Prescribed for adult men with erectile dysfunction in two regimens.
- On-demand: 10 mg taken at least 30 minutes before sexual activity. Adjustable to 20 mg or 5 mg by the doctor.
- Daily low-dose: 2.5 mg or 5 mg once a day for men with frequent activity or co-existing benign prostatic hyperplasia (BPH).
- Effect window of up to 36 hours from a single dose; food and alcohol have minimal impact compared with sildenafil.
- Erection lasting more than 4 hours (priapism) — A&E.
- Sudden vision loss in one or both eyes (NAION) — stop and seek care.
- Sudden hearing loss or tinnitus.
- Chest pain during or shortly after sex — call emergency services.
- Severe allergic reaction.
WHEN TO CALL THE DOCTOR
Call us through the in-app chat if you notice…
- Back or muscle pain that doesn't resolve within 48h or stops you from sleeping.
- A persistent erection, vision or hearing change — A&E first, then message us.
- Heart symptoms during sex (chest pressure, breathlessness, palpitations).
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.