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Sexual health6 minute read

Erectile Dysfunction Medication: When NOT to Use Them

Written by Hi Doctor editorial teamPublished 1 February 2026

Considering erectile dysfunction medication online in the EU? Understand when it's NOT safe to use them and how our EU-licensed doctors can help you get a prescription safely, fast, and for €25.

Erectile Dysfunction Medication: When NOT to Use Them —
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DIRECT ANSWER

An online consultation lets an EU-licensed doctor review your case and, if appropriate, issue an electronic prescription; each pharmacy decides whether it can dispense it.

Doctor reply in under 2 hours

Average doctor reply under 2 hours; at night and on public holidays it can take longer, always within 24 hours. A prescription only if appropriate.

EU-licensed doctors

Every case is reviewed by an EU-licensed doctor.

Electronic prescription

Each pharmacy decides whether it can dispense an approved prescription; some do not accept PDF prescriptions.

Erectile Dysfunction Medication: When NOT to Use Them

If you're looking for an erectile dysfunction medication prescription online in the EU, you've come to the right place. While highly effective for many, these medications are not for everyone. An EU-licensed doctor will review your case to ensure your safety. Here's how you can get your prescription for €25, issued in under 24 hours, and valid at any pharmacy across the EU — with no risk.

How it works: get your erectile dysfunction medication prescription in 4 steps

  1. Fill out the online medical questionnaire (2–3 minutes) and pay the €35 consultation fee.
  2. A licensed EU doctor privately reviews your case. If the doctor determines the treatment is not appropriate, your €35 is refunded automatically — no risk, you pay nothing.
  3. If approved, you receive a valid electronic prescription (PDF file) in your Hi-Doctor account and by email within 24 hours.
  4. Print the PDF or show it on your phone and present it at any pharmacy in the EU to collect the medication.

Who qualifies for erectile dysfunction medication

Our EU-licensed doctors carefully assess each patient's medical history to ensure the safe and appropriate use of erectile dysfunction medications like sildenafil (Viagra) and tadalafil (Cialis). Here's what the doctor looks for in your case:

Heart Conditions and Blood Pressure

You may not qualify if you have:

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  • Unstable angina or severe heart failure.
  • Experienced a heart attack within the last six months.
  • Uncontrolled high blood pressure or very low blood pressure (hypotension).
  • Certain heart valve problems.

These medications can affect blood flow and blood pressure, so a thorough cardiac review is essential.

Medication Interactions

It's crucial to disclose all medications you are taking, especially:

  • Nitrates: Medications for chest pain (angina), such as nitroglycerin, isosorbide dinitrate, or isosorbide mononitrate. Combining these with ED drugs can cause a dangerous drop in blood pressure.
  • Alpha-blockers: Used for high blood pressure or prostate enlargement.
  • Certain antifungals or antibiotics: Like ketoconazole, itraconazole, erythromycin, or clarithromycin.
  • HIV protease inhibitors.

Other Considerations

You should also discuss any history of:

  • Severe liver or kidney problems.
  • Vision problems, particularly conditions like retinitis pigmentosa.
  • Any history of priapism (prolonged erection) or conditions that predispose you to it (e.g., sickle cell anemia, multiple myeloma, leukemia).

Honest and complete information helps our doctors make the safest decision for your health.

What erectile dysfunction medication actually does (and doesn't do)

Erectile dysfunction medications, primarily PDE5 inhibitors like sildenafil and tadalafil, work by relaxing the blood vessels in the penis. This increases blood flow, making it easier to achieve and maintain an erection when sexually aroused. They do not cause an erection automatically; sexual stimulation is still required.

These medications are highly effective for many men, with most experiencing improved erectile function within 30-60 minutes for sildenafil, and a longer window for tadalafil. They do not cure the underlying cause of ED, but rather treat the symptoms. For ongoing effectiveness, you will need to continue taking them as prescribed.

Side effects and when to stop

Like all medications, ED drugs can have side effects. Common ones include headache, flushing, indigestion, nasal congestion, and dizziness. These are usually mild and temporary. However, certain side effects require immediate medical attention:

  • An erection lasting more than 4 hours (priapism).
  • Sudden decrease or loss of vision.
  • Sudden decrease or loss of hearing.
  • Symptoms of a heart attack (chest pain, shortness of breath, nausea).

If you experience any severe or concerning side effects, stop taking the medication and seek medical help immediately. Your Hi-Doctor EU-licensed physician is available via private chat within your account to address any concerns.

Why Hi-Doctor vs. walking into a clinic

Hi-Doctor offers a modern, patient-focused approach to getting your erectile dysfunction medication prescription:

  • Speed: Get your prescription in under 24 hours, compared to weeks for a traditional clinic appointment.
  • Price: A flat €35 online consultation fee, regardless of outcome. No hidden costs, unlike variable private clinic fees.
  • Privacy: Everything happens in your secure, RGPD-compliant Hi-Doctor account. No waiting rooms, no awkward conversations at a reception desk.
  • Convenience: Access an EU-licensed doctor from your phone or computer, anywhere, anytime. No travel to a city-centre clinic.
  • Trust: Join over 50,000 patients served with a 4.8 Trustpilot rating. Our EU-licensed doctors review every case individually.

Your interest guides which specialists we add next.

If your treatment isn't yet among Hi-Doctor's covered specialties, register at hi-doctor.ai so a doctor can notify you the moment we can handle your case. Our EU-licensed doctors issue electronic prescriptions as a PDF valid at any EU pharmacy, and if the doctor decides the treatment isn't appropriate, the €35 consultation fee is refunded automatically.

Register my interest · €35

COMMON QUESTIONS

Frequently asked questions

If the EU-licensed doctor determines that erectile dysfunction medication is not appropriate for you, your €35 consultation fee is refunded automatically. You pay nothing if treatment isn't approved – it's completely risk-free.

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Written by the Hi Doctor editorial team. General information, not individually reviewed by a doctor.

If the doctor does not approve treatment, we refund the full amount. Every consultation is fully refundable. How refunds work