Prescribed for adult men with erectile dysfunction. Taken about 30–60 minutes before sexual activity.
- Standard starting dose is 50 mg taken on demand, no more than once per day.
- Effect lasts up to 4 hours; sexual stimulation is still required for the medicine to work.
- A heavy or fatty meal can delay onset — taking it on a lighter stomach gives a more predictable response.
Rare but require immediate medical attention.
- Erection lasting more than 4 hours (priapism) — go to A&E to avoid permanent tissue damage.
- Sudden loss or decrease in vision in one or both eyes.
- Sudden hearing loss or ringing in the ears.
- Chest pain during or shortly after sexual activity — call emergency services.
- Severe allergic reaction (rash, swelling, difficulty breathing).
WHEN TO CALL THE DOCTOR
Call us through the in-app chat if you notice…
- Side effects that don't settle after a few hours, or that affect daily life.
- An erection that won't go down, sudden vision or hearing changes — these are A&E events first, then message us.
- A new medication or recreational substance you've started since your consultation.
OFFICIAL SOURCE
This summary is condensed from the regulator's full product leaflet for ease of reading. The complete document — every interaction, dose adjustment and reporting note — is one click away.
This page summarises information from the regulator-approved leaflet for reference only. It is not medical advice and does not replace the assessment of an EU-licensed doctor. Your doctor will review your individual history, dose and interactions during your consultation.
← Back to consultationYou can print this page for your records.