PDE5 Inhibitors: Understanding How ED Medications Work

Looking for an online prescription for ED medication like sildenafil (Viagra) or tadalafil (Cialis) in the EU? You've come to the right place. Hi-Doctor connects you with EU-licensed doctors who can review your case and, if appropriate, issue a digital prescription for PDE5 inhibitors. The process is fast, private, and costs just €25. You receive your prescription in under 24 hours, valid at any pharmacy across the EU.

How it works — get your ED medication prescription in 4 steps

1. Complete your medical questionnaire: Spend 2–3 minutes filling out our secure online form and pay the €25 consultation fee.
2. Doctor review & refund guarantee: An EU-licensed doctor individually reviews your health information. If the doctor determines the treatment is NOT appropriate for you, your €25 fee is automatically refunded. No risk involved.
3. Receive your prescription: If approved, you get a REMPE electronic prescription (PDF file) sent directly to your Hi-Doctor account and by email within 24 hours.
4. Collect your medication: Print the PDF or show it on your phone at any pharmacy in the EU. The REMPE prescription is issued under the Spanish system but is recognised EU-wide under cross-border prescription directive 2011/24/EU.

Who qualifies for ED medication (PDE5 inhibitors)

When you complete your online consultation, our EU-licensed doctors look for several factors to determine if PDE5 inhibitors are safe and appropriate for you. Generally, these medications are for adult men experiencing erectile dysfunction. Key considerations include:

• Your medical history: Conditions like severe heart disease, uncontrolled high or low blood pressure, recent stroke or heart attack, and certain eye conditions (e.g., NAION) can be contraindications.
• Current medications: PDE5 inhibitors interact dangerously with nitrates (often prescribed for chest pain) and can interact with alpha-blockers, certain antifungals, and antibiotics. Always disclose all your current medications.
• Overall health: Liver or kidney problems may require dosage adjustments or make these medications unsuitable.

The doctor's review ensures your safety and the effectiveness of the treatment.

What PDE5 inhibitors actually do (and don't do)

PDE5 inhibitors are a class of medications, including sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra), used to treat erectile dysfunction (ED). They work by increasing blood flow to the penis when you are sexually stimulated. Here's how:

• Enhance natural process: During sexual arousal, your body releases nitric oxide, which leads to the production of cGMP. cGMP relaxes the smooth muscles in the penis, allowing blood to flow in and create an erection.
• Block cGMP breakdown: The PDE5 enzyme normally breaks down cGMP. PDE5 inhibitors block this enzyme, keeping cGMP levels elevated. This prolongs muscle relaxation and maintains increased blood flow, making it easier to achieve and sustain an erection.

What they don't do: PDE5 inhibitors do not cause an erection on their own. Sexual stimulation is still required for them to work. They also do not treat the underlying cause of ED, nor do they increase sexual desire.

Side effects and when to stop

Like all medications, PDE5 inhibitors can cause side effects. Most are mild and temporary:

• Headache
• Flushing (redness in face/neck)
• Nasal congestion
• Indigestion or heartburn
• Visual disturbances (e.g., blurred vision, sensitivity to light, a blue tinge to vision for sildenafil)

When to seek immediate medical attention:

• An erection lasting more than 4 hours (priapism).
• Sudden vision loss in one or both eyes.
• Sudden decrease or loss of hearing.
• Chest pain or severe dizziness.

Always inform your doctor about your complete medical history and all medications you are taking to ensure PDE5 inhibitors are safe for you and to minimise risks.

Why Hi-Doctor vs. walking into a clinic

Choosing Hi-Doctor for your ED medication prescription offers significant advantages over traditional in-person clinic visits:

• Speed: Get your prescription in under 24 hours with Hi-Doctor, compared to waiting weeks for a clinic appointment.
• Price: A flat €25 online consultation fee with Hi-Doctor, against variable and often higher private clinic fees. Plus, if the doctor says no, you get your money back.
• Privacy: Everything happens securely within your Hi-Doctor account via RGPD-compliant chat. No awkward waiting room encounters or reception desk conversations.
• Convenience: Access an EU-licensed doctor from your phone or computer, anywhere in the EU. No travel, no time off work.
• Trust: Join 50,000+ satisfied patients with our 4.8 Trustpilot rating.

Frequently asked questions

What happens if the doctor decides I'm not a candidate for the medication?

If our EU-licensed doctor determines that PDE5 inhibitors are not appropriate or safe for you, your €25 consultation fee is refunded automatically. You pay nothing if the treatment isn't approved.

Is the REMPE prescription valid outside Spain?

Yes, absolutely. REMPE is Spain's official private electronic prescription standard. Under EU Directive 2011/24/EU, any pharmacy in the EU (including France, Germany, Italy, Portugal, Netherlands, Belgium, Austria, Ireland, etc.) is legally obliged to dispense medication from it. You receive a downloadable PDF you can print or show on your phone.

How do I actually collect the medication once I have the prescription?

Once you receive your REMPE prescription as a PDF, simply print it out or display it on your smartphone at any EU pharmacy counter. The pharmacist will scan the QR code or verify the digital signature and dispense your medication.

Is it legal to get ED medication online in my country via Hi-Doctor?

Yes, it is legal. Hi-Doctor operates with EU-licensed doctors who issue valid REMPE prescriptions recognised across all EU member states under the cross-border healthcare directive. This ensures your prescription is legitimate and accepted in your country.

How long does it take to get the prescription?

Our EU-licensed doctors review your case and issue the REMPE electronic prescription within 24 hours of completing your medical questionnaire and payment, if treatment is deemed appropriate.

Is my data private?

Yes. Hi-Doctor is fully RGPD-compliant. All your medical information and personal data are handled with the highest level of privacy and security within your private in-app account. There are no WhatsApp or SMS communications.

How much does the online consultation cost?

The online consultation with an EU-licensed doctor costs a flat €25. This fee covers the doctor's review of your case and the issuance of a prescription if appropriate. If the doctor determines the treatment is not suitable for you, this fee is fully refunded.