What is erectile dysfunction?
Erectile dysfunction (ED) is the persistent inability to achieve or maintain an erection firm enough for satisfactory sexual activity. Occasional difficulty is common and not considered ED — the diagnosis applies when the problem occurs consistently over several weeks or months and causes personal distress.
ED affects an estimated 30 million men in the United States. It becomes more prevalent with age, but it is not an inevitable consequence of aging. Younger men are affected too, particularly when anxiety, lifestyle, or hormonal factors are involved.
ED is often an early warning sign of cardiovascular disease, because the small blood vessels in erectile tissue are affected before larger vessels. This makes evaluation and treatment medically important beyond sexual function alone.
Signs and symptoms
ED presents consistently in a recognizable pattern:
What causes ED?
ED is almost always multifactorial. Common physical causes include:
- Vascular disease — reduced blood flow to the penis is the single most common cause, often linked to hypertension, high cholesterol, atherosclerosis, or smoking
- Diabetes — damages both blood vessels and the nerves that control erection
- Low testosterone (hypogonadism) — reduces libido and can impair erectile function
- Medications — beta-blockers, SSRIs, diuretics, finasteride, and many others can contribute
- Neurological conditions — multiple sclerosis, Parkinson’s disease, spinal cord injury
- Obesity and metabolic syndrome — strongly associated with ED at any age
Psychological causes — including performance anxiety, depression, relationship stress, and past trauma — are significant, especially in men under 40. Often physical and psychological factors reinforce each other.
ED is one of the most treatable conditions in medicine — and addressing it often reveals broader cardiovascular or hormonal health opportunities.
Can it be treated online?
ED is well-suited to telehealth for most men without serious cardiovascular disease. A clinician reviews your health history, current medications (particularly nitrates, which are contraindicated), blood pressure, and any relevant conditions before prescribing.
Telehealth is NOT appropriate if you take nitrates (nitroglycerin, isosorbide) for heart disease, have had a recent heart attack or stroke, have severely uncontrolled blood pressure, or have other complex cardiovascular conditions. For these situations, an in-person evaluation with your cardiologist or primary care provider is necessary first.
If the clinician suspects low testosterone, diabetes, or another underlying cause, they may recommend bloodwork to guide fuller treatment.
How ED is treated
First-line treatment for most men is a PDE5 inhibitor:
- Sildenafil (generic Viagra): taken 30–60 minutes before sexual activity; effective for 4–6 hours
- Tadalafil (generic Cialis): taken as needed (lasts up to 36 hours) or as a low daily dose (5 mg) for men who prefer spontaneity
- Vardenafil / Avanafil: alternatives with slightly different onset and duration profiles
These medications work by increasing blood flow to the penis in response to sexual stimulation — they do not cause erections on their own. Effectiveness is around 70% for most men with vascular ED.
When an underlying cause is identified — such as low testosterone or uncontrolled diabetes — treating that condition often improves ED as well. Lifestyle changes (weight loss, exercise, stopping smoking, reducing alcohol) have meaningful evidence for improving erectile function.
Lifestyle factors that matter
- Regular aerobic exercise — 30 minutes most days — improves vascular function and is one of the most effective evidence-based interventions for ED
- Weight loss of 10% or more in overweight men substantially improves erectile function
- Stopping smoking significantly reduces vascular damage over time
- Limiting alcohol to low-to-moderate levels; heavy drinking impairs sexual function acutely and chronically
- Managing stress and, where relevant, seeking support for performance anxiety or relationship issues
How long does treatment take?
PDE5 inhibitors work acutely within 30–60 minutes of a dose. However, some men find they need 2–3 doses before finding the right timing and dose for them. Daily tadalafil takes a few days to reach steady state. Underlying causes such as low testosterone may take weeks to months to show full benefit when treated.
Frequently asked questions
Can I get ED medication online?
Yes, for many men. A clinician reviews your health history, current medications, and cardiovascular risk factors before prescribing. PDE5 inhibitors are contraindicated with nitrates and in certain heart conditions, so a thorough intake is required.
Do I need bloodwork first?
Not always. For typical ED in otherwise healthy men, a thorough history is often sufficient. However, if low testosterone, diabetes, or thyroid issues are suspected, the clinician may recommend labs before or after prescribing.
What is the difference between sildenafil and tadalafil?
Sildenafil (Viagra) works for 4–6 hours and is taken as needed. Tadalafil (Cialis) lasts up to 36 hours and is also available in a low daily-dose form. The clinician will discuss which fits your situation.
Does ED always have a physical cause?
Not always. Psychological factors such as performance anxiety, stress, and depression contribute significantly, especially in younger men. Often it is a combination of physical and psychological factors. Treatment may address both.
Is it safe to take ED medication with blood pressure medication?
Many combinations are safe, but some blood pressure medications can interact with PDE5 inhibitors to cause a significant drop in blood pressure. Always disclose all medications in your intake form so the clinician can assess safety.
