Erectile Dysfunction
Yohimbine, a bark extract, has been available for many years.
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Direct intracavernosal injection of recombinant VEGF protein or adenoviral VEGF that contains plasmids has shown dramatic results on cavernosography in animal models with arteriogenic, venogenic, and neural forms of ED. Burchardt et al identified VEGF 165 as the predominant isoform in the corpora cavernosa, as well as a novel splice variant. Although VEGF is a potent and important vascular regulator, it probably acts in conjunction with other vascular factors. Although a single-agent VEGF is unlikely to ever be used as monotherapy for ED, the research done into its actions represents an important step in understanding the normal and abnormal vascular physiology associated with ED. Before the advent of oral PDE5 inhibitors, various other oral medications were investigated for treatment of ED, including the following [86] : Adrenergic receptor antagonists (eg, phentolamine, yohimbine, and delequamine) Dopamine receptor antagonists (eg, apomorphine and bromocriptine) Although the AUA does not recommend the use of any of these agents, [1] several are worth reviewing briefly. It has both a central and a peripheral effect.
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Even in properly conducted, well-controlled studies, it is only slightly more
- Bremelanotide (Vyleesi) injection, approved for women, studied in men.
- Low-intensity pulsed ultrasound (LIPUS) as an alternative to shockwaves.
- Sildenafil topical gel formulation for localized effect.
- Carnitine supplementation for possible neuroprotective benefits.
- Addressing relationship conflicts through couples therapy.
- Saw palmetto is not effective for ED and may worsen it.
effective than placebo, and AUA guidelines do not recommend its use.
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[83, 84] No significant differences in the incidence of MI, myocardial ischemia, or postural hypotension has been reported. Angioplasty or stent placement may be used for ED due to focal atherosclerotic stenosis of arteries supplying the penis. In patients with ED due to veno-occlusive dysfunction, transcatheter embolization may be used to occlude venous leaks [4, 5, 6] An increasing array of medications is available to assist in the management of ED. New agents are still undergoing clinical testing, and more are in the early phases of development. Medications currently being developed include dopaminergic and melanocortin receptor agonists, second-generation phosphodiesterase 5 (PDE5) inhibitors, rho-kinase inhibitors, soluble guanylate cyclases, and maxi-k channel activators.
Hormone therapy
For any medication to be effective, the physiologic components involved in the erectile process must be functional. Serious impairments render the medication either completely or partially ineffective. In current practice, PDE5 inhibitors are the most commonly used treatment for ED. Sildenafil was the first in this series of PDE inhibitors; avanafil is the newest, having been approved by the US Food and Drug Administration (FDA) in 2012. In a study of 390 men with diabetes and erectile dysfunction, avanafil was found to be a safe and effective treatment as early as 15 minutes and more than 6 hours after dosing.
Low-intensity shockwave treatment (LISWT)
Guidelines from the American Urological Association (AUA) recommend offering PDE5 inhibitors as first-line therapy for ED unless the patient has contraindications to their use (eg, concurrent organic nitrate therapy). The AUA notes that insufficient evidence exists to support the superiority of any one of these agents over the others. [1] European guidelines suggest that the choice of drug (short- versus long-acting) depend on the frequency of intercourse (occasional use or regular therapy, 3-4 times weekly) and the patient’s personal experience. The AUA warns that PDE5 inhibitors can cause mild transient systemic vasodilation, which may be aggravated by alpha-blocking agents. Consequently, the guidelines advise that vardenafil and tadalafil, at any dose, and sildenafil at 50 mg and 100 mg doses should be administered with caution in patients who are taking alpha blockers. [1] Nevertheless, there has been a renewed interest in this
- ED treatments can improve overall quality of life.
- Open communication with healthcare providers is essential.
- Managing expectations is important for treatment success.
- Alternative treatments should be used with medical consultation.
agent, particularly when it is combined with an oral PDE5 inhibitor.
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Testosterone gels are available for daily topical use to treat male hypogonadism and have the advantage of minimizing the peaks and troughs associated with the use of injectable agents. However, these gels require daily application and are relatively expensive. Implantation of longer-acting testosterone pellets has become increasingly popular. The pellet is placed during an office visit. The advantage of this approach is the infrequency of pellet placement (only every 3-6 months).
Sildenafil (Viagra)
The use of exogenous androgens suppresses natural androgen production. Elevation of serum androgen levels has the potential to stimulate prostate growth and may increase the risk of activating a latent cancer. Periodic prostate examinations, including digital rectal examinations, prostate-specific antigen (PSA) determinations, and blood counts (ie, complete blood count [CBC]), are recommended in all patients receiving supplemental androgens. Obtaining a testosterone level during therapy is necessary for optimizing the dosage. The modern age of pharmacotherapy for ED began in 1993, when papaverine, an alpha-receptor blocker that produces vasodilatation, was shown to produce erections when injected directly into the corpora cavernosa.
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Soon afterward, other vasodilators, such as alprostadil (ie, synthetic PGE1) and phentolamine, [45] were demonstrated to be effective either as single agents or in combination. Alprostadil is the single agent most commonly used for intracavernosal injections. In a study of 683 men, 94% reported having pills to get her in the mood instantly erections suitable for penetration after alprostadil injections. [100] Self-injection of this and similar agents has been of enormous benefit because they represent an effective way to achieve adequately rigid erections for a wide variety of men who otherwise would be unable to do so. If the vasculature within the corpora cavernosa is healthy, intracavernosal injection therapy is almost always effective. [107] Yohimbine is a safe agent with few known adverse effects.
- Testosterone therapy if low hormone levels cause ED.
- Psychological counseling for psychological causes.
- Lifestyle changes: exercise, healthy diet, weight loss.
- Managing underlying conditions like diabetes and hypertension.
It is administered in a dosage of 5.4 mg (1 tablet) 3 times daily A sublingual formulation of apomorphine has demonstrated some benefit in ED.
| Treatment | How It Works | Suitable For |
|---|---|---|
| Cognitive Behavioral Therapy (CBT) | Addresses mental barriers to sex | Performance anxiety, depression |
| Mindfulness and Meditation | Reduces stress and performance anxiety | Situational ED |
| Sex Therapy | Improves communication and intimacy | Couple-related ED |
| Hypnotherapy | Alters subconscious triggers | Panic-related ED |
Apomorphine is not approved by the FDA for this indication.
| Remedy | Proposed Benefit | Scientific Evidence | Safety Profile |
|---|---|---|---|
| Ginseng | Boosts libido | Limited | Usually safe |
| Fenugreek | Enhances libido, testosterone | Limited | Generally safe |
| Maca Root | Improves sexual desire | Anecdotal | Safe when used appropriately |
| Tribulus Terrestris | Increases testosterone | Mixed results | Possible side effects |
Phentolamine is an alpha-receptor blocker that has not been approved by the
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In patients with ED that is refractory to therapy with oral PDE5 inhibitors, one of these agents can be combined with an injection of prostaglandin E1 (PGE1; alprostadil). [3] Gutierrez et al demonstrated that this combination was more effective than either one alone. [89] The combination of a PDE5 inhibitor with intraurethral PGE1 has also proved successful. Men who present with diminished libido and ED may be found to have low serum testosterone levels (hypogonadism). Hormone replacement may benefit men with severe hypogonadism and may be useful as adjunctive therapy when other treatments are unsuccessful by themselves.
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Libido and an overall sense of well-being are likely to improve when serum testosterone levels are restored to the reference range. [90, 91, 92, 93, 94, 95] However, a meta-analysis by Corona et al found that the positive effect of testosterone therapy on erectile function and libido was significance only in randomized controlled trials partially or completely supported by pharmaceutical companies. Meta-analyses suggest that the combination of testosterone and PDE5 inhibitors yields more effective results, but in noncontrolled versus controlled studies. However, adverse effects, especially in older frail men, require consideration. Replacement androgens are available in the following four forms: Oral therapy is rarely used; of the available approaches, it is the least effective and the most likely to be associated with hepatotoxicity, even though the risk is relatively small.
Other medicines
Parenteral therapy is the approach most likely to restore androgen levels to the reference range, but it requires periodic injections (usually every 2 weeks) to sustain an effective level. Measurement of peak and trough levels can help avoid symptomatic troughs and supernormal peak levels, though such measurement is rarely done in clinical practice. Typically, a level is obtained 1 week after an injection. Weekly fildena professional 100 injections using lower doses can be used to minimize the wide swings in blood levels noted with less frequent dosing. Skin patches deliver a sustained dose and are generally accepted by patients. FDA for the treatment of ED but has undergone limited clinical testing.
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However, careful instruction in how to perform the injections is essential. The dosage is adjusted so as to achieve an erection with adequate rigidity for no more than 90 minutes. An abnormal finding after biothesiometry testing has been suggested as an indicator of possible heightened sensitivity to intracavernosal injections, but this suggestion remains unproven. The main adverse effects of intracavernosal injection are as follows [100, 101, 102] : Development of scarring at the injection site Another option for ED involves the formulation of alprostadil (PGE1) into a small intraurethral suppository that can be inserted into the urethra (see the image below). In one study, the agent was effective in 65% of a selected group of men.
Surgical procedures
[103] Widespread application of intraurethral alprostadil has been limited by the system’s cost and its inability to provide rigid erections consistently. Intraurethral alprostadil may be effective in men who have vascular disease or diabetes or have undergone prostate surgery. Intraurethral alprostadil is a useful agent for men who do not want to use self-injections or for men in whom oral medications have failed. It has been successfully used together with PDE5 inhibitors in cases in which each agent alone failed. The most common is a painful erection and urethral burning, which occurs in fewer than 10% of patients.
Avanafil (Stendra)
A topical gel formulation of alprostadil for treatment of ED has been developed. [104] However, it has not been approved for use by the FDA. One area of research has involved the use of vascular endothelial growth factor (VEGF), an angiogenic growth factor and endothelial cell mitogen. VEGF is produced by vascular smooth muscle, endothelial, and inflammatory cells. It increases production of nitric oxide (NO), which results in improves endothelial function and blood flow in chronic ischemic disorders.