Erectile Dysfunction
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What Is Erectile Dysfunction?

Erectile dysfunction (ED) is the persistent inability to achieve or maintain an erection firm enough for satisfactory sexual intercourse. While occasional difficulty is normal, ongoing ED affects over 50% of men over 40 in some form — and its prevalence increases with age, stress, and underlying health conditions.

ED is not something you have to accept. It's a treatable medical condition, and modern oral medications work for the vast majority of men. What many don't realize is that ED is often an early warning sign of deeper cardiovascular or metabolic issues — making evaluation and treatment even more important.

What Causes ED?

Erectile dysfunction is complex and frequently involves multiple contributing factors:

• Vascular (Blood Flow): Atherosclerosis, high blood pressure, and cardiovascular disease reduce blood flow to the penis. ED is one of the earliest clinical signs of endothelial dysfunction — often appearing 3–5 years before a cardiac event.
• Hormonal: Low testosterone, thyroid disorders, and elevated prolactin can all suppress sexual desire and erectile function. Hormone optimization is often a key part of comprehensive ED treatment.
• Neurological: Conditions affecting nerve signaling — diabetes, spinal cord injuries, multiple sclerosis, or post-surgical nerve damage — can impair the erectile reflex.
• Psychological: Performance anxiety, stress, depression, and relationship issues are major contributors, especially in younger men. The cycle of anxiety → ED → more anxiety can be particularly difficult to break without intervention.
• Medications & Lifestyle: Antidepressants (SSRIs), blood pressure medications, smoking, excessive alcohol use, poor sleep, and sedentary lifestyle all increase ED risk.

Treatment Options

Oral PDE5 inhibitors are the first-line treatment for erectile dysfunction. Your clinician will recommend the best option based on your lifestyle, frequency of use, and health profile:

How ED Medications Work

PDE5 inhibitors like Sildenafil and Tadalafil work by blocking the enzyme phosphodiesterase type 5 in the smooth muscle of the corpus cavernosum (erectile tissue). This enhances the natural nitric oxide → cGMP pathway that produces an erection:

• Sexual stimulation triggers nitric oxide (NO) release from nerve endings and endothelial cells in the penis.
• NO activates guanylate cyclase, increasing cyclic GMP (cGMP) — the molecule that relaxes smooth muscle and dilates penile arteries.
• PDE5 normally breaks down cGMP. By inhibiting PDE5, medications allow cGMP to accumulate, producing stronger and longer-lasting blood flow.
• The result: A firmer, more reliable erection in response to natural sexual arousal. These medications do not cause spontaneous erections — stimulation is still required.

ED vs. Low Libido — What's the Difference?

Erectile dysfunction is a mechanical issue — difficulty achieving or maintaining an erection despite sexual desire. Low libido is a desire issue — reduced interest in sexual activity altogether. They often coexist but have different underlying causes:

• Low testosterone is a leading cause of low libido in men, especially after age 30
• Stress, depression, and anxiety can suppress both desire and physical performance
• Medications (SSRIs, blood pressure drugs) frequently affect both libido and erectile function
• Relationship dynamics and psychological factors play a significant role in sexual desire

A comprehensive evaluation addresses both — combining ED medication with hormone optimization, lifestyle changes, or mental health support when needed.

How It Works — 3 Simple Steps

Side Effects & Safety

PDE5 inhibitors are well-studied and generally well-tolerated. Common side effects are usually mild and temporary:

• Headache (most common)
• Facial flushing
• Nasal congestion
• Indigestion / dyspepsia
• Dizziness
• Visual changes (blue-tinged vision, more common with sildenafil)

Important: PDE5 inhibitors must not be taken with nitrate medications (nitroglycerin, isosorbide) due to the risk of severe hypotension. Your clinician will screen for contraindications and drug interactions during your assessment.

Frequently Asked Questions