Erectile dysfunction is the inability to develop or maintain an erection that is rigid enough to allow penetration of the vagina, and therefore functional sexual intercourse. Generally, the term erectile dysfunction is applied if this occurs frequently (75% of the time) over a significant period if time (several weeks to months). If this is the case, the term impotence may also be used.
Apomorphine is a non-selective D1/D2 receptor agonist with moderate efficacy and good tolerability in the treatment of mild ED (80). Apomorphine can be administered via subcutaneous injection or sublingually. However, studies have shows a lower efficacy for apomorphine compared to oral sildenafil (81,82). Apomorphine has a set role in the management of PD for non-motor symptoms, and has been reported to cause spontaneous erections and possible hypersexuality in PD men (83,84). Its role in the management of ED has been postulated for men with PD but should be considered as an alternative to sildenafil.
Erectile dysfunction is common, increases with age, and is associated with multiple common medical problems. A variety of successful therapies exist for men with erectile dysfunction. The success of the therapies can vary with the cause of the erectile dysfunction. A stepwise approach to the treatment of ED allows one to identify the therapy that is effective and the least invasive for the individual. Oral therapy remains the first line medical therapy for ED, however, is effective overall in 40%-80% of individuals. For those individuals who cannot take PDE5 inhibitors or fail from an efficacy or side effect standpoint, a number of alternatives exist. Intracavernous injection therapy is the most effective therapy for ED, however, the invasive nature can affect compliance. Penile prosthesis is a highly effective surgical procedure, but men undergoing placement of a penile prosthesis should be aware of the benefits and risks associated with placement of a penile prosthesis. Other surgical therapies, such as arterial surgery, are rarely needed.
Because impotence can be due to health problems that can affect the whole body, and because it can interfere with one’s quality of life, it is important to talk with your doctor if you have trouble attaining or maintaining an erection. With increasing discussion of impotence in the media, coupled with advances in treatment, men are now much more comfortable talking with their doctors about impotence. It is currently estimated that between 15 and 30 million men in the United States are affected by impotence (Source: NIDDK).
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In comparison, 37% of men who had received external radiotherapy as their primary therapy reported the ability to attain functional erections suitable for intercourse, along with 43% of men who had received brachytherapy as primary treatment. Pretreatment sexual health-related quality of life score, age, serum prostate-specific antigen (PSA) level, race or ethnicity, body mass index, and intended treatment details were associated with functional erections 2 years after treatment. 
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The physical side effects of chemotherapy are usually temporary and resolve within one to two weeks after stopping the chemotherapy. However, chemotherapy agents, such as Ciplatin or Vincristine, may interfere with the nerves that control erection leading to possible impotence. Make sure you discuss potential side effects of cancer chemotherapy with your doctor or healthcare provider.
Medical conditions, such as hypertension, diabetes mellitus, and cardiovascular disease (CVD), and psychological conditions, such as depression and anxiety, also contribute to sexual dysfunction in middle-aged or elderly men. CVD and hypertension cause a narrowing and hardening of the arteries, leading to reduced blood flow to the corporal bodies, which is essential for achieving an erection. Diabetes is a common aetiology of sexual dysfunction, because it can affect both the blood vessels and the nerves that supply the penis. Men with diabetes are four times more likely to experience ED, and on average, experience ED 15 years earlier than men without diabetes.7 Obesity is also correlated to the development of several types of dysfunction, including a decrease in sex drive and an increase in episodes of ED.8
One must be very careful using both PDE5 inhibitors and medications commonly used to treat an enlarged prostate, alpha-blockers (for example, tamsulosin [Flomax], terazosin [Hytrin]). It is recommended that one be on a stable dose of the alpha-blocker prior to starting a PDE5 inhibitor and that one start on a low dose of the PDE5 inhibitor and increase as tolerated and needed to treat the erectile dysfunction. Similarly, if you are on a PDE5 inhibitor and your doctor recommends that you start an alpha-blocker for your prostate, you should start at a low dose and increase as tolerated and needed to treat your prostate symptoms.
These are not currently approved by the FDA for ED management, but they may be offered through research studies (clinical trials). Patients who are interested should discuss the risks and benefits (informed consent) of each, as well as costs before starting any clinical trials. Most therapies not approved by the FDA are not covered by government or private insurance benefits.