of life measure for patients with erectile dysfunction". Journal of Urology. 168 (168(5)): 2086–91. doi:10.1097/01.ju.0000034365.57110.b7 (inactive 2019-02-16). PMID 12394715.
If you’re taking medication to treat blood pressure, depression, pain, allergies, inflammation, seizures, or heart conditions, you’re one of the tens of millions of people at risk for medically induced erectile dysfunction. It’s just the nature of drug side effects. Yet erectile dysfunction is one of the least talked about side effects of prescription medication.

Poor lifestyle habits, such as a terrible diet and lack of exercise, may result in having to take medication. Some of these can interfere with how your penis works. For example, blood pressure medication reduces blood flow to the penis, which can cause erectile dysfunction. This results in a lower sexual arousal and poor sexual performance, says the National Library of Medicine.
A physical cause can be identified in about 80% of cases.[1] These include cardiovascular disease, diabetes mellitus, neurological problems such as following prostatectomy, hypogonadism, and drug side effects. Psychological impotence is where erection or penetration fails due to thoughts or feelings; this is somewhat less frequent, in the order of about 10% of cases.[1] In psychological impotence, there is a strong response to placebo treatment.
The impact of malignancy and its treatment on both the individual and his or her partner can have a significant negative influence on their sexual relationship. Many of the cancer treatments can lead to sexual dysfunction. As common examples, long-acting gonadotrophin-releasing hormone agonists used for prostate and breast cancer result in hypogonadism, with subsequent reduction in sexual desire, erectile dysfunction in men42, vaginal atrophy and dyspareunia in women as well as orgasmic dysfunction.34
These medications work in pretty much the same way. They all increase blood flow to the penis, but they only work if you’re sexually aroused. These treatments are only right for you if you experience erectile dysfunction often and a doctor agrees they’re safe for you. A good option to choose could be ‘on demand’ Cialis (tadalafil), as it takes around 30 minutes to take effect and then can last up to 36 hours. 
Once evaluated, there are a number of treatments for erectile dysfunction, varying from oral therapies that can be taken on demand (for example, sildenafil [Viagra, Revatio], vardenafil [Levitra, Staxyn], avanafil [Stendra], and tadalafil [Cialis, Adcirca]) or once daily (tadalafil), intraurethral therapies (alprostadil [Muse]), injection therapies (alprostadil, combination therapies), the vacuum device, and penile prostheses. Less commonly, arterial revascularization procedures can be performed. It is important to discuss the indications and risks of each of these therapies to determine which is best for you.
The penis is composed of three cylinders: two on the top, the corpora cavernosa and one on the bottom, the corpus spongiosum. All of these are involved in the process of an erection. The corpora cavernosa are composed of potential spaces that can distend with blood, causing rigidity of the penile shaft. The corpus spongiosum is important for rigidity of the glans of the penis. When aroused, stimulated chemicals are released from the nervous system (nitric oxide is one) that stimulate the arteries to the penis to relax and increase blood flow into the penis. These potential spaces, like a sponge, can expand when more blood flow comes in the penis. Each corpora cavernosa is surrounded by an outer coating the tunica albuginea. When the penis fills with blood, these potential spaces, the sinusoids, compress the veins in the corpora against the side of the tunica albuginea, thus preventing blood from leaving the penis. It is this compression of the veins that allows for the erection to become fully rigid.
In prescribing sildenafil, a doctor considers the age, general health status, and other medication(s) the patient is taking. The usual starting dose for most men is 50 mg, however, the doctor may increase or decrease the dose depending on side effects and effectiveness. The maximum recommended dose is 100 mg every 24 hours. However, many men will need 100 mg of sildenafil for optimal effectiveness, and some doctors are recommending 100 mg as the starting dose.
The longer a man has had diabetes, the more likely it is that he'll develop ED, especially if his blood glucose levels have not been well controlled. Complications of accompanying heart diseases such as high blood pressure and high cholesterol also can play a role in impotence. A man with diabetes who also smokes increases his risk of developing ED.

Having learned a great deal more about erectile dysfunction including its risk factors and causes, you should be equipped to assess your own erectile function. If you have experienced erectile issues or you have some of the risk factors mentioned above, it may be worth making a trip to your doctor’s office. If you choose to seek help, give your doctor as much information as you can about your symptoms including their frequency and severity as well as the onset. With your doctor’s help, you can determine the best course of treatment to restore sexual function.
Do you have a couple of hours, or longer? The list of medications that cause erectile dysfunction (ED), or problems getting and maintaining an erection during sex, are long and varied. While there's no way to mention all the chemical culprits, let's start with a few of the common ones: Over-the-counter antihistamines for allergies and other conditions. Tranquilizers and antidepressants can also cause a bout of ED, which is why guys should take them only for a short time. Meds that treat high blood pressure and heart disease may help save your life but will compromise or kill your sex life. Radiation and chemotherapy medications for prostate, colon, and similar cancers also cause problems in the bedroom. And illicit drugs such as marijuana, cocaine, and heroin, which might make their users feel good for a while, will only cause them to crash in the bedroom.
The time the dose should be taken and how long the effects last depend on the medication used. The most common side effect of these medications is a headache. However, there is a potential for certain dangerous drug interactions. Anyone prescribed this medication must let his doctor know about any medications he's on, and especially if he's taking nitrates (e.g., nitroglycerin spray, nitroglycerin pills, or nitroglycerin patch) for heart problems.

But don’t panic. ED can be caused by a number of factors, from depression and medication side effects to high blood pressure, high cholesterol, low testosterone levels, Peyronie’s disease, nerve damage, performance anxiety, heart disease, diabetes, and more. Even better, many of these ED causes are treatable with medication and simple lifestyle changes. It’s important to know the root cause of your erectile dysfunction in order to treat it in the fastest, most effective way possible. Here are the 5 most common causes of erectile dysfunction.
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