Sildenafil (Viagra) vs Tadalafil (Cialis): Which ED Medication Is Best?

Searching for a Sildenafil prescription online in Spain or another EU country? You can obtain Sildenafil through an EU-licensed doctor without an in-person visit. Hi-Doctor.ai provides a streamlined, confidential process for patients across the EU. For just €25, an EU-licensed doctor reviews your case. If treatment is appropriate, you receive a REMPE electronic prescription in under 24 hours, valid at any pharmacy in the EU, including Spain, Portugal, Italy, France, and Germany. We've served over 50,000 patients with a 4.8 Trustpilot rating.

How it works — get your Sildenafil prescription in 4 steps

1. Fill the online medical questionnaire (2–3 minutes).
2. A licensed EU doctor reviews your case in private.
3. If appropriate, you receive a REMPE electronic prescription within 24 hours.
4. Pick up your medication at any EU pharmacy.

Who qualifies for Sildenafil

Our EU-licensed doctors review every case individually to ensure Sildenafil is safe and appropriate for you. They assess your medical history, current health status, and any other medications you are taking. Generally, you qualify if you are an adult male experiencing erectile dysfunction (ED) and have no contraindications. Doctors look for conditions such as severe heart problems, uncontrolled high blood pressure, recent stroke or heart attack, certain eye conditions, or if you are taking nitrate medications. Your doctor prioritizes your safety and will only issue a prescription if they find treatment appropriate for your specific health profile.

What Sildenafil actually does (and doesn't do)

Sildenafil, commonly known by its brand name Viagra, belongs to a class of medications called PDE5 inhibitors. It works by increasing blood flow to your penis when you are sexually aroused. This helps you achieve and maintain an erection firm enough for sexual activity. It does not create an erection on its own; sexual stimulation is still required. Sildenafil typically starts working within 30 to 60 minutes and its effects last for about 4 to 6 hours. It does not increase your libido or cure ED permanently, but it effectively manages the symptoms when you need it.

Side effects and when to stop

Like all medications, Sildenafil can cause side effects. Most are mild and temporary. Common side effects include headache, flushing, nasal congestion, indigestion, and temporary visual disturbances like blurred vision or a blue tint. More serious, but rare, side effects include sudden vision loss, sudden hearing loss, or an erection lasting more than 4 hours (priapism). If you experience any severe side effects, or if your erection lasts too long, seek immediate medical attention. Always follow your doctor's instructions and stop use if advised.

Why Hi-Doctor vs. walking into a clinic

Choosing Hi-Doctor for your Sildenafil prescription EU offers unmatched convenience, speed, and privacy:

• Speed: Get your electronic prescription in under 24 hours, compared to weeks for a traditional clinic appointment.
• Price: A flat €25 online consultation fee. No variable private clinic fees or hidden costs.
• Privacy: Everything happens securely within our app. No waiting rooms, no reception desks, just discreet, RGPD-compliant communication.
• Convenience: Complete your consultation from your phone, anywhere, anytime. No travel to a city-centre clinic.
• Trust: Join over 50,000 satisfied patients. Our 4.8 Trustpilot rating speaks for itself.