Excess alcohol causes erectile dysfunction in a variety of ways. Have one too many, and it decreases the production of NO in your penis, decreasing blood flow. It can even prevent the prescription pills from working. A little alcohol may get you aroused, but a lot actually blunts desire in your brain and can make it hard to reach climax as well. Over time excess alcohol damages the nerves to the penis that trigger an erection, and eventually, when the liver gets damaged, testosterone levels plummet. If you drink, practice moderation.


Monitoring erections that occur during sleep (nocturnal penile tumescence) can help you and your doctor to understand if the erectile dysfunction is due to psychological or physical causes. The nocturnal penile tumescence test is a study to evaluate erections at night. Normally men have three to five erections per eight hours of sleep. The test can be performed at home or in a sleep lab. The most accurate way to perform the test involves a special device that is connected to two rings. The rings are placed around the penis, one at the tip of the penis and the other at the bottom (base) of the penis. The device records how many erections occur, how long they last, and how rigid they are. The test is limited in that it does not assess the ability to penetrate.

Although ED and diabetes are two separate conditions, they tend to go hand in hand. Half of men with diabetes will experience ED within 10 years of their diagnosis.8 For some men, ED may be the first symptom of diabetes even if they have not yet been diagnosed, particularly in men younger than 45.6 Left untreated, ED can damage self-confidence and relationships.
The article, "Inactivation of phosphorylated endothelial nitric oxide synthase (Ser-1177) by O-GlcNAc in diabetes-associated erectile dysfunction," appears in the Aug. 16 issue of the Proceedings of the National Academy of Sciences and was published online Aug. 5.  Melissa F. Kramer and Robyn E. Becker, also of the Brady Urological Institute, collaborated on this study.
Erectile dysfunction is your body’s “check engine light” because ED can be an early sign of serious health problems like high blood pressure, diabetes, high cholesterol or low testosterone. The blood vessels in the penis are smaller than other parts of the body. So ED symptoms often occur long before more serious problems like a heart attack or stroke. When an otherwise healthy man in his 20’s experiences ED, it’s cause for concern.
Oral medicines: The best known ED medications are the Big Three: Viagra (sildenafil citrate, made by Pfizer, Inc.), Levitra (vardenafil HCl, made by Bayer and GlaxoSmithKline), and Cialis (tadalafil, made by Eli Lilly). The three are chemically very similar, and all have proven very effective. Because they are effective, convenient, and relatively inexpensive (about nine dollars per pill), these medicines have become the treatment of choice for most men experiencing ED.
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