What it is used for
- Treating erectile dysfunction in adult men
- Helping achieve an erection firm enough for sex when sexually aroused
How it is used
- Use it only as prescribed by your doctor; your doctor decides the dose.
- Swallow the tablet whole with water a short time before sexual activity, as the leaflet explains, with or without food.
- Do not take more than the prescribed dose in one day.
Possible side effects
- Headache and flushing
- Stuffy nose
- Back pain or dizziness
Who should not use it
- Do not use it if you take nitrate medicines for angina (such as nitroglycerin) or riociguat
- Do not use it if your doctor has advised you to avoid sexual activity because of heart disease, or after a recent heart attack or stroke
- Do not use it if you have lost sight in an eye because of a blood-flow problem in the optic nerve
- Do not use it if you are allergic to the active ingredient or any other ingredient in the product
Before and while using it
- Get medical help immediately if an erection lasts a long time or is painful.
- Stop it and get help immediately if you suddenly lose vision or hearing.
- Tell your doctor if you have heart disease, low blood pressure, uncontrolled high blood pressure, or liver or kidney disease.
- If you get chest pain during sexual activity, stop and get medical help, and do not take nitrates.
Medicine interactions
- Nitrates and riociguat can cause a dangerous drop in blood pressure and must not be used with it.
- Alpha-blockers for the prostate or blood pressure (such as doxazosin and tamsulosin) can lower blood pressure further.
- Some antifungals, antibiotics and HIV medicines (such as ketoconazole, clarithromycin and ritonavir) raise its level in the blood.
- Heavy drinking or grapefruit juice can increase side effects.
Pregnancy and breastfeeding
- This medicine is for men and is not used by women.
How to store it
- Store at room temperature away from heat and moisture, out of the sight and reach of children.
Get medical help straight away if
- Your face, lips or tongue swell, or you find it hard to breathe.
- You get a severe rash, blistering or peeling skin.
- A side effect worries you or doesn’t go away: contact your doctor or pharmacist.
Questions about this medicine?
Talk to a doctor by video, or send your question by text.
Source: Standard international medicine references
This guide is general information and doesn’t replace advice from your doctor or pharmacist. Don’t start, stop or change a medicine without asking them, and always read the leaflet in the pack.