Men with a rare heart condition known as long QT syndrome should not take vardenafil since this may lead to abnormal heart rhythms. The QT interval is the time it takes for the heart's muscle to recover after it has contracted. An electrocardiogram (EKG) measures the QT interval. Some people have longer than normal QT intervals, and they may develop potentially life-threatening abnormal heart rhythms, especially when given certain medications. Men with a family history of long QT syndrome should not take vardenafil, as it is possible to inherit long QT syndrome. Furthermore, vardenafil is not recommended for men who are taking medications that can affect the QT interval such as quinidine (Quinaglute, Quinidex), procainamide (Pronestyl, Procan-SR, Procanbid), amiodarone (Cordarone), and sotalol (Betapace).
The first is a vacuum erection device (VED).  The device, which can be purchased on line and used at home, is placed over the penis, then pumped up to create a vacuum around the penis. This draws blood into the penis, creating an erection. One study found that the dropout rate with the VED was quite high, with only 50% of couples finding the treatment satisfactory. 2
With coronary artery disease, a buildup of plaque inside the arteries can limit the amount of blood that’s able to flow through them. If the flow of oxygen-rich blood to your heart muscle is reduced or blocked by this hardening of the arteries, the result can be angina (chest pain) or a heart attack.17 Because the arteries that supply blood to the penis are much smaller than the ones that feed the heart, the problem may show up earlier as having difficulty getting an erection.18
Booze. Most men have learned: One too many cocktails doesn’t improve performance; instead, it can have the opposite effect. During a recent study of 1,506 Chinese males, the men who drank three or more drinks a week were more likely to have ED or some form of sexual dysfunction. “Men may find that alcohol decreases social inhibition, which makes it easier to approach a woman,” says Montague. “But alcohol is a depressant, and at higher quantities it can reduce both a man’s desire and ability to perform.”
Aging: There are two reasons why older men are more likely to experience erectile dysfunction than younger men. First, older men are more likely to develop diseases (such as heart attacks, angina, cardiovascular disease, strokes, diabetes mellitus, and high blood pressure) that are associated with erectile dysfunction. Second, the aging process alone can cause erectile dysfunction in some men by causing changes in the muscle and tissue within the penis.
Another common reason for failures of oral therapy is the absence of sexual or genital stimulation prior to attempting sexual intercourse. These medicines facilitate an erection by increasing blood flow to the penis, but they do not act as an aphrodisiac or as an initiator of the erection. A man who is not “in the mood” or does not have adequate physical stimulation will not respond with an erection.
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.
Erections also require neural input to redirect blood flow into the corpora cavernosae. Psychogenic erections secondary to sexual images or auditory stimuli relay sensual input to the spinal cord at T-11 to L-2. Neural impulses flow to the pelvic vascular bed, redirecting blood flow into the corpora cavernosae. Reflex erections secondary to tactile stimulus to the penis or genital area activate a reflex arc with sacral roots at S2 to S4. Nocturnal erections occur during rapid-eye-movement (REM) sleep and occur 3–4 times nightly. Depressed men rarely experience REM sleep and therefore do not have nocturnal or early-morning erections.
Occasional difficulties in bed do not constitute ED – it is the persistent and consistent inability to maintain an erection through satisfactory intercourse. It is more common than men might think, given that they are loath to discuss it with others, often even their doctors. The condition has many causes and, as a result, affects men of all ages – though it becomes increasingly prevalent with age.
Smoking.   Smoking and erectile dysfunction are related as smoking leads to plaque build up in the arteries called cardiovascular disease, which restricts blood flow through the veins.  Arterial sclerosis from smoking restricts blood flow, and thus can prevent the massive amount of blood required for you to achieve an eretion, resulting in erectile dysfunction.
What young men should not do is take an ED drug like Viagra without a prescription, or mix them with other drugs. “This is a huge problem and not a safe practice,” says Penny Kaye Jensen, PhD, president of the American Academy of Nurse Practitioners. “Some young men are mixing ED drugs with mind-altering drugs, such as ecstasy or crystal methamphetamine. This is on the rise and is a potentially deadly combination.”

Studies show that high cholesterol and obesity are linked to erectile dysfunction, and both can be improved through diet. "A heart-healthy diet that prevents cardiovascular disease and maintains a healthy weight is also good for erectile functioning," says Feloney. An ideal diet plan involves eating foods low in saturated fat and cholesterol and having frequent servings of fruits, vegetables, and plenty of whole grains.
Currently, placement of a penile prosthesis is the most common surgical procedure performed for erectile dysfunction. Penile prosthesis placement is typically reserved for men who have tried and failed (either from efficacy or tolerability) or have contraindications to other forms of therapy including PDE5 inhibitors, intraurethral alprostadil, and injection therapy.

Qaseem, A., Snow, V., Denberg, T. D., Casey, D. E., Forciea, M. A., Owens, D. K., & Shekelle, P. (2009). Hormonal testing and pharmacologic treatment of erectile dysfunction: A clinical practice guideline from the American College of Physicians. Annals of internal medicine, 151(9), 639-649. Retrieved from http://annals.org/aim/article/745155/hormonal-testing-pharmacologic-treatment-erectile-dysfunction-clinical-practice-guideline-from
“I’d like to say that men are regularly screened for ED, but when it comes to busy doctors taking care of patients with diabetes, sexual function tends to fall lower on the list of complications,” said Stan Honig, MD,  Director of Men’s Health, Yale School of Medicine. “I’d like to think that every doctor asks every man about sexual function, but I don’t think that’s the case.”

Acupuncture may help treat psychological ED, though studies are limited and inconclusive. You’ll likely need several appointments before you begin to notice any improvements. When choosing an acupuncturist, look for a certified practitioner who uses disposable needles and follows U.S. Food and Drug Administration guidelines for needle disposal and sterilization.
• Medications: About 25 percent of ED cases are caused by drugs. Many medications, including common medicines prescribed for diabetes and its complications, can cause ED. The most common offenders are blood pressure drugs, antihistamines, antidepressants, tranquilizers, appetite suppressants, and cimetidine (an ulcer drug). In addition, over-the-counter medications, including certain eye drops and nose drops, have been associated with ED. That does not mean you should stop taking these medications! Rather, you should discuss them with your doctor to determine whether a different dosage, an alternate medicine, or additional treatments will resolve the ED.
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