Erectile Dysfunction, PDE-5 Inhibitors & Erection Aids

What Is Erectile Dysfunction?

Erectile dysfunction is diagnosed when a man is regularly unable to achieve or maintain an erection firm enough for intercourse over a period of at least three months. Occasional erection difficulties — for example after a lack of sleep, alcohol consumption, or acute stress — are normal and not a sign of illness. The term "impotence" is still used colloquially, but in medical terminology it has largely been replaced by the more precise term "erectile dysfunction."

Estimates suggest that several million men in Germany are affected, with prevalence increasing markedly with age. Despite considerable distress, many affected men delay addressing the issue for a long time — which in turn delays early diagnosis and treatment.

Causes

The causes of erectile dysfunction are organic in roughly 70 to 80 percent of cases. Vascular causes are the most common: arteriosclerosis and high blood pressure damage the fine penile arteries and reduce blood flow into the erectile tissue. Diabetes mellitus impairs both blood vessels and nerve pathways. Other organic causes include testosterone deficiency and other hormonal disorders, neurological conditions such as multiple sclerosis or Parkinson's disease, nerve damage following prostate surgery or pelvic radiotherapy, and medication side effects — particularly from antihypertensives, antidepressants, and antiandrogens.

Psychological causes — including chronic stress, performance pressure, fear of failure, depression, and anxiety disorders — play a larger role especially in younger men, though they can occur at any age. In practice, mixed causes are common: an organic impairment creates fear of failure, which in turn intensifies the erection problems — a vicious cycle that needs to be deliberately broken.

Treatment Options at a Glance

Treatment depends on the underlying cause and severity. As a first step, lifestyle changes are recommended: weight loss, smoking cessation, regular physical activity, and better control of cardiovascular risk factors have all been shown to improve erectile function. Where psychological factors are involved, accompanying psychotherapy is advisable.

PDE-5 Inhibitors

PDE-5 inhibitors are the first-line medical therapy for erectile dysfunction and their effectiveness is well documented. They block the enzyme phosphodiesterase type 5, which breaks down the messenger cGMP responsible for relaxing the vascular smooth muscle in the penis. By inhibiting this enzyme, more cGMP is preserved, blood vessels dilate more readily, and blood flow into the erectile tissue improves. The best-known active substances are sildenafil, tadalafil, and vardenafil, which differ mainly in duration of effect and timing of intake.

Important: PDE-5 inhibitors only work in conjunction with sexual stimulation — they do not produce an automatic erection. Possible side effects include headache, facial flushing, indigestion, and nasal congestion; visual disturbances or cardiovascular problems occur rarely. In men with existing heart conditions, those taking nitrates, or those with certain pre-existing conditions, medical advice before use is essential, as combining PDE-5 inhibitors with nitrates can cause a dangerous drop in blood pressure. At low doses, PDE-5 inhibitors are also occasionally used to treat pulmonary hypertension.

Vacuum Pump

The vacuum pump is a non-invasive, drug-free erection aid. The penis is inserted into an airtight cylinder; the resulting negative pressure draws blood into the erectile tissue, and a constriction ring placed at the base of the penis then maintains the erection. It is particularly suitable for men for whom medical therapies are not an option or not sufficiently effective, and it is also frequently used in penile rehabilitation. Its limitations include a lack of spontaneity and, at times, a less natural feel to the erection.

Intracavernosal Self-Injection Therapy (ICI)

With intracavernosal self-injection therapy, the patient injects a vasodilating medication — most commonly alprostadil (prostaglandin E1), sometimes combined with other vasoactive substances — directly into the erectile tissue. The erection sets in within a few minutes and lasts 30 to 60 minutes, independent of sexual stimulation. The method is also effective in severe forms of erectile dysfunction where PDE-5 inhibitors do not provide sufficient response, and it plays a central role in penile rehabilitation after prostate surgery. The injection technique must first be learned under medical supervision; possible complications include local pain and — rarely, but requiring treatment — priapism (a painful, prolonged erection).

Penile Implant

When medical and conservative therapies have been exhausted, or in cases of severe ED following radical prostatectomy or Peyronie's disease, the hydraulic penile prosthesis is the most effective and durable solution. It is internationally regarded as the gold standard for treatment-refractory erectile dysfunction, with patient satisfaction rates above 90 percent in controlled studies. A distinction is made between semi-rigid implants — flexible rods that are positioned manually — and hydraulic three-piece systems, consisting of two erectile cylinders, a pump located in the scrotum, and a fluid reservoir behind the pubic bone, which produce a naturally functioning erection at the push of a button. The procedure is invasive and carries a risk of infection or mechanical complications, which is why specialized surgical experience is essential. At our practice, we perform implantation microsurgically, with particular focus on nerve preservation, aesthetics, and long-term function.

The choice of the appropriate erection aid is made on an individual basis, taking into account the medical circumstances, the severity of the ED, and the patient's personal preferences — always through shared decision-making with the treating specialist.