Sildenafil is a compound frequently searched online. Hi-Doctor focuses today on three areas — hair growth, weight management and sexual health — and Sildenafil is outside that scope. Our doctors cannot review it.

Will Hi-Doctor add Sildenafil in the future?

We expand the catalogue as new specialists join and as country-level regulation allows it. You can leave your email so we notify you if Sildenafil comes onto the platform.

What can I do in the meantime?

If your question fits one of our three areas (hair growth, weight management, sexual health), a licensed doctor reviews it in under 24 h for €25. If not, we recommend seeing an in-person specialist with experience in the specific indication.

Does Hi-Doctor recommend buying Sildenafil online?

No. Buying medication online without a valid prescription carries counterfeiting and toxicity risks. Any product requiring a prescription must come from a licensed pharmacy with a prescription issued by a licensed doctor.

Can I get a consultation for Sildenafil from Madrid?

Yes. Hi-Doctor runs 100 % online across the EU, so if you live in Madrid you can fill in the questionnaire and receive the medical review without travelling. The electronic prescription issued by the licensed doctor is valid in any EU pharmacy under Directive 2011/24/EU; in Spain it is dispensed directly from the prescription QR.

Is my sexual health consultation fully confidential?

Yes. All communication happens in the private chat of your account, GDPR-compliant. The doctor treats discretion as a core of the service and there is no history visible outside your consultation.

What is the private electronic prescription and why is it valid across the EU?

The private electronic prescription (Receta Médica Privada Electrónica) is issued by a licensed doctor in Spain. It is a PDF carrying every field required by EU Directive 2011/24/EU (patient, prescriber with country of registration, active ingredient, dose), which makes it legally recognised across all 27 EU member states. In Spanish pharmacies it is dispensed from the QR; outside Spain, the pharmacist dispenses the locally marketed equivalent of the same active ingredient.

How does Hi-Doctor work step by step?

1) Fill in an online medical questionnaire in about 4 minutes. 2) An EU-licensed doctor reviews your case and replies in under 24 h through the private chat in your account. 3) If eligible, the doctor issues an electronic prescription. 4) You collect it at any EU pharmacy. The consultation costs €25 and, if the doctor decides it is not safe to prescribe, the full amount is refunded.

How much does it cost and what does the price include?

The medical consultation costs €25 and includes a licensed doctor's review of your case and, if approved, the electronic prescription. If the doctor decides the treatment is not appropriate, the €25 is refunded. The medication price is separate and paid at the pharmacy; it varies by country, pharmacy and product across the EU. Because your electronic prescription is valid at any EU pharmacy, you can compare and choose where to fill it.

SildenafilSolo su prescrizione

Consulto medico online per Sildenafil.

Un medico autorizzato dall'UE esamina il Suo caso e, se idoneo, rilascia una prescrizione elettronica valida in qualsiasi farmacia dell'UE ai sensi della direttiva 2011/24/UE.

Onset in 30–60 minutes
Effect window of ~4–6 hours
The best-known, most-studied PDE5

25 €Rimborso se non approvato

Inizia consulto · €25 Scopri come funziona

Il farmaco, se prescritto, viene dispensato e pagato separatamente in farmacia.

FormaOral tablet

FrequenzaOn demand

RisultatiActs in 30–60 minutes

StatoSolo su prescrizione

Sul trattamento

Che cos'è Sildenafil?

Principio attivo: Sildenafil · Dosaggi: 25 / 50 / 100 mg on demand

Sildenafil is a phosphodiesterase-5 (PDE5) inhibitor. It relaxes smooth muscle in the penile blood vessels, facilitating an erection in response to sexual stimulation — it does not cause spontaneous erections or change desire.

It's taken on demand, 30 to 60 minutes before sexual activity; high-fat meals can delay onset. The doctor prescribes the appropriate dose after reviewing your cardiovascular health, current medication and contraindications.

Come agisce nel corpo

By inhibiting the PDE5 enzyme, sildenafil improves blood flow to the penis when there is sexual stimulation. Its effect starts within 30–60 minutes and lasts around 4–6 hours.

Come aiuta

How it helps.

Works on demand

Taken 30–60 minutes before sex — no daily routine required.

Adjustable dose

25, 50 or 100 mg — the doctor prescribes what fits your case and tolerance.

Doctor-screened

Cardiovascular health and interactions are reviewed before any prescription.

Cosa aspettarsi

How to take it.

On demand, before sexual activity. The doctor sets your dose and reviews it with you if the response or tolerance isn't right.

Take it 30–60 minutes before sexual activity
Avoid heavy, high-fat meals right before — they delay onset
Never combine with nitrates
Message your doctor to adjust the dose if needed

Doses your doctor can prescribe

Available doses25 / 50 / 100 mg
When30–60 min before activity
Pharmacy price~€18–35 / pack

Il Suo piano è personale

Questi passaggi sono solo indicativi. Il medico adatta il piano alla Sua risposta e tolleranza — e può scrivergli in qualsiasi momento.

Sicurezza prima di tutto

La sicurezza, per intero.

Sildenafil è un farmaco efficace — e, come ogni farmaco, comporta dei rischi. Il medico verifica tutto questo prima di prescrivere. Ecco il quadro onesto, non solo una rassicurazione.

Prescritto per uomini adulti con disfunzione erettile. Assunto circa 30-60 minuti prima dell'attività sessuale.

La dose iniziale standard è di 50 mg assunta su richiesta, non più di una volta al giorno.
L'effetto dura fino a 4 ore; la stimolazione sessuale è comunque necessaria affinché il farmaco funzioni.
Un pasto pesante o grasso può ritardare l'insorgenza: assumerlo a stomaco più leggero offre una risposta più prevedibile.

Chi non deve assumerlo

Assume qualsiasi medicinale a base di nitrati (per dolore toracico/angina) o droghe ricreative a base di amil-nitrito (“popper”) — la combinazione può causare cali di pressione sanguigna potenzialmente letali.
Assume riociguat (per l'ipertensione polmonare) o qualsiasi altro stimolatore della guanilato ciclasi.
Recente attacco cardiaco, ictus o angina instabile negli ultimi 6 mesi.
Grave compromissione epatica, grave ipotensione o disturbi retinici degenerativi ereditari noti.
Ha mai avuto una neuropatia ottica ischemica anteriore non arteritica (NAION).

Quando cercare assistenza urgente

In caso di sintomi gravi, improvvisi o inattesi, chiami il numero di emergenza locale o si rechi al pronto soccorso più vicino. Poi informi il medico tramite la chat del Suo account.

Leggi il riepilogo completo sulla sicurezza di Sildenafil

PREZZI

Un prezzo. Nessuna sorpresa.

25 € per consulto medico online. Se il medico non approva il trattamento, Le rimborsiamo l'intero importo entro 48 ore.

CONSULTO SINGOLO

Più popolare

25 €

Un consulto, un medico, una decisione.

Inizia consulto

COSA È INCLUSO

Esaminato da un medico con licenza UE
Risposta in meno di 24 ore
Ricetta elettronica valida in tutta l'UE (se appropriato)
Domande di follow-up illimitate nella chat del Suo account privato

Garanzia di rimborso Rimborso completo se il medico non approva il trattamento.

Recensioni

Cosa dicono i nostri pazienti.

Recensioni verificate di pazienti Hi-Doctor · nomi modificati per privacy · i risultati individuali variano.

Discreet from start to finish. The questionnaire was thorough and the doctor adjusted my dose after feedback.

Daniel P.

3 months in treatment

They checked my heart medication before prescribing — that level of care is why I stayed.

Sergio L.

7 months in treatment

Asking questions through the private chat was easy, and the answers came from the actual doctor.

Andreas W.

4 months in treatment

DOMANDE FREQUENTI

Domande su Sildenafil.

Scopra se fa per Lei

Verifichi se Sildenafil è appropriato per Lei.

Risponda ad alcune domande e un medico autorizzato dall'UE esaminerà il Suo caso entro 24 ore. Rimborso completo se non fa per Lei.

Inizia consulto · €25 Vedi Salute sessuale

ALTRI TRATTAMENTI SALUTE SESSUALE

Esplora i trattamenti correlati.

Viagrasildenafil Tadalafil Cialistadalafil Vardenafil Levitravardenafil Avanafil Spedraavanafil Stendraavanafil

Sildenafil is a selective PDE-5 inhibitor EMA-approved for erectile dysfunction in adult men.

PDE-5 inhibitorOral tablet · on-demand actionEMA-approvedPrescription-only

WHAT IT IS

Selective phosphodiesterase-5 inhibitor.

Sildenafil is the active ingredient in Viagra and many generics authorised in the EU. It belongs to the PDE-5 inhibitor family alongside tadalafil, vardenafil and avanafil. Each molecule differs in onset, duration and selectivity over secondary receptors.

Its effect is facilitatory, not inductive: it requires sexual stimulation to produce a response — it does not cause an erection on its own.

HOW IT WORKS

Cavernosal vasodilation via nitric oxide.

During sexual stimulation, the nervous system releases nitric oxide in erectile tissue. Nitric oxide activates guanylate cyclase, raising cGMP levels and relaxing the smooth muscle of penile arteries, increasing blood flow.

Sildenafil blocks PDE-5, the enzyme that degrades cGMP. By inhibiting it, cGMP stays elevated longer and the erectile response is prolonged.

Onset of action is 30–60 minutes after intake; duration is 4–6 hours. Absorption is slowed by fatty meals.

WHO IS A CANDIDATE

Indication and ruling out cardiovascular causes.

The EMA indication is for adult men with erectile dysfunction. The licensed doctor reviews your cardiovascular history, current medication and risk factors. Erectile dysfunction is often an early marker of subclinical cardiovascular disease — ruling that out is part of the evaluation.

It is contraindicated with nitrates (severe hypotension risk), riociguat and specific antiretroviral combinations. The questionnaire is designed to flag these cases.

WHAT TO EXPECT

On-demand dosing and tolerance.

Sildenafil is taken on demand, about an hour before planned sexual activity. The standard starting dose is 50 mg, adjustable to 25 or 100 mg based on response and tolerance. It should not be taken more than once a day.

In studies, satisfactory clinical response exceeds 70 % in adequately selected patients — the outcome depends on the underlying cause, the dose, and concurrent cardiovascular factors.

SAFETY

Side effects, contraindications and interactions.

The most common side effects are headache, facial flushing, nasal congestion, dyspepsia and transient visual changes (light sensitivity, blue-tinged perception).

Absolute contraindications include concomitant nitrates (nitroglycerin, isosorbide), a history of NAION (non-arteritic anterior ischaemic optic neuropathy) and specific riociguat combinations. The doctor reviews the full questionnaire before prescribing.

Seek emergency care if you experience chest pain, priapism (erection > 4 h) or sudden vision loss.

REVIEWED BY HI-DOCTOR LICENSED PHYSICIANS · EDUCATIONAL CONTENT, NOT A SUBSTITUTE FOR A CONSULTATION

DISPONIBILE ANCHE A

Il consulto per Sildenafil funziona allo stesso modo in tutta l'UE.

DISPONIBILE IN TUTTA LA SPAGNA