Erectile dysfunction is common, and very treatable

How PDE5 inhibitors work

An erection happens when blood flows into the penis faster than it leaves. Sexual arousal releases nitric oxide, which raises a chemical messenger called cGMP. cGMP relaxes the smooth muscle in the penile arteries so they can fill with blood. An enzyme called PDE5 breaks cGMP down, which ends the erection.

PDE5 inhibitors block that enzyme, so cGMP sticks around longer and the blood-flow response is stronger. Two practical consequences follow:

• They need arousal to work. They don't cause an erection on their own. They amplify the body's normal response.
• They don't change desire. They don't raise libido or testosterone. Low desire is a different problem with different causes.

The four options at a glance

Four PDE5 inhibitors are FDA-approved for erectile dysfunction. They work the same way and are similarly effective. They differ mostly in timing.

"Lasts" means the window in which an erection is easier to get with arousal, not a constant erection. Full comparison →

ED can be an early warning sign

ED is common. In the long-running Massachusetts Male Aging Study, about half of men aged 40 to 70 reported some degree of it, and it becomes more common with each decade. But common doesn't mean it's just aging.

• It often shows up before heart disease. The arteries in the penis are smaller than the ones that feed the heart, so they can show narrowing years earlier. New ED, especially before 60, is a good reason to check blood pressure, cholesterol, and blood sugar. Heart & metabolic health →
• Diabetes is a major cause. It damages both blood vessels and nerves, and men with diabetes tend to respond less well to these pills.
• Low testosterone can play a part. Urology guidelines recommend checking a morning testosterone level as part of an ED workup. Low testosterone mostly lowers desire, and it can blunt the response to PDE5 inhibitors. Testosterone guide →
• Medications, sleep, and mood matter. Some blood pressure drugs, antidepressants, untreated sleep apnea, depression, and anxiety can all contribute. Sleep apnea → Mental health →

That's why a real evaluation is worth more than a pill alone. A good clinician will ask about your heart, medications, and other symptoms, not just write a prescription.

When the pills don't seem to work

PDE5 inhibitors help most men with ED, though they work less often after prostate surgery and in men with long-standing diabetes. Before deciding one has failed, the usual culprits are worth ruling out with your prescriber:

• No arousal. Taking the pill and waiting doesn't work. Stimulation is required.
• Wrong timing. Too soon after the dose, or (for the short-acting drugs) too long after.
• A heavy, high-fat meal. It can delay sildenafil and vardenafil tablets.
• Too few tries or too low a dose. Clinicians often suggest several attempts at an adequate dose before switching.
• Alcohol. Heavy drinking works against erections on its own.
• Fake or under-dosed pills from unverified sellers. How to spot them →

Other treatments

Pills are the usual first step, but not the only one. Guidelines from the American Urological Association treat these as options a man can choose among, depending on his health and preferences:

• Lifestyle changes. More exercise, weight loss, quitting smoking, and treating blood pressure, diabetes, and sleep apnea can improve erections, sometimes enough to need less medication. Fitness & recovery →
• Counseling or sex therapy. Useful when anxiety, relationship stress, or performance worries are part of the picture, and often combined with medication.
• Penile injections. Alprostadil (Caverject, Edex) or compounded mixes, injected with a very fine needle. They work for many men who don't respond to pills.
• Urethral suppository. Alprostadil inserted into the urethra (MUSE). Less effective than injections, but needle-free.
• Vacuum erection devices. A pump and a constriction ring. No medication, and inexpensive over time.
• Penile implants. A surgical option with high satisfaction rates, usually for men for whom other options haven't worked.
• Shockwave therapy. Low-intensity shockwave treatment is widely marketed by clinics, but the evidence is still limited and guidelines consider it investigational. Be wary of expensive packages that promise a cure.

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