The common PDE5 inhibitor drugs approved in the United States are sildenafil (Viagra), vardenafil (Levitra and Staxyn, the generic form), tadalafil (Cialis), or avanafil (Stendra). All of the currently approved PDE5 inhibitors work in the same way. They differ in the number of available doses, how quickly they work and last in your system, the dosing, and to some extent in the side effects. However, they generally share the same indications and contraindications. Currently, tadalafil is the only medication that patients can take on a daily basis and is approved for the treatment of both ED and BPH (benign enlargement of the prostate).
The association between psychiatric conditions and sexual dysfunctions, including ED, is well known. Data from population-based studies demonstrate a cross-sectional association between depressive symptoms and ED (65-68) and, among men seeking medical care for ED, depression is significantly associated with a greater severity of the impairment in erectile function (69,70). A meta-analysis of the available prospective studies has shown the role of depression as a significant risk factor for development of ED (71). However, the relationship seems to be bidirectional, as also ED has been associated with the occurrence of depression (72). In addition, treatment with PDE5i is related with an improvement in depressive symptoms (72). Most of this evidence comes from studies not specifically designed for the assessment of this relationship in younger men. However, few studies available in younger populations seem to confirm these results. In an internet-based survey, involving more than 800 North American medical students with a mean age of 25.7 years, ED was reported by 13% of them and it showed a significant association with depressive symptoms, whose frequency got higher as a function of ED severity (73). In a population of more than 2,500 very young Swiss men, aged 18–25 years, participating to a survey on sexual function while attending the medical screening for the evaluation of military capability, ED had a prevalence of 30%. Among the possible correlated conditions, mental health showed an independent association, besides the use of medications without medical prescription, a shorter sexual lifespan and impaired physical health (74). The results from this Swiss study were then prospectively extended on a sample of 3,700 men evaluated at baseline and 15.5 months later (75). Among a number of different possible predictors, including life-style, drug abuse, perceived physical fitness and BMI, only perceived impairment in mental health and depression, either newly occurred or continuously present, were associated with both persistence and development of ED (75). In a retrospective population-based study from Finland, involving almost 3,500 men aged 18–48 years, the role of depression as a significant predictor for ED was confirmed, but this study also showed that anxiety plays a significant role and that ED is significantly less frequent in men with a longer lasting sexual life, thus underlining the positive role of sexual experience and self-confidence (76). Anxiety is often involved in the pathogenesis of ED at the beginning of sexual life. In fact, anxiety can lead to an excessive focus on quality of erection, thus providing a cognitive distraction that negatively affects the arousal and consequently the erection itself (77-79). On the other hand, anxiety can result from one or more sexual failures, with loss of sexual confidence, increasing fears and avoidance for sexual experiences that, in the end, lead to an increased probability of new failures, thus creating a vicious circle (77). Cognitive distraction could be also provided by excessive worry for physical, and in particular genital, self-image. In fact, it has been proposed that when most mental energy is focused on monitoring body, psychological resources are distracted from sex, resulting in an impaired functioning (80,81). In line with this cognitive explanation, a recent study conducted on 367 military personnel younger than 40 years showed that a deteriorated genital self-image is associated with sexual anxiety which, in turn, is associated with a higher probability of sexual dysfunction (82).
Ageing is one of the most important unmodifiable risk factors for the development of metabolic disorders and CV diseases. Accordingly, the common algorithms for the estimation of risk of forthcoming diabetes or CV events include age as a factor of the equations (24-29). The weight attributed to age for estimating the risk in these equations is often so significant that younger men are automatically considered at low risk, irrespective of the other possible risk factors. However, even in younger subjects, overlooking the contribution of cardio-metabolic factors to pathogenesis of ED is a mistake that can lead to the loss of the opportunity of early recognition of patients who deserve a change in life-style or a pharmacological correction of risk factors. ED, besides being considered one of the clinical manifestations of metabolic and cardiovascular diseases (CVD), is regarded as an early marker of CV events (17). In fact, according to Montorsi’s hypothesis (30), impairment of penile artery blood flow occurs before that of coronary or carotid arteries, whose diameter is greater and needs longer time to acquire a clinically relevant damage. The clinical consequence of this pathological event is that ED often manifests earlier than myocardial infarction or stroke. In particular, it has been demonstrated that ED occurs on average three years before the first major adverse CV event (MACE) (31). Quite surprisingly, although CV risk increases with ageing, the role of ED as a harbinger of forthcoming MACE becomes progressively less evident. Data derived from almost 2,500 community-dwelling men aged 40–79 years, involved in the Olmsted County study show that ED is associated with an almost 50-fold higher risk of incident heart diseases in men aged 40–49 years, whereas the difference in risk between ED and non-ED men progressively declines in older men (32). The different CV risk associated with ED in different age bands has been confirmed by the meta-analysis of the available longitudinal studies (33). These observations suggest that, in younger men, the role of ED as a marker of CV risk is even more dramatic than in older ones and as a consequence, investigating the presence of metabolic or CV conditions in younger ED patients is pivotal for identifying men in whom an early life-style modification may avoid serious CV consequences. Even more than erection during sexual intercourse, erection during masturbation is considered a physiologic function that mirrors metabolic and CV health. In fact, erections during masturbation are far less affected by relational and psychological components than sex-related ones (34). In a population of subjects attending the Sexual Medicine and Andrology Unit of the University of Florence for sexual dysfunction, more than 2,500 men reported autoeroticism in the previous 3 months. Among these men, the impairment of erection during masturbation was associated with family and personal history of CVD (35), as well as with impaired response to the test with the intracavernous injection (ICI) of prostaglandin E1, which suggests an arteriogenic damage of penile arteries and predicts forthcoming MACE (36). For a subset of these men (n=862), information on the occurrence of MACE during a mean follow-up of 4.3 years was available and those who reported impaired erections during masturbation had a significantly higher incidence of MACE (35). However, when considering separately younger and older men, this association was confirmed only in younger ones, and it was still significant after excluding men reporting severe ED during masturbation (35). This suggests that the impairment of erection during masturbation is a symptom not completely overlapping with sex-related ED and that it can provide different and supplementary information, in particular when assessed in younger and apparently healthy men. Similarly to what is observed for erection during masturbation, acceleration of blood in penile arteries, as measured by the colour Doppler ultrasound in flaccid conditions, is associated with an adverse CV profile in men consulting for ED. A reduction in flaccid acceleration, which can be used by clinicians to objectively verify the arteriogenic origin of ED and to characterize the extent of a self-reported symptom, has been also associated with a future risk of CV events, with the association being significant in younger but not in older men (37).
If you suffer from erectile dysfunction and you can’t blame it on underlying health conditions, you might feel like your problems are all in your head. While psychological issues may be at the root of your problem, they are just as valid as many physiological causes for ED. Keep reading to learn more about the psychological causes of ED and what you can do to resolve them.
Intraurethral alprostadil (Muse) provides a less invasive alternative to intrapenile injection. It is a pellet that is inserted 5–10 min before intercourse, and its effects last for 1 h. The response rate is ∼50–60%. It can be used twice daily but is not recommended for use with pregnant partners. Complications of priapism and penile fibrosis are less common than after alprostadil given by penile injection. The cost is ∼$18–24 per treatment.
If the patient complains of loss of sensation on his penile shaft or glans, it is useful to perform hot and cold perception testing and/or additional vibratory sensory testing with biothesiometer. These are tests that can be performed quickly during the office visit and provide useful information about the function of the dorsal nerve of the penis (Table 3).

Injury to the penis may cause the scar tissue to develop. Sex, sports, or an accident might cause the injury. However, most patients don’t remember any painful injury. There are risk factors that increase the chances that an injury may cause scar tissue. They are genetics, connective tissue disorders, and age. The risk of Peyronie’s increases with age.
Instead of injecting a medicine, some men insert a suppository of alprostadil into the urethra. A suppository is a solid piece of medicine that you insert into your body where it dissolves. A health care professional will prescribe a prefilled applicator for you to insert the pellet about an inch into your urethra. An erection will begin within 8 to 10 minutes and may last 30 to 60 minutes.
Cardiovascular diseases: The most common cause of cardiovascular diseases in the United States is atherosclerosis, the narrowing and hardening of arteries that reduces blood flow. Atherosclerosis (a type of vascular disease) typically affects arteries throughout the body; hypertension, high blood cholesterol levels, cigarette smoking, and diabetes mellitus aggravate atherosclerosis. Hardening of the arteries to the penis and pelvic organs, atherosclerosis, causes insufficient blood flow into the penis. There is a close correlation between the severity of atherosclerosis in the coronary arteries and erectile dysfunction. For example, men with more severe coronary artery atherosclerosis (hardening of the arteries in the heart) also tend to have more erectile dysfunction than men with mild or no coronary artery atherosclerosis. Some doctors suggest that men with new onset erectile dysfunction undergo evaluation for silent coronary artery diseases (advanced coronary artery atherosclerosis that has not yet caused angina or heart attacks).

No matter what the cause of erectile dysfunction, it is likely to cause feelings of stress and other emotional reactions. It’s also not uncommon for erection problems to cause tension in a relationship, particularly if one or both partners withdraws emotionally and the problem is not talked about. And it’s possible for a man’s renewed ability to have intercourse after a period of no sexual activity to stir up relationship issues.


Phosphodiesterase inhibitors: This class of medications includes sildenafil, tadalafil, and vardenafil. They work by inhibiting an enzyme called phosphodiesterase type 5 (PDE-5), allowing more blood to enter the penis and helping to produce an erection. These medications are often taken before sex and will cause an erection only when the man is sexually stimulated.
Poor sleep patterns can be a contributing factor for erectile dysfunction, Mucher says. One review published in the journal Brain Research emphasized the intricate relationship between the level of sex hormones like testosterone, sexual function, and sleep, noting that testosterone levels increase with improved sleep, and lower levels are associated with sexual dysfunction. Hormone secretion is controlled by the body’s internal clock, and sleep patterns likely help the body determine when to release certain hormones. 
Getting (and maintaining) an erection requires a surprising amount of things to go right. You have to get aroused, then pass that signal from your brain, through your nerves and hormones, to your blood vessels and muscles before an erection can even happen. If one thing goes wrong in that complicated exchange between your cardiovascular, and nerve system, and your hormone levels, blood vessels, and even your mood the result is usually erectile dysfunction. In other words, getting an erection is hard.
Quitting smoking, exercising regularly, losing excess weight, curtailing excessive alcohol consumption, controlling hypertension, and optimizing blood glucose levels in patients with diabetes are not only important for maintaining good health but also may improve or even prevent progression of erectile dysfunction. It is unclear if such lifestyle changes can reverse erectile dysfunction. However, lifestyle improvements may prevent progression of the erectile dysfunction. Some studies suggest that men who have made lifestyle improvements experience increased rates of success with oral medications.
Erectile dysfunction is no laughing matter. And although it is not an easy thing to talk about, there are trained professionals who can give you good advice about what may be the cause of your current predicament. Many men like to talk about sex, but like women, they may find it harder to talk about sex when it is not going well. You won’t be judged or talked about at BPAS. We are here to help you with some of the more private things in life.
The second option is a prosthesis or penile implant:  a kind of hydraulic device surgically implanted in the penis. The prostheses consist of two rods that fit inside the penis, a pump that sits inside the scrotum next to the testicles, and a little reservoir that houses fluid that sits under the groin muscles.  When a person wants to be intimate, they pump up the prostheses; afterward, they can use a button to reverse it.
Your ability to orgasm is not connected to the prostate gland, although a man who has had a radical prostatectomy will have a dry orgasm with no ejaculation. As long as you have normal skin sensation, you should be able to have an orgasm with the right sexual stimulation. This means that treating your ED should allow you to resume a normal, healthy sex life.

Alprostadil is injected into the side of penis with a very fine needle. It's of great value to have the first shot in the doctor's office before doing this on your own. Self-injection lessons should be given in your doctor's office by an experienced professional. The success rate for getting an erection firm enough to have sex is as high as 85% with this treatment. Many men who do not respond to oral PDE5 inhibitors can be ‘rescued' with ICI.
Men with diabetes are at a higher risk of erectile dysfunction or impotence, especially if their diabetes is not well controlled. Erectile dysfunction means you cannot have an erection that is sufficient to perform sexual intercourse. Many men experience short-term episodes of erectile dysfunction but, for about one in 10 men, the problem may continue.
The improvement of both man and woman sexual function in couples whose male partner is treated with PDE5i has been further confirmed by randomized clinical trials (RCTs) comparing the effectiveness of PDE5i vs. placebo in improving couple sexual function (91-95). In a more recent RCT, the use of vardenafil 10 mg oral dispersible tablets has been compared to the use of the drug itself in association with cognitive behavioral sexual therapy (CBST) for 10 weeks in 30 couples with ED male partners, randomly assigned to one study arm (96). Results from this RCT showed that vardenafil is able to improve male sexual function, but this improvement is maintained only in patients receiving both vardenafil and CBST. Furthermore, female sexual function and satisfaction are enhanced only in the arm with vardenafil and CBST combined therapy, thus suggesting that a therapy healing the couple is more effective and has a longer-lasting efficacy than the use of a medication focusing only on ED.

Erectile dysfunction is a condition in which a man is unable to achieve an erection sufficient for sexual intercourse. In some cases the man is able to achieve an erection but unable to maintain it long enough to complete the sex act. Most men experience erectile difficulties at some point in their lives, but this is different from ED. According to the Mayo Clinic, those with ED will fail to achieve an erection at least 25 percent of the time. ED has several causes and alcohol consumption can be one of them.
Care for these patients, who in many cases are emotional, demanding, and time consuming, may evoke feelings of frustration and anticipatory anxiety in the time-strapped urologist. Early in the encounter, the urologist must understand the patient’s psychosocial environment and establish a rapport and meaningful alliance with the patient and his family, if present (13). It is important to ensure that the doctor-patient interaction is informative and task oriented for greater patient buy-in and compliance with treatment (13,14). Affirm to the patient that regardless of the short time allotted for the visit that the doctor-patient relationship will endure even after the visit. This may be accomplished through a scheduled follow-up telephone call, electronic message, follow-up clinic visit, or a written letter. It may also be beneficial to refer the patient to a sex therapist or counselor though many young men will reject the idea that there is a psychosocial element to their ED and may refuse to consider therapy.

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Cultivating and maintaining a healthy relationship is not easy. It takes time to truly get to know someone and to trust them. If you and your partner are experiencing trouble with your relationship, it could very well bleed over into your sex life. It could also be the case that your erectile dysfunction is creating problems in the relationship – it is another example of the cycle of ED that can affect many different aspects of your life. Communication is the first step in resolving this particular cause for psychological ED but it is also one of the most difficult steps to take.

Some men should not take PDE5 inhibitors. They can cause hypotension (abnormally low blood pressure that can lead to fainting and even shock) when given to patients who are taking nitrates (medications taken for heart disease). Therefore, patients taking nitrates daily should not take any of the PDE5 inhibitors. Nitrates relieve angina (chest pain due to insufficient blood supply to the heart muscle because of narrowing of the coronary arteries); these include nitroglycerine tablets, patches, ointments, sprays, and pastes, as well as isosorbide dinitrate and isosorbide mononitrate. Other nitrates such as amyl nitrate and butyl nitrate also are in some recreational drugs called "poppers."


Prevention of some of the causes that contribute to the development of erectile dysfunction can decrease the chances of developing the problem. For example, if a person decreases their chances of developing diabetes, heart disease, and hypertension, they will decrease their chances of developing erectile dysfunction. Other things like stopping smoking, eating a healthy diet (heart healthy with adequate vitamin intake), and exercising daily may reduce a person's risk.
"We used to think that ED in young men was 90 percent psychological, but we now know that most cases are caused by a combination of risk factors. Erectile function depends on hormones, blood supply, nerve function, and psychological health,” said Run Wang, MD, professor of urology at The University of Texas Health Science Center in Houston and director of sexual medicine at MD Anderson Cancer Center.
The various PDE5 inhibitors for the treatment of ED share several common side effects, including headache, flushing, nasal congestion, nausea, dyspepsia (stomach discomfort), and diarrhea. Differences exist in side effects of the different PDE5 inhibitors, and thus it is important to be familiar with the prescribing information of the PDE5 inhibitor you are prescribed.
There are two kinds of surgery for ED: one involves implantation of a penile prosthesis; the other attempts vascular reconstruction. Expert opinion about surgical implants has changed during recent years; today, surgery is no longer so widely recommended. There are many less-invasive and less-expensive options, and surgery should be considered only as a last resort.
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