Erectile Dysfunction Guide: Causes, Tests & Treatment Choices

When to seek urgent help

• An erection lasting more than four hours: seek emergency assessment, even if a medicine or injection caused it. Do not wait for a routine appointment.
• Chest pain, collapse or severe breathlessness: call local emergency services. Tell the emergency team if you have taken an erection medicine, including which one and when; this affects safe treatment.
• Sudden vision or hearing loss after an erection medicine: get urgent medical advice. Do not take another dose while waiting for advice.

Prescription PDE5 inhibitors such as sildenafil must not be combined with nitrate medicines, including nitroglycerin/GTN or isosorbide, or recreational nitrites (“poppers”). Dangerous blood-pressure falls can occur. Do not stop a prescribed heart medicine to make an ED medicine possible; ask the treating clinician to coordinate care. [1] [5]

Separate erections, desire and ejaculation

An erection is not the same as sexual desire, orgasm, ejaculation or fertility. You may want sex but have trouble maintaining firmness; alternatively, desire may be low while erections remain possible. Pain, curvature, early ejaculation or difficulty reaching orgasm may need their own assessment. Naming the main difficulty prevents a treatment aimed at the wrong outcome. [1] [2]

Try a brief, nonjudgmental record: when it happens, firmness, whether the erection lasts, desire, discomfort and the impact on you or a partner. A validated questionnaire can help track severity and change, but an online score cannot diagnose blocked arteries or authorize a prescription. [1]

If the main change is interest rather than firmness, start with the low libido guide. For conception concerns, use the male fertility guide; an erection response does not measure sperm production.

Possible causes—and the cardiovascular connection

Diabetes, cardiovascular disease and related risk factors can affect the blood supply needed for an erection. Nerve injury, pelvic surgery, some medicines and hormonal disorders may also contribute. Anxiety, depression, relationship strain and pressure to “perform” can be causes, consequences or both. Mixed causes are common enough that “all in your head” versus “entirely physical” is an unhelpful starting assumption. [1] [2]

The AUA describes ED as a risk marker for underlying cardiovascular disease and other health conditions. A marker is a reason to review risk—not proof of a narrowed coronary artery and not a reason for everyone to order a scan. Discuss blood pressure, diabetes risk, smoking, lipid assessment when indicated and whether sexual activity or exercise needs medical guidance. [1]

Bring a complete medicine list, including nonprescription sleep aids, supplements and recreational substances. If symptoms started after a prescription changed, ask whether there is a safe alternative. Stopping blood-pressure or mental-health treatment without advice can create more harm than the sexual side effect itself. [1] [2]

What a useful clinical assessment includes

A good assessment begins with medical, sexual and psychosocial history, an appropriate physical examination and selective laboratory testing. It should ask about your goals, not just whether penetration is possible. Privacy and, when appropriate and wanted, involving a partner can make the discussion more useful. [1]

The AUA ED guideline recommends a morning total testosterone measurement in men with ED. This is different from screening every symptom-free man for low testosterone. If a result is low, diagnosis still requires appropriate confirmation and interpretation; one number is not a self-prescribing threshold. Other tests depend on the history and clinical findings. [1]

Specialist vascular testing is not a compulsory first step for everyone. Ask what a proposed test would change: choice of treatment, safety advice or a decision about surgery. A large commercial “men’s panel” is not automatically more informative than a focused assessment. [1]

For the hormone pathway, read the low testosterone guide. If urinary symptoms are also present, discuss them rather than assuming that one prostate or testosterone product addresses both problems.

Prescription tablets: use correctly before calling them a failure

PDE5 inhibitors support the erection response; sexual stimulation is still needed. They do not automatically increase desire and are not testosterone replacement. Choice depends on medical suitability, desired timing, other medicines, cost and tolerability. Follow the specific prescription and patient leaflet rather than mixing tablets or copying an online dose. [1] [5]

If a tablet seems ineffective, review how it was used before moving to injections or a procedure. Was the timing appropriate for that medicine? Could a meal matter? Was there stimulation? Were side effects limiting use? Was the product obtained from a legitimate pharmacy? A clinician may adjust the approach, but repeated extra doses are not a safe troubleshooting method. [1] [5]

Common adverse effects and individual interactions deserve discussion. Nitrates are a major contraindication; other blood-pressure-lowering treatments also require review. A person taking a urinary-symptom medicine should tell the prescriber before adding an ED tablet. This guide deliberately provides no starting dose or combination schedule. [1] [5]

Daily tadalafil is not automatically “stronger” than on-demand tadalafil. The Canadian guideline’s review found no clinically important average advantage in erectile-function scores for daily dosing over on-demand dosing in the included trials. Preference and suitability can still make one schedule more convenient. Average trial scores cannot choose your regimen. [3]

When urinary medicines and erection medicines overlap, bring both prescriptions to the review. The prostate and urinary symptoms guide explains the separate assessment; do not assume that one medicine is suitable for both concerns.

What exercise and psychological support can—and cannot—do

An aerobic-exercise meta-analysis pooled 11 randomized trials involving 1,147 men. Exercise improved the erectile-function domain of the International Index of Erectile Function by an average 2.8 points versus controls (95% confidence interval 1.7–3.9). The studies varied, with moderate statistical heterogeneity (I² 53%). This is evidence of an average benefit, not a guaranteed cure or proof of equivalence to a prescription drug. [4]

The review was funded by Boston Scientific, which was involved in study design, interpretation, manuscript review and the decision to submit. Author financial relationships were disclosed. That does not make the result unusable, but it belongs alongside the modest average effect and differences between trials when judging the finding. [4]

Build activity around current health and capacity. Address smoking, sleep problems and relevant metabolic conditions rather than treating sex as an isolated performance test. Counseling or psychosexual therapy may help reduce performance anxiety and improve communication; referral is not a declaration that symptoms are imaginary. [1] [2]

If a partner is involved, agree what satisfying intimacy means while treatment is being assessed. Measuring every encounter as pass or fail can add pressure. Emotional support can accompany medical treatment instead of competing with it. [1]

Devices, injections and surgery: ask about training and trade-offs

These are legitimate clinical options for selected people, not a sequence everyone must complete. Injection therapy needs training and an emergency plan, not a dose borrowed from another patient. Devices and implants can improve assisted function without reversing every underlying cause. [1]

Be especially careful with paid “regenerative” packages. The AUA’s 2018 guideline classifies low-intensity shockwave therapy and stem-cell treatment as investigational and platelet-rich plasma as experimental. This is an attributed guideline position, not a claim that no newer studies exist. Ask which exact technique, trial evidence and regulatory status support the proposed service, and whether durable patient-important benefits have been demonstrated. [1] [3]

ED options at a glance—not a treatment ranking

This summarizes the options discussed above; it does not show comparative success rates or prescribe an order of treatment. [1] [2] [5]

Testosterone and supplements are not interchangeable with ED care

Testosterone may be appropriate for confirmed hypogonadism in a suitable patient, but it is not a universal ED treatment. The Canadian guideline found that the average erectile-function benefit from testosterone alone in the reviewed trials was small and below its usual overall threshold for a clinically important change. Benefits for desire and benefits for erection firmness are not the same outcome. [3]

Before any hormone prescription, discuss fertility goals. Exogenous testosterone can suppress sperm production. Do not infer that an over-the-counter “testosterone booster” shares the evidence, ingredients or monitoring of prescribed therapy. The testosterone guide explains the separate diagnostic pathway.

FDA warnings identify sexual-enhancement products containing hidden drug ingredients. “Natural,” customer testimonials and absence from a warning list do not establish safety. Hidden PDE5-like ingredients are particularly concerning for someone using nitrates. Avoid combining a supplement with a prescription in the hope of a stronger effect. [6]

A practical follow-up plan

• Define the target: firmness, reliability, confidence, comfort or another outcome.
• Record tolerability and whether the medicine or device was used as instructed.
• Ask when to review, and what would trigger earlier review.
• Revisit new pain, curvature, reduced desire, medication changes or cardiovascular symptoms instead of only increasing treatment intensity.

If the first option fails, the next useful step is a structured review of diagnosis, instructions, safety and preferences. It is not proof that nothing works, and it is not a reason to buy an unregulated injectable product. An appointment note with three priorities is often more useful than a long supplement list. [1] [2]

How this guide was researched

Editorial update: October 19, 2026. Key guideline, public-health and safety statements were rechecked against the linked sources during this update. This remains an AI-assisted educational synthesis with no independent medical review; it is not an exhaustive literature search or individualized care.

This is an AI-assisted editorial synthesis, not an independent clinical review or a systematic review. We inspected the cited guideline recommendations, patient information and selected exercise-review sections. The main AUA ED guideline cited is from 2018; publication dates are shown so older recommendations are not presented as newly issued guidance. We did not conduct clinical testing, prescribe treatment or verify individual commercial products.

Sources checked October 18, 2026. Medical information can change. This is general education, not diagnosis or individualized treatment. For urgent symptoms use local emergency or urgent-care services.

Sources and evidence notes

1. American Urological Association: Erectile Dysfunction guideline (2018). Selected evaluation, medicine safety, device, injection and investigational-treatment recommendations inspected; not a newly issued 2026 guideline.
2. NIDDK: Erectile Dysfunction. Patient information on causes, assessment and treatment.
3. Canadian Urological Association guideline: Erectile dysfunction (2021). Open-access guideline; evidence interpretation and comparisons inspected.
4. Miller et al.: Effect of aerobic exercise on erectile function (2023). Systematic review/meta-analysis, 11 randomized trials; methods, results and funding sections inspected. DOI: 10.1093/jsxmed/qdad130.
5. NHS: Sildenafil (Viagra). Medicine overview and safety information; not a substitute for product-specific prescribing advice.
6. FDA: Sexual enhancement and energy product notifications. Regulator warnings about hidden drug ingredients; the list is not exhaustive.